span: move `MultiSpan`

`MultiSpan` contains labels, which are more complicated with the
introduction of diagnostic translation and will use types from
`rustc_errors` - however, `rustc_errors` depends on `rustc_span` so
`rustc_span` cannot use types like `DiagnosticMessage` without
dependency cycles. Introduce a new `rustc_error_messages` crate that can
contain `DiagnosticMessage` and `MultiSpan`.

Signed-off-by: David Wood <david.wood@huawei.com>

Cargo.lock

@@ -3645,6 +3645,15 @@ dependencies = [
 name = "rustc_error_codes"
 version = "0.0.0"
 
+[[package]]
+name = "rustc_error_messages"
+version = "0.0.0"
+dependencies = [
+ "rustc_macros",
+ "rustc_serialize",
+ "rustc_span",
+]
+
 [[package]]
 name = "rustc_errors"
 version = "0.0.0"
@@ -3652,6 +3661,7 @@ dependencies = [
  "annotate-snippets",
  "atty",
  "rustc_data_structures",
+ "rustc_error_messages",
  "rustc_lint_defs",
  "rustc_macros",
  "rustc_serialize",
@@ -3708,6 +3718,7 @@ dependencies = [
  "odht",
  "rustc_ast",
  "rustc_data_structures",
+ "rustc_error_messages",
  "rustc_feature",
  "rustc_index",
  "rustc_macros",
@@ -3864,6 +3875,7 @@ version = "0.0.0"
 dependencies = [
  "rustc_ast",
  "rustc_data_structures",
+ "rustc_error_messages",
  "rustc_hir",
  "rustc_macros",
  "rustc_serialize",

compiler/rustc_borrowck/src/borrowck_errors.rs

@@ -1,6 +1,6 @@
-use rustc_errors::{struct_span_err, DiagnosticBuilder, DiagnosticId, ErrorGuaranteed};
+use rustc_errors::{struct_span_err, DiagnosticBuilder, DiagnosticId, ErrorGuaranteed, MultiSpan};
 use rustc_middle::ty::{self, Ty, TyCtxt};
-use rustc_span::{MultiSpan, Span};
+use rustc_span::Span;
 
 impl<'cx, 'tcx> crate::MirBorrowckCtxt<'cx, 'tcx> {
     crate fn cannot_move_when_borrowed(

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -1,7 +1,7 @@
 use either::Either;
 use rustc_const_eval::util::CallKind;
 use rustc_data_structures::fx::FxHashSet;
-use rustc_errors::{Applicability, Diagnostic, DiagnosticBuilder, ErrorGuaranteed};
+use rustc_errors::{Applicability, Diagnostic, DiagnosticBuilder, ErrorGuaranteed, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_hir::{AsyncGeneratorKind, GeneratorKind};
@@ -15,7 +15,7 @@ use rustc_middle::mir::{
 use rustc_middle::ty::{self, subst::Subst, suggest_constraining_type_params, PredicateKind, Ty};
 use rustc_mir_dataflow::move_paths::{InitKind, MoveOutIndex, MovePathIndex};
 use rustc_span::symbol::sym;
-use rustc_span::{BytePos, MultiSpan, Span};
+use rustc_span::{BytePos, Span};
 use rustc_trait_selection::infer::InferCtxtExt;
 use rustc_trait_selection::traits::TraitEngineExt as _;
 

compiler/rustc_builtin_macros/src/format.rs

@@ -7,11 +7,11 @@ use rustc_ast::tokenstream::TokenStream;
 use rustc_ast::visit::{self, Visitor};
 use rustc_ast::{token, BlockCheckMode, UnsafeSource};
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
-use rustc_errors::{pluralize, Applicability, PResult};
+use rustc_errors::{pluralize, Applicability, MultiSpan, PResult};
 use rustc_expand::base::{self, *};
 use rustc_parse_format as parse;
 use rustc_span::symbol::{sym, Ident, Symbol};
-use rustc_span::{InnerSpan, MultiSpan, Span};
+use rustc_span::{InnerSpan, Span};
 use smallvec::SmallVec;
 
 use std::borrow::Cow;
@@ -446,7 +446,9 @@ impl<'a, 'b> Context<'a, 'b> {
                                 .iter()
                                 .filter(|fmt| fmt.precision_span.is_some())
                                 .count();
-                        e.span_label(span, &format!(
+                        e.span_label(
+                            span,
+                            &format!(
                             "this precision flag adds an extra required argument at position {}, \
                              which is why there {} expected",
                             pos,
@@ -455,7 +457,8 @@ impl<'a, 'b> Context<'a, 'b> {
                             } else {
                                 format!("are {} arguments", count)
                             },
-                        ));
+                        ),
+                        );
                         if let Some(arg) = self.args.get(pos) {
                             e.span_label(
                                 arg.span,

compiler/rustc_error_messages/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "rustc_error_messages"
+version = "0.0.0"
+edition = "2021"
+
+[lib]
+doctest = false
+
+[dependencies]
+rustc_serialize = { path = "../rustc_serialize" }
+rustc_span = { path = "../rustc_span" }
+rustc_macros = { path = "../rustc_macros" }

compiler/rustc_error_messages/src/lib.rs

@@ -0,0 +1,171 @@
+use rustc_macros::{Decodable, Encodable};
+use rustc_span::Span;
+
+/// Abstraction over a message in a diagnostic to support both translatable and non-translatable
+/// diagnostic messages.
+#[derive(Clone, Debug, PartialEq, Eq, Hash, Encodable, Decodable)]
+pub enum DiagnosticMessage {
+    /// Non-translatable diagnostic message.
+    Str(String),
+    /// Identifier for a Fluent message corresponding to the diagnostic message.
+    FluentIdentifier(String),
+}
+
+impl DiagnosticMessage {
+    /// Convert `DiagnosticMessage` to a `&str`.
+    pub fn as_str(&self) -> &str {
+        match self {
+            DiagnosticMessage::Str(msg) => msg,
+            DiagnosticMessage::FluentIdentifier(..) => unimplemented!(),
+        }
+    }
+
+    /// Convert `DiagnosticMessage` to an owned `String`.
+    pub fn to_string(self) -> String {
+        match self {
+            DiagnosticMessage::Str(msg) => msg,
+            DiagnosticMessage::FluentIdentifier(..) => unimplemented!(),
+        }
+    }
+}
+
+/// A span together with some additional data.
+#[derive(Clone, Debug)]
+pub struct SpanLabel {
+    /// The span we are going to include in the final snippet.
+    pub span: Span,
+
+    /// Is this a primary span? This is the "locus" of the message,
+    /// and is indicated with a `^^^^` underline, versus `----`.
+    pub is_primary: bool,
+
+    /// What label should we attach to this span (if any)?
+    pub label: Option<DiagnosticMessage>,
+}
+
+/// A collection of `Span`s.
+///
+/// Spans have two orthogonal attributes:
+///
+/// - They can be *primary spans*. In this case they are the locus of
+///   the error, and would be rendered with `^^^`.
+/// - They can have a *label*. In this case, the label is written next
+///   to the mark in the snippet when we render.
+#[derive(Clone, Debug, Hash, PartialEq, Eq, Encodable, Decodable)]
+pub struct MultiSpan {
+    primary_spans: Vec<Span>,
+    span_labels: Vec<(Span, DiagnosticMessage)>,
+}
+
+impl MultiSpan {
+    #[inline]
+    pub fn new() -> MultiSpan {
+        MultiSpan { primary_spans: vec![], span_labels: vec![] }
+    }
+
+    pub fn from_span(primary_span: Span) -> MultiSpan {
+        MultiSpan { primary_spans: vec![primary_span], span_labels: vec![] }
+    }
+
+    pub fn from_spans(mut vec: Vec<Span>) -> MultiSpan {
+        vec.sort();
+        MultiSpan { primary_spans: vec, span_labels: vec![] }
+    }
+
+    pub fn push_span_label(&mut self, span: Span, label: String) {
+        self.span_labels.push((span, DiagnosticMessage::Str(label)));
+    }
+
+    pub fn push_span_message(&mut self, span: Span, message: DiagnosticMessage) {
+        self.span_labels.push((span, message));
+    }
+
+    /// Selects the first primary span (if any).
+    pub fn primary_span(&self) -> Option<Span> {
+        self.primary_spans.first().cloned()
+    }
+
+    /// Returns all primary spans.
+    pub fn primary_spans(&self) -> &[Span] {
+        &self.primary_spans
+    }
+
+    /// Returns `true` if any of the primary spans are displayable.
+    pub fn has_primary_spans(&self) -> bool {
+        self.primary_spans.iter().any(|sp| !sp.is_dummy())
+    }
+
+    /// Returns `true` if this contains only a dummy primary span with any hygienic context.
+    pub fn is_dummy(&self) -> bool {
+        let mut is_dummy = true;
+        for span in &self.primary_spans {
+            if !span.is_dummy() {
+                is_dummy = false;
+            }
+        }
+        is_dummy
+    }
+
+    /// Replaces all occurrences of one Span with another. Used to move `Span`s in areas that don't
+    /// display well (like std macros). Returns whether replacements occurred.
+    pub fn replace(&mut self, before: Span, after: Span) -> bool {
+        let mut replacements_occurred = false;
+        for primary_span in &mut self.primary_spans {
+            if *primary_span == before {
+                *primary_span = after;
+                replacements_occurred = true;
+            }
+        }
+        for span_label in &mut self.span_labels {
+            if span_label.0 == before {
+                span_label.0 = after;
+                replacements_occurred = true;
+            }
+        }
+        replacements_occurred
+    }
+
+    /// Returns the strings to highlight. We always ensure that there
+    /// is an entry for each of the primary spans -- for each primary
+    /// span `P`, if there is at least one label with span `P`, we return
+    /// those labels (marked as primary). But otherwise we return
+    /// `SpanLabel` instances with empty labels.
+    pub fn span_labels(&self) -> Vec<SpanLabel> {
+        let is_primary = |span| self.primary_spans.contains(&span);
+
+        let mut span_labels = self
+            .span_labels
+            .iter()
+            .map(|&(span, ref label)| SpanLabel {
+                span,
+                is_primary: is_primary(span),
+                label: Some(label.clone()),
+            })
+            .collect::<Vec<_>>();
+
+        for &span in &self.primary_spans {
+            if !span_labels.iter().any(|sl| sl.span == span) {
+                span_labels.push(SpanLabel { span, is_primary: true, label: None });
+            }
+        }
+
+        span_labels
+    }
+
+    /// Returns `true` if any of the span labels is displayable.
+    pub fn has_span_labels(&self) -> bool {
+        self.span_labels.iter().any(|(sp, _)| !sp.is_dummy())
+    }
+}
+
+impl From<Span> for MultiSpan {
+    fn from(span: Span) -> MultiSpan {
+        MultiSpan::from_span(span)
+    }
+}
+
+impl From<Vec<Span>> for MultiSpan {
+    fn from(spans: Vec<Span>) -> MultiSpan {
+        MultiSpan::from_spans(spans)
+    }
+}

compiler/rustc_errors/Cargo.toml

@@ -8,6 +8,7 @@ doctest = false
 
 [dependencies]
 tracing = "0.1"
+rustc_error_messages = { path = "../rustc_error_messages" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_span = { path = "../rustc_span" }
 rustc_macros = { path = "../rustc_macros" }

compiler/rustc_errors/src/annotate_snippet_emitter_writer.rs

@@ -7,12 +7,12 @@
 
 use crate::emitter::FileWithAnnotatedLines;
 use crate::snippet::Line;
-use crate::{CodeSuggestion, Diagnostic, DiagnosticId, Emitter, Level, SubDiagnostic};
+use crate::{CodeSuggestion, Diagnostic, DiagnosticId, Emitter, Level, MultiSpan, SubDiagnostic};
 use annotate_snippets::display_list::{DisplayList, FormatOptions};
 use annotate_snippets::snippet::*;
 use rustc_data_structures::sync::Lrc;
 use rustc_span::source_map::SourceMap;
-use rustc_span::{MultiSpan, SourceFile};
+use rustc_span::SourceFile;
 
 /// Generates diagnostics using annotate-snippet
 pub struct AnnotateSnippetEmitterWriter {

compiler/rustc_errors/src/diagnostic.rs

@@ -1,15 +1,13 @@
 use crate::snippet::Style;
-use crate::CodeSuggestion;
-use crate::Level;
-use crate::Substitution;
-use crate::SubstitutionPart;
-use crate::SuggestionStyle;
-use crate::ToolMetadata;
+use crate::{
+    CodeSuggestion, DiagnosticMessage, Level, MultiSpan, Substitution, SubstitutionPart,
+    SuggestionStyle, ToolMetadata,
+};
 use rustc_data_structures::stable_map::FxHashMap;
 use rustc_lint_defs::{Applicability, LintExpectationId};
 use rustc_serialize::json::Json;
 use rustc_span::edition::LATEST_STABLE_EDITION;
-use rustc_span::{MultiSpan, Span, DUMMY_SP};
+use rustc_span::{Span, DUMMY_SP};
 use std::fmt;
 use std::hash::{Hash, Hasher};
 
@@ -18,34 +16,6 @@ use std::hash::{Hash, Hasher};
 #[derive(Clone, Debug, PartialEq, Eq, Hash, Encodable, Decodable)]
 pub struct SuggestionsDisabled;
 
-/// Abstraction over a message in a diagnostic to support both translatable and non-translatable
-/// diagnostic messages.
-#[derive(Clone, Debug, PartialEq, Eq, Hash, Encodable, Decodable)]
-pub enum DiagnosticMessage {
-    /// Non-translatable diagnostic message.
-    Str(String),
-    /// Identifier for a Fluent message corresponding to the diagnostic message.
-    FluentIdentifier(String),
-}
-
-impl DiagnosticMessage {
-    /// Convert `DiagnosticMessage` to a `&str`.
-    pub fn as_str(&self) -> &str {
-        match self {
-            DiagnosticMessage::Str(msg) => msg,
-            DiagnosticMessage::FluentIdentifier(..) => unimplemented!(),
-        }
-    }
-
-    /// Convert `DiagnosticMessage` to an owned `String`.
-    pub fn to_string(self) -> String {
-        match self {
-            DiagnosticMessage::Str(msg) => msg,
-            DiagnosticMessage::FluentIdentifier(..) => unimplemented!(),
-        }
-    }
-}
-
 #[must_use]
 #[derive(Clone, Debug, Encodable, Decodable)]
 pub struct Diagnostic {
@@ -262,7 +232,7 @@ impl Diagnostic {
         self.set_span(after);
         for span_label in before.span_labels() {
             if let Some(label) = span_label.label {
-                self.span_label(after, label);
+                self.span.push_span_message(after, label);
             }
         }
         self

compiler/rustc_errors/src/diagnostic_builder.rs

@@ -1,8 +1,8 @@
 use crate::{Diagnostic, DiagnosticId, DiagnosticStyledString, ErrorGuaranteed};
-use crate::{Handler, Level, StashKey};
+use crate::{Handler, Level, MultiSpan, StashKey};
 use rustc_lint_defs::Applicability;
 
-use rustc_span::{MultiSpan, Span};
+use rustc_span::Span;
 use std::fmt::{self, Debug};
 use std::marker::PhantomData;
 use std::ops::{Deref, DerefMut};

compiler/rustc_errors/src/emitter.rs

@@ -10,13 +10,13 @@
 use Destination::*;
 
 use rustc_span::source_map::SourceMap;
-use rustc_span::{MultiSpan, SourceFile, Span};
+use rustc_span::{SourceFile, Span};
 
 use crate::snippet::{Annotation, AnnotationType, Line, MultilineAnnotation, Style, StyledString};
 use crate::styled_buffer::StyledBuffer;
 use crate::{
-    CodeSuggestion, Diagnostic, DiagnosticId, DiagnosticMessage, Handler, Level, SubDiagnostic,
-    SubstitutionHighlight, SuggestionStyle,
+    CodeSuggestion, Diagnostic, DiagnosticId, DiagnosticMessage, Handler, Level, MultiSpan,
+    SubDiagnostic, SubstitutionHighlight, SuggestionStyle,
 };
 
 use rustc_lint_defs::pluralize;
@@ -2003,7 +2003,7 @@ impl FileWithAnnotatedLines {
                         start_col: lo.col_display,
                         end_col: hi.col_display,
                         is_primary: span_label.is_primary,
-                        label: span_label.label,
+                        label: span_label.label.map(|m| m.to_string()),
                         overlaps_exactly: false,
                     };
                     multiline_annotations.push((lo.file, ml));
@@ -2012,7 +2012,7 @@ impl FileWithAnnotatedLines {
                         start_col: lo.col_display,
                         end_col: hi.col_display,
                         is_primary: span_label.is_primary,
-                        label: span_label.label,
+                        label: span_label.label.map(|m| m.to_string()),
                         annotation_type: AnnotationType::Singleline,
                     };
                     add_annotation_to_file(&mut output, lo.file, lo.line, ann);

compiler/rustc_errors/src/json.rs

@@ -15,12 +15,12 @@ use crate::emitter::{Emitter, HumanReadableErrorType};
 use crate::registry::Registry;
 use crate::DiagnosticId;
 use crate::ToolMetadata;
-use crate::{CodeSuggestion, SubDiagnostic};
+use crate::{CodeSuggestion, MultiSpan, SpanLabel, SubDiagnostic};
 use rustc_lint_defs::Applicability;
 
 use rustc_data_structures::sync::Lrc;
 use rustc_span::hygiene::ExpnData;
-use rustc_span::{MultiSpan, Span, SpanLabel};
+use rustc_span::Span;
 use std::io::{self, Write};
 use std::path::Path;
 use std::sync::{Arc, Mutex};
@@ -423,7 +423,13 @@ impl DiagnosticSpan {
         suggestion: Option<(&String, Applicability)>,
         je: &JsonEmitter,
     ) -> DiagnosticSpan {
-        Self::from_span_etc(span.span, span.is_primary, span.label, suggestion, je)
+        Self::from_span_etc(
+            span.span,
+            span.is_primary,
+            span.label.map(|m| m.to_string()),
+            suggestion,
+            je,
+        )
     }
 
     fn from_span_etc(

compiler/rustc_errors/src/lib.rs

@@ -31,11 +31,12 @@ use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap};
 use rustc_data_structures::stable_hasher::StableHasher;
 use rustc_data_structures::sync::{self, Lock, Lrc};
 use rustc_data_structures::AtomicRef;
+pub use rustc_error_messages::{DiagnosticMessage, MultiSpan, SpanLabel};
 pub use rustc_lint_defs::{pluralize, Applicability};
 use rustc_serialize::json::Json;
 use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
 use rustc_span::source_map::SourceMap;
-use rustc_span::{Loc, MultiSpan, Span};
+use rustc_span::{Loc, Span};
 
 use std::borrow::Cow;
 use std::hash::{Hash, Hasher};
@@ -55,6 +56,7 @@ mod lock;
 pub mod registry;
 mod snippet;
 mod styled_buffer;
+
 pub use snippet::Style;
 
 pub type PResult<'a, T> = Result<T, DiagnosticBuilder<'a, ErrorGuaranteed>>;
@@ -400,9 +402,7 @@ impl fmt::Display for ExplicitBug {
 
 impl error::Error for ExplicitBug {}
 
-pub use diagnostic::{
-    Diagnostic, DiagnosticId, DiagnosticMessage, DiagnosticStyledString, SubDiagnostic,
-};
+pub use diagnostic::{Diagnostic, DiagnosticId, DiagnosticStyledString, SubDiagnostic};
 pub use diagnostic_builder::{DiagnosticBuilder, EmissionGuarantee};
 use std::backtrace::Backtrace;
 

compiler/rustc_expand/src/base.rs

@@ -10,7 +10,7 @@ use rustc_ast::{self as ast, AstLike, Attribute, Item, NodeId, PatKind};
 use rustc_attr::{self as attr, Deprecation, Stability};
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::sync::{self, Lrc};
-use rustc_errors::{Applicability, DiagnosticBuilder, ErrorGuaranteed};
+use rustc_errors::{Applicability, DiagnosticBuilder, ErrorGuaranteed, MultiSpan};
 use rustc_lint_defs::builtin::PROC_MACRO_BACK_COMPAT;
 use rustc_lint_defs::BuiltinLintDiagnostics;
 use rustc_parse::{self, nt_to_tokenstream, parser, MACRO_ARGUMENTS};
@@ -20,7 +20,7 @@ use rustc_span::edition::Edition;
 use rustc_span::hygiene::{AstPass, ExpnData, ExpnKind, LocalExpnId};
 use rustc_span::source_map::SourceMap;
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
-use rustc_span::{MultiSpan, Span, DUMMY_SP};
+use rustc_span::{Span, DUMMY_SP};
 use smallvec::{smallvec, SmallVec};
 
 use std::default::Default;

compiler/rustc_expand/src/mbe/macro_check.rs

@@ -109,10 +109,11 @@ use crate::mbe::{KleeneToken, TokenTree};
 use rustc_ast::token::{DelimToken, Token, TokenKind};
 use rustc_ast::{NodeId, DUMMY_NODE_ID};
 use rustc_data_structures::fx::FxHashMap;
+use rustc_errors::MultiSpan;
 use rustc_session::lint::builtin::META_VARIABLE_MISUSE;
 use rustc_session::parse::ParseSess;
 use rustc_span::symbol::kw;
-use rustc_span::{symbol::MacroRulesNormalizedIdent, MultiSpan, Span};
+use rustc_span::{symbol::MacroRulesNormalizedIdent, Span};
 
 use smallvec::SmallVec;
 

compiler/rustc_expand/src/proc_macro_server.rs

@@ -7,13 +7,13 @@ use rustc_ast::tokenstream::{DelimSpan, Spacing::*, TokenStream, TreeAndSpacing}
 use rustc_ast_pretty::pprust;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::sync::Lrc;
-use rustc_errors::{Diagnostic, PResult};
+use rustc_errors::{Diagnostic, MultiSpan, PResult};
 use rustc_parse::lexer::nfc_normalize;
 use rustc_parse::{nt_to_tokenstream, parse_stream_from_source_str};
 use rustc_session::parse::ParseSess;
 use rustc_span::def_id::CrateNum;
 use rustc_span::symbol::{self, kw, sym, Symbol};
-use rustc_span::{BytePos, FileName, MultiSpan, Pos, SourceFile, Span};
+use rustc_span::{BytePos, FileName, Pos, SourceFile, Span};
 
 use pm::bridge::{server, TokenTree};
 use pm::{Delimiter, Level, LineColumn, Spacing};

compiler/rustc_expand/src/tests.rs

@@ -4,11 +4,11 @@ use rustc_parse::{new_parser_from_source_str, parser::Parser, source_file_to_str
 use rustc_session::parse::ParseSess;
 use rustc_span::create_default_session_if_not_set_then;
 use rustc_span::source_map::{FilePathMapping, SourceMap};
-use rustc_span::{BytePos, MultiSpan, Span};
+use rustc_span::{BytePos, Span};
 
 use rustc_data_structures::sync::Lrc;
 use rustc_errors::emitter::EmitterWriter;
-use rustc_errors::{Handler, PResult};
+use rustc_errors::{Handler, MultiSpan, PResult};
 
 use std::io;
 use std::io::prelude::*;

compiler/rustc_hir/Cargo.toml

@@ -11,6 +11,7 @@ rustc_target = { path = "../rustc_target" }
 rustc_feature = { path = "../rustc_feature" }
 rustc_macros = { path = "../rustc_macros" }
 rustc_data_structures = { path = "../rustc_data_structures" }
+rustc_error_messages = { path = "../rustc_error_messages" }
 rustc_index = { path = "../rustc_index" }
 rustc_span = { path = "../rustc_span" }
 rustc_serialize = { path = "../rustc_serialize" }

compiler/rustc_hir/src/hir.rs

@@ -13,12 +13,13 @@ use rustc_ast::{InlineAsmOptions, InlineAsmTemplatePiece};
 use rustc_data_structures::fingerprint::Fingerprint;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::sorted_map::SortedMap;
+use rustc_error_messages::MultiSpan;
 use rustc_index::vec::IndexVec;
 use rustc_macros::HashStable_Generic;
 use rustc_span::hygiene::MacroKind;
 use rustc_span::source_map::Spanned;
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
-use rustc_span::{def_id::LocalDefId, BytePos, MultiSpan, Span, DUMMY_SP};
+use rustc_span::{def_id::LocalDefId, BytePos, Span, DUMMY_SP};
 use rustc_target::asm::InlineAsmRegOrRegClass;
 use rustc_target::spec::abi::Abi;
 

compiler/rustc_infer/src/infer/error_reporting/mod.rs

@@ -59,7 +59,7 @@ use crate::traits::{
 
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_errors::{pluralize, struct_span_err, Diagnostic, ErrorGuaranteed};
-use rustc_errors::{Applicability, DiagnosticBuilder, DiagnosticStyledString};
+use rustc_errors::{Applicability, DiagnosticBuilder, DiagnosticStyledString, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_hir::lang_items::LangItem;
@@ -72,7 +72,7 @@ use rustc_middle::ty::{
     subst::{GenericArgKind, Subst, SubstsRef},
     Binder, List, Region, Ty, TyCtxt, TypeFoldable,
 };
-use rustc_span::{sym, BytePos, DesugaringKind, MultiSpan, Pos, Span};
+use rustc_span::{sym, BytePos, DesugaringKind, Pos, Span};
 use rustc_target::spec::abi;
 use std::ops::ControlFlow;
 use std::{cmp, fmt, iter};

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/mismatched_static_lifetime.rs

@@ -7,11 +7,10 @@ use crate::infer::lexical_region_resolve::RegionResolutionError;
 use crate::infer::{SubregionOrigin, TypeTrace};
 use crate::traits::ObligationCauseCode;
 use rustc_data_structures::stable_set::FxHashSet;
-use rustc_errors::{Applicability, ErrorGuaranteed};
+use rustc_errors::{Applicability, ErrorGuaranteed, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::intravisit::Visitor;
 use rustc_middle::ty::TypeVisitor;
-use rustc_span::MultiSpan;
 
 impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
     pub(super) fn try_report_mismatched_static_lifetime(&self) -> Option<ErrorGuaranteed> {

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/static_impl_trait.rs

@@ -5,7 +5,7 @@ use crate::infer::lexical_region_resolve::RegionResolutionError;
 use crate::infer::{SubregionOrigin, TypeTrace};
 use crate::traits::{ObligationCauseCode, UnifyReceiverContext};
 use rustc_data_structures::stable_set::FxHashSet;
-use rustc_errors::{struct_span_err, Applicability, Diagnostic, ErrorGuaranteed};
+use rustc_errors::{struct_span_err, Applicability, Diagnostic, ErrorGuaranteed, MultiSpan};
 use rustc_hir::def_id::DefId;
 use rustc_hir::intravisit::{walk_ty, Visitor};
 use rustc_hir::{self as hir, GenericBound, Item, ItemKind, Lifetime, LifetimeName, Node, TyKind};
@@ -13,7 +13,7 @@ use rustc_middle::ty::{
     self, AssocItemContainer, StaticLifetimeVisitor, Ty, TyCtxt, TypeFoldable, TypeVisitor,
 };
 use rustc_span::symbol::Ident;
-use rustc_span::{MultiSpan, Span};
+use rustc_span::Span;
 
 use std::ops::ControlFlow;
 

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/trait_impl_difference.rs

@@ -4,7 +4,7 @@ use crate::infer::error_reporting::nice_region_error::NiceRegionError;
 use crate::infer::lexical_region_resolve::RegionResolutionError;
 use crate::infer::{SubregionOrigin, Subtype};
 use crate::traits::ObligationCauseCode::CompareImplMethodObligation;
-use rustc_errors::ErrorGuaranteed;
+use rustc_errors::{ErrorGuaranteed, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def::Res;
 use rustc_hir::def_id::{DefId, LocalDefId};
@@ -12,8 +12,7 @@ use rustc_hir::intravisit::Visitor;
 use rustc_middle::hir::nested_filter;
 use rustc_middle::ty::print::RegionHighlightMode;
 use rustc_middle::ty::{self, Ty, TyCtxt, TypeFoldable, TypeVisitor};
-
-use rustc_span::{MultiSpan, Span, Symbol};
+use rustc_span::{Span, Symbol};
 
 use std::ops::ControlFlow;
 

compiler/rustc_infer/src/traits/error_reporting/mod.rs

@@ -2,11 +2,11 @@ use super::ObjectSafetyViolation;
 
 use crate::infer::InferCtxt;
 use rustc_data_structures::fx::FxHashSet;
-use rustc_errors::{struct_span_err, DiagnosticBuilder, ErrorGuaranteed};
+use rustc_errors::{struct_span_err, DiagnosticBuilder, ErrorGuaranteed, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_middle::ty::TyCtxt;
-use rustc_span::{MultiSpan, Span};
+use rustc_span::Span;
 use std::fmt;
 use std::iter;
 

compiler/rustc_interface/src/passes.rs

@@ -10,7 +10,7 @@ use rustc_codegen_ssa::traits::CodegenBackend;
 use rustc_data_structures::parallel;
 use rustc_data_structures::sync::{Lrc, OnceCell, WorkerLocal};
 use rustc_data_structures::temp_dir::MaybeTempDir;
-use rustc_errors::{Applicability, ErrorGuaranteed, PResult};
+use rustc_errors::{Applicability, ErrorGuaranteed, MultiSpan, PResult};
 use rustc_expand::base::{ExtCtxt, LintStoreExpand, ResolverExpand};
 use rustc_hir::def_id::{StableCrateId, LOCAL_CRATE};
 use rustc_hir::Crate;
@@ -35,7 +35,7 @@ use rustc_session::output::{filename_for_input, filename_for_metadata};
 use rustc_session::search_paths::PathKind;
 use rustc_session::{Limit, Session};
 use rustc_span::symbol::{sym, Symbol};
-use rustc_span::{FileName, MultiSpan};
+use rustc_span::FileName;
 use rustc_trait_selection::traits;
 use rustc_typeck as typeck;
 use tempfile::Builder as TempFileBuilder;

compiler/rustc_lint/src/builtin.rs

@@ -31,7 +31,7 @@ use rustc_ast::{self as ast, *};
 use rustc_ast_pretty::pprust::{self, expr_to_string};
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::stack::ensure_sufficient_stack;
-use rustc_errors::{Applicability, Diagnostic, DiagnosticStyledString};
+use rustc_errors::{Applicability, Diagnostic, DiagnosticStyledString, MultiSpan};
 use rustc_feature::{deprecated_attributes, AttributeGate, BuiltinAttribute, GateIssue, Stability};
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};
@@ -49,7 +49,7 @@ use rustc_session::lint::{BuiltinLintDiagnostics, FutureIncompatibilityReason};
 use rustc_span::edition::Edition;
 use rustc_span::source_map::Spanned;
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
-use rustc_span::{BytePos, InnerSpan, MultiSpan, Span};
+use rustc_span::{BytePos, InnerSpan, Span};
 use rustc_target::abi::VariantIdx;
 use rustc_trait_selection::traits::{self, misc::can_type_implement_copy};
 

compiler/rustc_lint/src/context.rs

@@ -21,7 +21,7 @@ use crate::passes::{EarlyLintPassObject, LateLintPassObject};
 use rustc_ast::util::unicode::TEXT_FLOW_CONTROL_CHARS;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::sync;
-use rustc_errors::{struct_span_err, Applicability, SuggestionStyle};
+use rustc_errors::{struct_span_err, Applicability, MultiSpan, SuggestionStyle};
 use rustc_hir as hir;
 use rustc_hir::def::Res;
 use rustc_hir::def_id::{CrateNum, DefId};
@@ -38,7 +38,7 @@ use rustc_session::lint::{FutureIncompatibleInfo, Level, Lint, LintBuffer, LintI
 use rustc_session::Session;
 use rustc_span::lev_distance::find_best_match_for_name;
 use rustc_span::symbol::{sym, Ident, Symbol};
-use rustc_span::{BytePos, MultiSpan, Span, DUMMY_SP};
+use rustc_span::{BytePos, Span, DUMMY_SP};
 use rustc_target::abi;
 use tracing::debug;
 

compiler/rustc_lint/src/levels.rs

@@ -3,7 +3,7 @@ use crate::late::unerased_lint_store;
 use rustc_ast as ast;
 use rustc_ast_pretty::pprust;
 use rustc_data_structures::fx::FxHashMap;
-use rustc_errors::{struct_span_err, Applicability, Diagnostic};
+use rustc_errors::{struct_span_err, Applicability, Diagnostic, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::{intravisit, HirId};
 use rustc_middle::hir::nested_filter;
@@ -20,7 +20,7 @@ use rustc_session::lint::{
 use rustc_session::parse::{add_feature_diagnostics, feature_err};
 use rustc_session::Session;
 use rustc_span::symbol::{sym, Symbol};
-use rustc_span::{source_map::MultiSpan, Span, DUMMY_SP};
+use rustc_span::{Span, DUMMY_SP};
 use tracing::debug;
 
 fn lint_levels(tcx: TyCtxt<'_>, (): ()) -> LintLevelMap {

compiler/rustc_lint/src/unused.rs

@@ -3,7 +3,7 @@ use crate::{EarlyContext, EarlyLintPass, LateContext, LateLintPass, LintContext}
 use rustc_ast as ast;
 use rustc_ast::util::{classify, parser};
 use rustc_ast::{ExprKind, StmtKind};
-use rustc_errors::{pluralize, Applicability};
+use rustc_errors::{pluralize, Applicability, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::DefId;
@@ -11,7 +11,7 @@ use rustc_middle::ty::adjustment;
 use rustc_middle::ty::{self, Ty};
 use rustc_span::symbol::Symbol;
 use rustc_span::symbol::{kw, sym};
-use rustc_span::{BytePos, MultiSpan, Span, DUMMY_SP};
+use rustc_span::{BytePos, Span, DUMMY_SP};
 
 declare_lint! {
     /// The `unused_must_use` lint detects unused result of a type flagged as

compiler/rustc_lint_defs/Cargo.toml

@@ -6,6 +6,7 @@ edition = "2021"
 [dependencies]
 rustc_ast = { path = "../rustc_ast" }
 rustc_data_structures = { path = "../rustc_data_structures" }
+rustc_error_messages = { path = "../rustc_error_messages" }
 rustc_span = { path = "../rustc_span" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_macros = { path = "../rustc_macros" }

compiler/rustc_lint_defs/src/lib.rs

@@ -7,10 +7,11 @@ pub use self::Level::*;
 use rustc_ast::node_id::{NodeId, NodeMap};
 use rustc_ast::{AttrId, Attribute};
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher, ToStableHashKey};
+use rustc_error_messages::MultiSpan;
 use rustc_hir::HirId;
 use rustc_serialize::json::Json;
 use rustc_span::edition::Edition;
-use rustc_span::{sym, symbol::Ident, MultiSpan, Span, Symbol};
+use rustc_span::{sym, symbol::Ident, Span, Symbol};
 use rustc_target::spec::abi::Abi;
 
 pub mod builtin;

compiler/rustc_middle/src/lint.rs

@@ -3,7 +3,7 @@ use std::cmp;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_errors::{
-    Diagnostic, DiagnosticBuilder, DiagnosticId, EmissionGuarantee, ErrorGuaranteed,
+    Diagnostic, DiagnosticBuilder, DiagnosticId, EmissionGuarantee, ErrorGuaranteed, MultiSpan,
 };
 use rustc_hir::HirId;
 use rustc_index::vec::IndexVec;
@@ -14,7 +14,7 @@ use rustc_session::lint::{
 };
 use rustc_session::Session;
 use rustc_span::hygiene::MacroKind;
-use rustc_span::source_map::{DesugaringKind, ExpnKind, MultiSpan};
+use rustc_span::source_map::{DesugaringKind, ExpnKind};
 use rustc_span::{symbol, Span, Symbol, DUMMY_SP};
 
 /// How a lint level was set.

compiler/rustc_middle/src/ty/context.rs

@@ -34,7 +34,7 @@ use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_data_structures::steal::Steal;
 use rustc_data_structures::sync::{self, Lock, Lrc, WorkerLocal};
 use rustc_data_structures::vec_map::VecMap;
-use rustc_errors::ErrorGuaranteed;
+use rustc_errors::{ErrorGuaranteed, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, LocalDefId, LOCAL_CRATE};
@@ -54,7 +54,7 @@ use rustc_session::lint::{Level, Lint};
 use rustc_session::Limit;
 use rustc_session::Session;
 use rustc_span::def_id::{DefPathHash, StableCrateId};
-use rustc_span::source_map::{MultiSpan, SourceMap};
+use rustc_span::source_map::SourceMap;
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
 use rustc_span::{Span, DUMMY_SP};
 use rustc_target::abi::{Layout, LayoutS, TargetDataLayout, VariantIdx};

compiler/rustc_middle/src/ty/error.rs

@@ -3,11 +3,11 @@ use crate::ty::diagnostics::suggest_constraining_type_param;
 use crate::ty::print::{FmtPrinter, Printer};
 use crate::ty::{self, BoundRegionKind, Region, Ty, TyCtxt};
 use rustc_errors::Applicability::{MachineApplicable, MaybeIncorrect};
-use rustc_errors::{pluralize, Diagnostic};
+use rustc_errors::{pluralize, Diagnostic, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_span::symbol::{sym, Symbol};
-use rustc_span::{BytePos, MultiSpan, Span};
+use rustc_span::{BytePos, Span};
 use rustc_target::spec::abi;
 
 use std::borrow::Cow;

compiler/rustc_middle/src/util/bug.rs

@@ -1,7 +1,8 @@
 // These functions are used by macro expansion for bug! and span_bug!
 
 use crate::ty::{tls, TyCtxt};
-use rustc_span::{MultiSpan, Span};
+use rustc_errors::MultiSpan;
+use rustc_span::Span;
 use std::fmt;
 use std::panic::{panic_any, Location};
 

compiler/rustc_mir_build/src/thir/pattern/check_match.rs

@@ -8,7 +8,7 @@ use rustc_arena::TypedArena;
 use rustc_ast::Mutability;
 use rustc_errors::{
     error_code, pluralize, struct_span_err, Applicability, Diagnostic, DiagnosticBuilder,
-    ErrorGuaranteed,
+    ErrorGuaranteed, MultiSpan,
 };
 use rustc_hir as hir;
 use rustc_hir::def::*;
@@ -21,7 +21,7 @@ use rustc_session::lint::builtin::{
 };
 use rustc_session::Session;
 use rustc_span::source_map::Spanned;
-use rustc_span::{BytePos, DesugaringKind, ExpnKind, MultiSpan, Span};
+use rustc_span::{BytePos, DesugaringKind, ExpnKind, Span};
 
 crate fn check_match(tcx: TyCtxt<'_>, def_id: DefId) {
     let body_id = match def_id.as_local() {

compiler/rustc_parse/src/parser/diagnostics.rs

@@ -18,10 +18,10 @@ use rustc_ast::{
 use rustc_ast_pretty::pprust;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::{pluralize, struct_span_err, Diagnostic, EmissionGuarantee, ErrorGuaranteed};
-use rustc_errors::{Applicability, DiagnosticBuilder, Handler, PResult};
+use rustc_errors::{Applicability, DiagnosticBuilder, Handler, MultiSpan, PResult};
 use rustc_span::source_map::Spanned;
 use rustc_span::symbol::{kw, Ident};
-use rustc_span::{MultiSpan, Span, SpanSnippetError, DUMMY_SP};
+use rustc_span::{Span, SpanSnippetError, DUMMY_SP};
 use std::ops::{Deref, DerefMut};
 
 use std::mem::take;
@@ -1752,7 +1752,7 @@ impl<'a> Parser<'a> {
                     let mut primary_span: MultiSpan = primary_span.into();
                     for span_label in err.span.span_labels() {
                         if let Some(label) = span_label.label {
-                            primary_span.push_span_label(span_label.span, label);
+                            primary_span.push_span_message(span_label.span, label);
                         }
                     }
                     err.set_span(primary_span);

compiler/rustc_parse/src/parser/mod.rs

@@ -33,10 +33,10 @@ use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::sync::Lrc;
 use rustc_errors::PResult;
 use rustc_errors::{
-    struct_span_err, Applicability, DiagnosticBuilder, ErrorGuaranteed, FatalError,
+    struct_span_err, Applicability, DiagnosticBuilder, ErrorGuaranteed, FatalError, MultiSpan,
 };
 use rustc_session::parse::ParseSess;
-use rustc_span::source_map::{MultiSpan, Span, DUMMY_SP};
+use rustc_span::source_map::{Span, DUMMY_SP};
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
 use tracing::debug;
 

compiler/rustc_passes/src/check_attr.rs

@@ -6,7 +6,7 @@
 
 use rustc_ast::{ast, AttrStyle, Attribute, Lit, LitKind, MetaItemKind, NestedMetaItem};
 use rustc_data_structures::fx::FxHashMap;
-use rustc_errors::{pluralize, struct_span_err, Applicability};
+use rustc_errors::{pluralize, struct_span_err, Applicability, MultiSpan};
 use rustc_feature::{AttributeDuplicates, AttributeType, BuiltinAttribute, BUILTIN_ATTRIBUTE_MAP};
 use rustc_hir as hir;
 use rustc_hir::def_id::{LocalDefId, CRATE_DEF_ID};
@@ -21,7 +21,7 @@ use rustc_session::lint::builtin::{
 };
 use rustc_session::parse::feature_err;
 use rustc_span::symbol::{sym, Symbol};
-use rustc_span::{MultiSpan, Span, DUMMY_SP};
+use rustc_span::{Span, DUMMY_SP};
 use std::collections::hash_map::Entry;
 
 pub(crate) fn target_from_impl_item<'tcx>(

compiler/rustc_resolve/src/check_unused.rs

@@ -32,10 +32,10 @@ use rustc_ast::node_id::NodeMap;
 use rustc_ast::visit::{self, Visitor};
 use rustc_ast_lowering::ResolverAstLowering;
 use rustc_data_structures::fx::FxHashSet;
-use rustc_errors::pluralize;
+use rustc_errors::{pluralize, MultiSpan};
 use rustc_session::lint::builtin::{MACRO_USE_EXTERN_CRATE, UNUSED_IMPORTS};
 use rustc_session::lint::BuiltinLintDiagnostics;
-use rustc_span::{MultiSpan, Span, DUMMY_SP};
+use rustc_span::{Span, DUMMY_SP};
 
 struct UnusedImport<'a> {
     use_tree: &'a ast::UseTree,

compiler/rustc_resolve/src/diagnostics.rs

@@ -4,7 +4,7 @@ use rustc_ast::{self as ast, Path};
 use rustc_ast_pretty::pprust;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::{
-    struct_span_err, Applicability, Diagnostic, DiagnosticBuilder, ErrorGuaranteed,
+    struct_span_err, Applicability, Diagnostic, DiagnosticBuilder, ErrorGuaranteed, MultiSpan,
 };
 use rustc_feature::BUILTIN_ATTRIBUTES;
 use rustc_hir::def::Namespace::{self, *};
@@ -18,7 +18,7 @@ use rustc_span::hygiene::MacroKind;
 use rustc_span::lev_distance::find_best_match_for_name;
 use rustc_span::source_map::SourceMap;
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
-use rustc_span::{BytePos, MultiSpan, Span};
+use rustc_span::{BytePos, Span};
 use tracing::debug;
 
 use crate::imports::{Import, ImportKind, ImportResolver};

compiler/rustc_resolve/src/imports.rs

@@ -12,7 +12,7 @@ use crate::{NameBinding, NameBindingKind, PathResult, PrivacyError, ToNameBindin
 use rustc_ast::NodeId;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_data_structures::intern::Interned;
-use rustc_errors::{pluralize, struct_span_err, Applicability};
+use rustc_errors::{pluralize, struct_span_err, Applicability, MultiSpan};
 use rustc_hir::def::{self, PartialRes};
 use rustc_hir::def_id::DefId;
 use rustc_middle::metadata::ModChild;
@@ -23,7 +23,7 @@ use rustc_session::lint::BuiltinLintDiagnostics;
 use rustc_span::hygiene::LocalExpnId;
 use rustc_span::lev_distance::find_best_match_for_name;
 use rustc_span::symbol::{kw, Ident, Symbol};
-use rustc_span::{MultiSpan, Span};
+use rustc_span::Span;
 
 use tracing::*;
 

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -14,6 +14,7 @@ use rustc_ast_pretty::pprust::path_segment_to_string;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::{
     pluralize, struct_span_err, Applicability, Diagnostic, DiagnosticBuilder, ErrorGuaranteed,
+    MultiSpan,
 };
 use rustc_hir as hir;
 use rustc_hir::def::Namespace::{self, *};
@@ -25,7 +26,7 @@ use rustc_span::edition::Edition;
 use rustc_span::hygiene::MacroKind;
 use rustc_span::lev_distance::find_best_match_for_name;
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
-use rustc_span::{BytePos, MultiSpan, Span, DUMMY_SP};
+use rustc_span::{BytePos, Span, DUMMY_SP};
 
 use std::iter;
 use std::ops::Deref;
@@ -1106,7 +1107,7 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
                         .collect();
 
                     if non_visible_spans.len() > 0 {
-                        let mut m: rustc_span::MultiSpan = non_visible_spans.clone().into();
+                        let mut m: MultiSpan = non_visible_spans.clone().into();
                         non_visible_spans
                             .into_iter()
                             .for_each(|s| m.push_span_label(s, "private field".to_string()));

compiler/rustc_session/src/parse.rs

@@ -7,12 +7,14 @@ use rustc_ast::node_id::NodeId;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::sync::{Lock, Lrc};
 use rustc_errors::{emitter::SilentEmitter, ColorConfig, Handler};
-use rustc_errors::{error_code, Applicability, Diagnostic, DiagnosticBuilder, ErrorGuaranteed};
+use rustc_errors::{
+    error_code, Applicability, Diagnostic, DiagnosticBuilder, ErrorGuaranteed, MultiSpan,
+};
 use rustc_feature::{find_feature_issue, GateIssue, UnstableFeatures};
 use rustc_span::edition::Edition;
 use rustc_span::hygiene::ExpnId;
 use rustc_span::source_map::{FilePathMapping, SourceMap};
-use rustc_span::{MultiSpan, Span, Symbol};
+use rustc_span::{Span, Symbol};
 
 use std::str;
 

compiler/rustc_session/src/session.rs

@@ -19,11 +19,11 @@ use rustc_errors::annotate_snippet_emitter_writer::AnnotateSnippetEmitterWriter;
 use rustc_errors::emitter::{Emitter, EmitterWriter, HumanReadableErrorType};
 use rustc_errors::json::JsonEmitter;
 use rustc_errors::registry::Registry;
-use rustc_errors::{DiagnosticBuilder, DiagnosticId, ErrorGuaranteed};
+use rustc_errors::{DiagnosticBuilder, DiagnosticId, ErrorGuaranteed, MultiSpan};
 use rustc_macros::HashStable_Generic;
 pub use rustc_span::def_id::StableCrateId;
 use rustc_span::edition::Edition;
-use rustc_span::source_map::{FileLoader, MultiSpan, RealFileLoader, SourceMap, Span};
+use rustc_span::source_map::{FileLoader, RealFileLoader, SourceMap, Span};
 use rustc_span::{sym, SourceFileHashAlgorithm, Symbol};
 use rustc_target::asm::InlineAsmArch;
 use rustc_target::spec::{CodeModel, PanicStrategy, RelocModel, RelroLevel};

compiler/rustc_span/src/lib.rs

@@ -520,20 +520,6 @@ impl Ord for Span {
     }
 }
 
-/// A collection of `Span`s.
-///
-/// Spans have two orthogonal attributes:
-///
-/// - They can be *primary spans*. In this case they are the locus of
-///   the error, and would be rendered with `^^^`.
-/// - They can have a *label*. In this case, the label is written next
-///   to the mark in the snippet when we render.
-#[derive(Clone, Debug, Hash, PartialEq, Eq, Encodable, Decodable)]
-pub struct MultiSpan {
-    primary_spans: Vec<Span>,
-    span_labels: Vec<(Span, String)>,
-}
-
 impl Span {
     #[inline]
     pub fn lo(self) -> BytePos {
@@ -949,20 +935,6 @@ impl Span {
     }
 }
 
-/// A span together with some additional data.
-#[derive(Clone, Debug)]
-pub struct SpanLabel {
-    /// The span we are going to include in the final snippet.
-    pub span: Span,
-
-    /// Is this a primary span? This is the "locus" of the message,
-    /// and is indicated with a `^^^^` underline, versus `----`.
-    pub is_primary: bool,
-
-    /// What label should we attach to this span (if any)?
-    pub label: Option<String>,
-}
-
 impl Default for Span {
     fn default() -> Self {
         DUMMY_SP
@@ -1035,115 +1007,6 @@ impl fmt::Debug for SpanData {
     }
 }
 
-impl MultiSpan {
-    #[inline]
-    pub fn new() -> MultiSpan {
-        MultiSpan { primary_spans: vec![], span_labels: vec![] }
-    }
-
-    pub fn from_span(primary_span: Span) -> MultiSpan {
-        MultiSpan { primary_spans: vec![primary_span], span_labels: vec![] }
-    }
-
-    pub fn from_spans(mut vec: Vec<Span>) -> MultiSpan {
-        vec.sort();
-        MultiSpan { primary_spans: vec, span_labels: vec![] }
-    }
-
-    pub fn push_span_label(&mut self, span: Span, label: String) {
-        self.span_labels.push((span, label));
-    }
-
-    /// Selects the first primary span (if any).
-    pub fn primary_span(&self) -> Option<Span> {
-        self.primary_spans.first().cloned()
-    }
-
-    /// Returns all primary spans.
-    pub fn primary_spans(&self) -> &[Span] {
-        &self.primary_spans
-    }
-
-    /// Returns `true` if any of the primary spans are displayable.
-    pub fn has_primary_spans(&self) -> bool {
-        self.primary_spans.iter().any(|sp| !sp.is_dummy())
-    }
-
-    /// Returns `true` if this contains only a dummy primary span with any hygienic context.
-    pub fn is_dummy(&self) -> bool {
-        let mut is_dummy = true;
-        for span in &self.primary_spans {
-            if !span.is_dummy() {
-                is_dummy = false;
-            }
-        }
-        is_dummy
-    }
-
-    /// Replaces all occurrences of one Span with another. Used to move `Span`s in areas that don't
-    /// display well (like std macros). Returns whether replacements occurred.
-    pub fn replace(&mut self, before: Span, after: Span) -> bool {
-        let mut replacements_occurred = false;
-        for primary_span in &mut self.primary_spans {
-            if *primary_span == before {
-                *primary_span = after;
-                replacements_occurred = true;
-            }
-        }
-        for span_label in &mut self.span_labels {
-            if span_label.0 == before {
-                span_label.0 = after;
-                replacements_occurred = true;
-            }
-        }
-        replacements_occurred
-    }
-
-    /// Returns the strings to highlight. We always ensure that there
-    /// is an entry for each of the primary spans -- for each primary
-    /// span `P`, if there is at least one label with span `P`, we return
-    /// those labels (marked as primary). But otherwise we return
-    /// `SpanLabel` instances with empty labels.
-    pub fn span_labels(&self) -> Vec<SpanLabel> {
-        let is_primary = |span| self.primary_spans.contains(&span);
-
-        let mut span_labels = self
-            .span_labels
-            .iter()
-            .map(|&(span, ref label)| SpanLabel {
-                span,
-                is_primary: is_primary(span),
-                label: Some(label.clone()),
-            })
-            .collect::<Vec<_>>();
-
-        for &span in &self.primary_spans {
-            if !span_labels.iter().any(|sl| sl.span == span) {
-                span_labels.push(SpanLabel { span, is_primary: true, label: None });
-            }
-        }
-
-        span_labels
-    }
-
-    /// Returns `true` if any of the span labels is displayable.
-    pub fn has_span_labels(&self) -> bool {
-        self.span_labels.iter().any(|(sp, _)| !sp.is_dummy())
-    }
-}
-
-impl From<Span> for MultiSpan {
-    fn from(span: Span) -> MultiSpan {
-        MultiSpan::from_span(span)
-    }
-}
-
-impl From<Vec<Span>> for MultiSpan {
-    fn from(spans: Vec<Span>) -> MultiSpan {
-        MultiSpan::from_spans(spans)
-    }
-}
-
 /// Identifies an offset of a multi-byte character in a `SourceFile`.
 #[derive(Copy, Clone, Encodable, Decodable, Eq, PartialEq, Debug)]
 pub struct MultiByteChar {

compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs

@@ -15,7 +15,7 @@ use crate::infer::{self, InferCtxt, TyCtxtInferExt};
 use rustc_data_structures::fx::FxHashMap;
 use rustc_errors::{
     pluralize, struct_span_err, Applicability, Diagnostic, DiagnosticBuilder, ErrorGuaranteed,
-    Style,
+    MultiSpan, Style,
 };
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
@@ -33,7 +33,7 @@ use rustc_middle::ty::{
     self, SubtypePredicate, ToPolyTraitRef, ToPredicate, TraitRef, Ty, TyCtxt, TypeFoldable,
 };
 use rustc_span::symbol::{kw, sym};
-use rustc_span::{ExpnKind, MultiSpan, Span, DUMMY_SP};
+use rustc_span::{ExpnKind, Span, DUMMY_SP};
 use std::fmt;
 use std::iter;
 

compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs

@@ -11,7 +11,7 @@ use rustc_data_structures::fx::FxHashSet;
 use rustc_data_structures::stack::ensure_sufficient_stack;
 use rustc_errors::{
     error_code, pluralize, struct_span_err, Applicability, Diagnostic, DiagnosticBuilder,
-    ErrorGuaranteed, Style,
+    ErrorGuaranteed, MultiSpan, Style,
 };
 use rustc_hir as hir;
 use rustc_hir::def::DefKind;
@@ -27,7 +27,7 @@ use rustc_middle::ty::{TypeAndMut, TypeckResults};
 use rustc_session::Limit;
 use rustc_span::def_id::LOCAL_CRATE;
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
-use rustc_span::{BytePos, DesugaringKind, ExpnKind, MultiSpan, Span, DUMMY_SP};
+use rustc_span::{BytePos, DesugaringKind, ExpnKind, Span, DUMMY_SP};
 use rustc_target::spec::abi;
 use std::fmt;
 

compiler/rustc_trait_selection/src/traits/object_safety.rs

@@ -14,7 +14,7 @@ use crate::infer::TyCtxtInferExt;
 use crate::traits::const_evaluatable::{self, AbstractConst};
 use crate::traits::query::evaluate_obligation::InferCtxtExt;
 use crate::traits::{self, Obligation, ObligationCause};
-use rustc_errors::FatalError;
+use rustc_errors::{FatalError, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_middle::ty::subst::{GenericArg, InternalSubsts, Subst};
@@ -22,7 +22,7 @@ use rustc_middle::ty::{self, Ty, TyCtxt, TypeFoldable, TypeVisitor};
 use rustc_middle::ty::{Predicate, ToPredicate};
 use rustc_session::lint::builtin::WHERE_CLAUSES_OBJECT_SAFETY;
 use rustc_span::symbol::Symbol;
-use rustc_span::{MultiSpan, Span};
+use rustc_span::Span;
 use smallvec::SmallVec;
 
 use std::iter;

compiler/rustc_typeck/src/astconv/generics.rs

@@ -6,7 +6,7 @@ use crate::astconv::{
 use crate::errors::AssocTypeBindingNotAllowed;
 use crate::structured_errors::{GenericArgsInfo, StructuredDiagnostic, WrongNumberOfGenericArgs};
 use rustc_ast::ast::ParamKindOrd;
-use rustc_errors::{struct_span_err, Applicability, Diagnostic};
+use rustc_errors::{struct_span_err, Applicability, Diagnostic, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::DefId;
@@ -16,7 +16,7 @@ use rustc_middle::ty::{
     self, subst, subst::SubstsRef, GenericParamDef, GenericParamDefKind, Ty, TyCtxt,
 };
 use rustc_session::lint::builtin::LATE_BOUND_LIFETIME_ARGUMENTS;
-use rustc_span::{symbol::kw, MultiSpan, Span};
+use rustc_span::{symbol::kw, Span};
 use smallvec::SmallVec;
 
 impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {

compiler/rustc_typeck/src/check/_match.rs

@@ -1,11 +1,11 @@
 use crate::check::coercion::{AsCoercionSite, CoerceMany};
 use crate::check::{Diverges, Expectation, FnCtxt, Needs};
-use rustc_errors::{Applicability, Diagnostic};
+use rustc_errors::{Applicability, Diagnostic, MultiSpan};
 use rustc_hir::{self as hir, ExprKind};
 use rustc_infer::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
 use rustc_infer::traits::Obligation;
 use rustc_middle::ty::{self, ToPredicate, Ty, TypeFoldable};
-use rustc_span::{MultiSpan, Span};
+use rustc_span::Span;
 use rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt;
 use rustc_trait_selection::traits::{
     IfExpressionCause, MatchExpressionArmCause, ObligationCause, ObligationCauseCode,

compiler/rustc_typeck/src/check/check.rs

@@ -4,7 +4,7 @@ use super::compare_method::{compare_const_impl, compare_impl_method, compare_ty_
 use super::*;
 
 use rustc_attr as attr;
-use rustc_errors::{Applicability, ErrorGuaranteed};
+use rustc_errors::{Applicability, ErrorGuaranteed, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_hir::intravisit::Visitor;
@@ -20,7 +20,7 @@ use rustc_middle::ty::util::{Discr, IntTypeExt};
 use rustc_middle::ty::{self, ParamEnv, Ty, TyCtxt};
 use rustc_session::lint::builtin::{UNINHABITED_STATIC, UNSUPPORTED_CALLING_CONVENTIONS};
 use rustc_span::symbol::sym;
-use rustc_span::{self, MultiSpan, Span};
+use rustc_span::{self, Span};
 use rustc_target::spec::abi::Abi;
 use rustc_trait_selection::traits;
 use rustc_trait_selection::traits::error_reporting::InferCtxtExt as _;

compiler/rustc_typeck/src/check/fn_ctxt/_impl.rs

@@ -8,7 +8,7 @@ use crate::check::{BreakableCtxt, Diverges, Expectation, FnCtxt, LocalTy};
 
 use rustc_data_structures::captures::Captures;
 use rustc_data_structures::fx::FxHashSet;
-use rustc_errors::{Applicability, Diagnostic, ErrorGuaranteed};
+use rustc_errors::{Applicability, Diagnostic, ErrorGuaranteed, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def::{CtorOf, DefKind, Res};
 use rustc_hir::def_id::DefId;
@@ -30,7 +30,7 @@ use rustc_session::lint;
 use rustc_span::hygiene::DesugaringKind;
 use rustc_span::source_map::{original_sp, DUMMY_SP};
 use rustc_span::symbol::{kw, sym, Ident};
-use rustc_span::{self, BytePos, MultiSpan, Span};
+use rustc_span::{self, BytePos, Span};
 use rustc_trait_selection::infer::InferCtxtExt as _;
 use rustc_trait_selection::traits::error_reporting::InferCtxtExt as _;
 use rustc_trait_selection::traits::{

compiler/rustc_typeck/src/check/fn_ctxt/checks.rs

@@ -11,7 +11,7 @@ use crate::check::{
 
 use rustc_ast as ast;
 use rustc_data_structures::sync::Lrc;
-use rustc_errors::{Applicability, Diagnostic, DiagnosticId};
+use rustc_errors::{Applicability, Diagnostic, DiagnosticId, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def::{CtorOf, DefKind, Res};
 use rustc_hir::def_id::DefId;
@@ -21,7 +21,7 @@ use rustc_middle::ty::fold::TypeFoldable;
 use rustc_middle::ty::{self, Ty};
 use rustc_session::Session;
 use rustc_span::symbol::Ident;
-use rustc_span::{self, MultiSpan, Span};
+use rustc_span::{self, Span};
 use rustc_trait_selection::traits::{self, ObligationCauseCode, StatementAsExpression};
 
 use crate::structured_errors::StructuredDiagnostic;

compiler/rustc_typeck/src/check/fn_ctxt/suggestions.rs

@@ -2,9 +2,9 @@ use super::FnCtxt;
 use crate::astconv::AstConv;
 
 use rustc_ast::util::parser::ExprPrecedence;
-use rustc_span::{self, MultiSpan, Span};
+use rustc_span::{self, Span};
 
-use rustc_errors::{Applicability, Diagnostic};
+use rustc_errors::{Applicability, Diagnostic, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def::{CtorOf, DefKind};
 use rustc_hir::lang_items::LangItem;

compiler/rustc_typeck/src/check/method/suggest.rs

@@ -5,6 +5,7 @@ use crate::check::FnCtxt;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_errors::{
     pluralize, struct_span_err, Applicability, Diagnostic, DiagnosticBuilder, ErrorGuaranteed,
+    MultiSpan,
 };
 use rustc_hir as hir;
 use rustc_hir::def_id::{DefId, LocalDefId};
@@ -17,7 +18,7 @@ use rustc_middle::ty::print::with_crate_prefix;
 use rustc_middle::ty::ToPolyTraitRef;
 use rustc_middle::ty::{self, DefIdTree, ToPredicate, Ty, TyCtxt, TypeFoldable};
 use rustc_span::symbol::{kw, sym, Ident};
-use rustc_span::{lev_distance, source_map, ExpnKind, FileName, MacroKind, MultiSpan, Span};
+use rustc_span::{lev_distance, source_map, ExpnKind, FileName, MacroKind, Span};
 use rustc_trait_selection::traits::error_reporting::on_unimplemented::InferCtxtExt as _;
 use rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt as _;
 use rustc_trait_selection::traits::{

compiler/rustc_typeck/src/check/mod.rs

@@ -103,7 +103,7 @@ pub use inherited::{Inherited, InheritedBuilder};
 use crate::astconv::AstConv;
 use crate::check::gather_locals::GatherLocalsVisitor;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
-use rustc_errors::{pluralize, struct_span_err, Applicability};
+use rustc_errors::{pluralize, struct_span_err, Applicability, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def::Res;
 use rustc_hir::def_id::{DefId, LocalDefId};
@@ -121,7 +121,7 @@ use rustc_session::parse::feature_err;
 use rustc_session::Session;
 use rustc_span::source_map::DUMMY_SP;
 use rustc_span::symbol::{kw, Ident};
-use rustc_span::{self, BytePos, MultiSpan, Span};
+use rustc_span::{self, BytePos, Span};
 use rustc_target::abi::VariantIdx;
 use rustc_target::spec::abi::Abi;
 use rustc_trait_selection::traits;

compiler/rustc_typeck/src/check/pat.rs

@@ -4,6 +4,7 @@ use rustc_ast as ast;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_errors::{
     pluralize, struct_span_err, Applicability, Diagnostic, DiagnosticBuilder, ErrorGuaranteed,
+    MultiSpan,
 };
 use rustc_hir as hir;
 use rustc_hir::def::{CtorKind, DefKind, Res};
@@ -18,7 +19,7 @@ use rustc_span::hygiene::DesugaringKind;
 use rustc_span::lev_distance::find_best_match_for_name;
 use rustc_span::source_map::{Span, Spanned};
 use rustc_span::symbol::{kw, sym, Ident};
-use rustc_span::{BytePos, MultiSpan, DUMMY_SP};
+use rustc_span::{BytePos, DUMMY_SP};
 use rustc_trait_selection::autoderef::Autoderef;
 use rustc_trait_selection::traits::{ObligationCause, Pattern};
 use ty::VariantDef;

compiler/rustc_typeck/src/check/upvar.rs

@@ -33,7 +33,7 @@
 use super::FnCtxt;
 
 use crate::expr_use_visitor as euv;
-use rustc_errors::Applicability;
+use rustc_errors::{Applicability, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_hir::def_id::LocalDefId;
@@ -46,7 +46,7 @@ use rustc_middle::ty::{
 };
 use rustc_session::lint;
 use rustc_span::sym;
-use rustc_span::{BytePos, MultiSpan, Pos, Span, Symbol};
+use rustc_span::{BytePos, Pos, Span, Symbol};
 use rustc_trait_selection::infer::InferCtxtExt;
 
 use rustc_data_structures::stable_map::FxHashMap;

compiler/rustc_typeck/src/structured_errors/wrong_number_of_generic_args.rs

@@ -1,13 +1,14 @@
 use crate::structured_errors::StructuredDiagnostic;
 use rustc_errors::{
     pluralize, Applicability, Diagnostic, DiagnosticBuilder, DiagnosticId, ErrorGuaranteed,
+    MultiSpan,
 };
 use rustc_hir as hir;
 use rustc_middle::hir::map::fn_sig;
 use rustc_middle::middle::resolve_lifetime::LifetimeScopeForPath;
 use rustc_middle::ty::{self as ty, TyCtxt};
 use rustc_session::Session;
-use rustc_span::{def_id::DefId, MultiSpan};
+use rustc_span::def_id::DefId;
 
 use GenericArgsInfo::*;
 

src/tools/clippy/clippy_lints/src/collapsible_match.rs

@@ -3,11 +3,12 @@ use clippy_utils::higher::IfLetOrMatch;
 use clippy_utils::visitors::is_local_used;
 use clippy_utils::{is_lang_ctor, is_unit_expr, path_to_local, peel_blocks_with_stmt, peel_ref_operators, SpanlessEq};
 use if_chain::if_chain;
+use rustc_errors::MultiSpan;
 use rustc_hir::LangItem::OptionNone;
 use rustc_hir::{Arm, Expr, Guard, HirId, Pat, PatKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
-use rustc_span::{MultiSpan, Span};
+use rustc_span::Span;
 
 declare_clippy_lint! {
     /// ### What it does

src/tools/clippy/clippy_lints/src/doc.rs

@@ -11,7 +11,7 @@ use rustc_ast::token::CommentKind;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_data_structures::sync::Lrc;
 use rustc_errors::emitter::EmitterWriter;
-use rustc_errors::{Applicability, Handler, SuggestionStyle};
+use rustc_errors::{Applicability, Handler, MultiSpan, SuggestionStyle};
 use rustc_hir as hir;
 use rustc_hir::intravisit::{self, Visitor};
 use rustc_hir::{AnonConst, Expr};
@@ -25,7 +25,7 @@ use rustc_session::parse::ParseSess;
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::def_id::LocalDefId;
 use rustc_span::edition::Edition;
-use rustc_span::source_map::{BytePos, FilePathMapping, MultiSpan, SourceMap, Span};
+use rustc_span::source_map::{BytePos, FilePathMapping, SourceMap, Span};
 use rustc_span::{sym, FileName, Pos};
 use std::io;
 use std::ops::Range;

src/tools/clippy/clippy_lints/src/loops/needless_collect.rs

@@ -6,7 +6,7 @@ use clippy_utils::ty::is_type_diagnostic_item;
 use clippy_utils::{can_move_expr_to_closure, is_trait_method, path_to_local, path_to_local_id, CaptureKind};
 use if_chain::if_chain;
 use rustc_data_structures::fx::FxHashMap;
-use rustc_errors::Applicability;
+use rustc_errors::{Applicability, MultiSpan};
 use rustc_hir::intravisit::{walk_block, walk_expr, Visitor};
 use rustc_hir::{Block, Expr, ExprKind, HirId, HirIdSet, Local, Mutability, Node, PatKind, Stmt, StmtKind};
 use rustc_lint::LateContext;
@@ -14,7 +14,7 @@ use rustc_middle::hir::nested_filter;
 use rustc_middle::ty::subst::GenericArgKind;
 use rustc_middle::ty::{self, Ty};
 use rustc_span::sym;
-use rustc_span::{MultiSpan, Span};
+use rustc_span::Span;
 
 const NEEDLESS_COLLECT_MSG: &str = "avoid using `collect()` when not needed";
 

src/tools/clippy/clippy_lints/src/ptr.rs

@@ -5,7 +5,7 @@ use clippy_utils::source::snippet_opt;
 use clippy_utils::ty::expr_sig;
 use clippy_utils::{get_expr_use_or_unification_node, is_lint_allowed, path_def_id, path_to_local, paths};
 use if_chain::if_chain;
-use rustc_errors::Applicability;
+use rustc_errors::{Applicability, MultiSpan};
 use rustc_hir::def_id::DefId;
 use rustc_hir::hir_id::HirIdMap;
 use rustc_hir::intravisit::{walk_expr, Visitor};
@@ -19,8 +19,8 @@ use rustc_middle::hir::nested_filter;
 use rustc_middle::ty::{self, Ty};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
+use rustc_span::sym;
 use rustc_span::symbol::Symbol;
-use rustc_span::{sym, MultiSpan};
 use std::fmt;
 use std::iter;
 

src/tools/clippy/clippy_utils/src/diagnostics.rs

@@ -8,10 +8,10 @@
 //! Thank you!
 //! ~The `INTERNAL_METADATA_COLLECTOR` lint
 
-use rustc_errors::{emitter::MAX_SUGGESTION_HIGHLIGHT_LINES, Applicability, Diagnostic};
+use rustc_errors::{emitter::MAX_SUGGESTION_HIGHLIGHT_LINES, Applicability, Diagnostic, MultiSpan};
 use rustc_hir::HirId;
 use rustc_lint::{LateContext, Lint, LintContext};
-use rustc_span::source_map::{MultiSpan, Span};
+use rustc_span::source_map::Span;
 use std::env;
 
 fn docs_link(diag: &mut Diagnostic, lint: &'static Lint) {
@@ -155,7 +155,13 @@ where
     });
 }
 
-pub fn span_lint_hir(cx: &LateContext<'_>, lint: &'static Lint, hir_id: HirId, sp: Span, msg: &str) {
+pub fn span_lint_hir(
+    cx: &LateContext<'_>,
+    lint: &'static Lint,
+    hir_id: HirId,
+    sp: Span,
+    msg: &str,
+) {
     cx.tcx.struct_span_lint_hir(lint, hir_id, sp, |diag| {
         let mut diag = diag.build(msg);
         docs_link(&mut diag, lint);
@@ -272,9 +278,14 @@ pub fn span_lint_and_sugg_for_edges(
         let sugg_lines_count = sugg.lines().count();
         if sugg_lines_count > MAX_SUGGESTION_HIGHLIGHT_LINES {
             let sm = cx.sess().source_map();
-            if let (Ok(line_upper), Ok(line_bottom)) = (sm.lookup_line(sp.lo()), sm.lookup_line(sp.hi())) {
+            if let (Ok(line_upper), Ok(line_bottom)) =
+                (sm.lookup_line(sp.lo()), sm.lookup_line(sp.hi()))
+            {
                 let split_idx = MAX_SUGGESTION_HIGHLIGHT_LINES / 2;
-                let span_upper = sm.span_until_char(sp.with_hi(line_upper.sf.lines[line_upper.line + split_idx]), '\n');
+                let span_upper = sm.span_until_char(
+                    sp.with_hi(line_upper.sf.lines[line_upper.line + split_idx]),
+                    '\n',
+                );
                 let span_bottom = sp.with_lo(line_bottom.sf.lines[line_bottom.line - split_idx]);
 
                 let sugg_lines_vec = sugg.lines().collect::<Vec<&str>>();

src/tools/rustfmt/src/parse/session.rs

@@ -313,7 +313,8 @@ mod tests {
         use super::*;
         use crate::config::IgnoreList;
         use crate::utils::mk_sp;
-        use rustc_span::{FileName as SourceMapFileName, MultiSpan, RealFileName};
+        use rustc_errors::MultiSpan;
+        use rustc_span::{FileName as SourceMapFileName, RealFileName};
         use std::path::PathBuf;
         use std::sync::atomic::AtomicU32;