Replace `no_ord_impl` with `orderable`.

Similar to the previous commit, this replaces `newtype_index`'s opt-out
`no_ord_impl` attribute with the opt-in `orderable` attribute.

compiler/rustc_ast/src/ast.rs

@@ -2574,6 +2574,7 @@ pub enum AttrStyle {
 }
 
 rustc_index::newtype_index! {
+    #[orderable]
     #[debug_format = "AttrId({})"]
     pub struct AttrId {}
 }

compiler/rustc_ast/src/node_id.rs

@@ -9,6 +9,7 @@ rustc_index::newtype_index! {
     ///
     /// [`DefId`]: rustc_span::def_id::DefId
     #[encodable]
+    #[orderable]
     #[debug_format = "NodeId({})"]
     pub struct NodeId {
         /// The [`NodeId`] used to represent the root of the crate.

compiler/rustc_borrowck/src/constraints/mod.rs

@@ -122,6 +122,7 @@ rustc_index::newtype_index! {
 }
 
 rustc_index::newtype_index! {
+    #[orderable]
     #[debug_format = "ConstraintSccIndex({})"]
     pub struct ConstraintSccIndex {}
 }

compiler/rustc_borrowck/src/dataflow.rs

@@ -109,6 +109,7 @@ impl_visitable! {
 }
 
 rustc_index::newtype_index! {
+    #[orderable]
     #[debug_format = "bw{}"]
     pub struct BorrowIndex {}
 }

compiler/rustc_borrowck/src/location.rs

@@ -20,6 +20,7 @@ pub struct LocationTable {
 }
 
 rustc_index::newtype_index! {
+    #[orderable]
     #[debug_format = "LocationIndex({})"]
     pub struct LocationIndex {}
 }

compiler/rustc_borrowck/src/region_infer/values.rs

@@ -90,6 +90,7 @@ impl RegionValueElements {
 rustc_index::newtype_index! {
     /// A single integer representing a `Location` in the MIR control-flow
     /// graph. Constructed efficiently from `RegionValueElements`.
+    #[orderable]
     #[debug_format = "PointIndex({})"]
     pub struct PointIndex {}
 }

compiler/rustc_data_structures/src/graph/dominators/mod.rs

@@ -23,6 +23,7 @@ struct PreOrderFrame<Iter> {
 }
 
 rustc_index::newtype_index! {
+    #[orderable]
     struct PreorderIndex {}
 }
 

compiler/rustc_hir/src/hir_id.rs

@@ -155,6 +155,7 @@ rustc_index::newtype_index! {
     /// tree or hash map.
     #[derive(HashStable_Generic)]
     #[encodable]
+    #[orderable]
     pub struct ItemLocalId {}
 }
 

compiler/rustc_hir_analysis/src/coherence/inherent_impls_overlap.rs

@@ -198,6 +198,7 @@ impl<'tcx> InherentOverlapChecker<'tcx> {
             // entire graph when there are many connected regions.
 
             rustc_index::newtype_index! {
+                #[orderable]
                 pub struct RegionId {}
             }
 

compiler/rustc_hir_typeck/src/fn_ctxt/arg_matrix.rs

@@ -4,11 +4,13 @@ use rustc_middle::ty::error::TypeError;
 use std::cmp;
 
 rustc_index::newtype_index! {
+    #[orderable]
     #[debug_format = "ExpectedIdx({})"]
     pub(crate) struct ExpectedIdx {}
 }
 
 rustc_index::newtype_index! {
+    #[orderable]
     #[debug_format = "ProvidedIdx({})"]
     pub(crate) struct ProvidedIdx {}
 }

compiler/rustc_index/src/vec/tests.rs

@@ -2,6 +2,7 @@
 use crate as rustc_index;
 
 crate::newtype_index! {
+    #[orderable]
     #[max = 0xFFFF_FFFA]
     struct MyIdx {}
 }

compiler/rustc_index_macros/src/newtype.rs

@@ -23,7 +23,7 @@ impl Parse for Newtype {
         let mut max = None;
         let mut consts = Vec::new();
         let mut encodable = false;
-        let mut ord = true;
+        let mut ord = false;
         let mut gate_rustc_only = quote! {};
         let mut gate_rustc_only_cfg = quote! { all() };
 
@@ -38,8 +38,8 @@ impl Parse for Newtype {
                     encodable = true;
                     false
                 }
-                "no_ord_impl" => {
-                    ord = false;
+                "orderable" => {
+                    ord = true;
                     false
                 }
                 "max" => {

compiler/rustc_infer/src/infer/region_constraints/leak_check.rs

@@ -341,11 +341,13 @@ impl<'tcx> SccUniverse<'tcx> {
 }
 
 rustc_index::newtype_index! {
+    #[orderable]
     #[debug_format = "LeakCheckNode({})"]
     struct LeakCheckNode {}
 }
 
 rustc_index::newtype_index! {
+    #[orderable]
     #[debug_format = "LeakCheckScc({})"]
     struct LeakCheckScc {}
 }

compiler/rustc_middle/src/middle/region.rs

@@ -149,6 +149,7 @@ rustc_index::newtype_index! {
     ///   and thus does not include EXPR_2, but covers the `...`.
     #[derive(HashStable)]
     #[encodable]
+    #[orderable]
     pub struct FirstStatementIndex {}
 }
 

compiler/rustc_middle/src/mir/coverage.rs

@@ -18,6 +18,7 @@ rustc_index::newtype_index! {
     /// to use a larger representation on the Rust side.
     #[derive(HashStable)]
     #[encodable]
+    #[orderable]
     #[max = 0xFFFF_FFFF]
     #[debug_format = "CounterId({})"]
     pub struct CounterId {}
@@ -39,6 +40,7 @@ rustc_index::newtype_index! {
     /// to use a larger representation on the Rust side.
     #[derive(HashStable)]
     #[encodable]
+    #[orderable]
     #[max = 0xFFFF_FFFF]
     #[debug_format = "ExpressionId({})"]
     pub struct ExpressionId {}

compiler/rustc_middle/src/mir/mod.rs

@@ -737,6 +737,7 @@ impl SourceInfo {
 rustc_index::newtype_index! {
     #[derive(HashStable)]
     #[encodable]
+    #[orderable]
     #[debug_format = "_{}"]
     pub struct Local {
         const RETURN_PLACE = 0;
@@ -1173,6 +1174,7 @@ rustc_index::newtype_index! {
     /// [guide-mir]: https://rustc-dev-guide.rust-lang.org/mir/
     #[derive(HashStable)]
     #[encodable]
+    #[orderable]
     #[debug_format = "bb{}"]
     pub struct BasicBlock {
         const START_BLOCK = 0;
@@ -1537,6 +1539,7 @@ impl UserTypeProjection {
 rustc_index::newtype_index! {
     #[derive(HashStable)]
     #[encodable]
+    #[orderable]
     #[debug_format = "promoted[{}]"]
     pub struct Promoted {}
 }

compiler/rustc_middle/src/ty/sty.rs

@@ -1613,6 +1613,7 @@ rustc_index::newtype_index! {
     /// A **region** (lifetime) **v**ariable **ID**.
     #[derive(HashStable)]
     #[encodable]
+    #[orderable]
     #[debug_format = "'?{}"]
     pub struct RegionVid {}
 }

compiler/rustc_mir_build/src/build/scope.rs

@@ -186,6 +186,7 @@ pub(crate) enum BreakableTarget {
 }
 
 rustc_index::newtype_index! {
+    #[orderable]
     struct DropIdx {}
 }
 

compiler/rustc_mir_dataflow/src/move_paths/mod.rs

@@ -14,6 +14,7 @@ use self::abs_domain::{AbstractElem, Lift};
 mod abs_domain;
 
 rustc_index::newtype_index! {
+    #[orderable]
     #[debug_format = "mp{}"]
     pub struct MovePathIndex {}
 }
@@ -25,6 +26,7 @@ impl polonius_engine::Atom for MovePathIndex {
 }
 
 rustc_index::newtype_index! {
+    #[orderable]
     #[debug_format = "mo{}"]
     pub struct MoveOutIndex {}
 }

compiler/rustc_mir_transform/src/coverage/graph.rs

@@ -264,6 +264,7 @@ impl graph::WithPredecessors for CoverageGraph {
 
 rustc_index::newtype_index! {
     /// A node in the control-flow graph of CoverageGraph.
+    #[orderable]
     #[debug_format = "bcb{}"]
     pub(super) struct BasicCoverageBlock {
         const START_BCB = 0;

compiler/rustc_span/src/def_id.rs

@@ -13,6 +13,7 @@ pub type StableCrateIdMap =
     indexmap::IndexMap<StableCrateId, CrateNum, BuildHasherDefault<Unhasher>>;
 
 rustc_index::newtype_index! {
+    #[orderable]
     #[debug_format = "crate{}"]
     pub struct CrateNum {}
 }
@@ -212,6 +213,7 @@ rustc_index::newtype_index! {
     /// A DefIndex is an index into the hir-map for a crate, identifying a
     /// particular definition. It should really be considered an interned
     /// shorthand for a particular DefPath.
+    #[orderable]
     #[debug_format = "DefIndex({})"]
     pub struct DefIndex {
         /// The crate root is always assigned index 0 by the AST Map code,

compiler/rustc_span/src/hygiene.rs

@@ -60,6 +60,7 @@ pub struct SyntaxContextData {
 
 rustc_index::newtype_index! {
     /// A unique ID associated with a macro invocation and expansion.
+    #[orderable]
     pub struct ExpnIndex {}
 }
 
@@ -79,7 +80,6 @@ impl fmt::Debug for ExpnId {
 
 rustc_index::newtype_index! {
     /// A unique ID associated with a macro invocation and expansion.
-    #[no_ord_impl]
     #[debug_format = "expn{}"]
     pub struct LocalExpnId {}
 }

compiler/rustc_span/src/symbol.rs

@@ -2018,6 +2018,7 @@ impl fmt::Display for MacroRulesNormalizedIdent {
 pub struct Symbol(SymbolIndex);
 
 rustc_index::newtype_index! {
+    #[orderable]
     struct SymbolIndex {}
 }
 

compiler/rustc_target/src/abi/mod.rs

@@ -43,6 +43,7 @@ rustc_index::newtype_index! {
     /// `f` is `FieldIdx(1)` in `VariantIdx(0)`.
     #[derive(HashStable_Generic)]
     #[encodable]
+    #[orderable]
     pub struct FieldIdx {}
 }
 
@@ -59,6 +60,7 @@ rustc_index::newtype_index! {
     /// with variant index zero, aka [`FIRST_VARIANT`].
     #[derive(HashStable_Generic)]
     #[encodable]
+    #[orderable]
     pub struct VariantIdx {
         /// Equivalent to `VariantIdx(0)`.
         const FIRST_VARIANT = 0;

compiler/rustc_trait_selection/src/solve/search_graph.rs

@@ -13,6 +13,7 @@ use rustc_session::Limit;
 use std::collections::hash_map::Entry;
 
 rustc_index::newtype_index! {
+    #[orderable]
     pub struct StackDepth {}
 }
 

compiler/rustc_type_ir/src/const_kind.rs

@@ -96,6 +96,7 @@ impl<I: Interner> DebugWithInfcx<I> for ConstKind<I> {
 rustc_index::newtype_index! {
     /// A **`const`** **v**ariable **ID**.
     #[encodable]
+    #[orderable]
     #[debug_format = "?{}c"]
     #[gate_rustc_only]
     pub struct ConstVid {}
@@ -110,6 +111,7 @@ rustc_index::newtype_index! {
     /// where we are not correctly using the effect var for an effect param. Fallback
     /// is also implemented on top of having separate effect and normal const variables.
     #[encodable]
+    #[orderable]
     #[debug_format = "?{}e"]
     #[gate_rustc_only]
     pub struct EffectVid {}

compiler/rustc_type_ir/src/lib.rs

@@ -93,6 +93,7 @@ rustc_index::newtype_index! {
     /// [dbi]: https://en.wikipedia.org/wiki/De_Bruijn_index
     #[cfg_attr(feature = "nightly", derive(HashStable_NoContext))]
     #[encodable]
+    #[orderable]
     #[debug_format = "DebruijnIndex({})"]
     #[gate_rustc_only]
     pub struct DebruijnIndex {
@@ -295,6 +296,7 @@ rustc_index::newtype_index! {
     /// use for checking generic functions.
     #[cfg_attr(feature = "nightly", derive(HashStable_NoContext))]
     #[encodable]
+    #[orderable]
     #[debug_format = "U{}"]
     #[gate_rustc_only]
     pub struct UniverseIndex {}
@@ -338,6 +340,7 @@ impl UniverseIndex {
 rustc_index::newtype_index! {
     #[cfg_attr(feature = "nightly", derive(HashStable_NoContext))]
     #[encodable]
+    #[orderable]
     #[debug_format = "{}"]
     #[gate_rustc_only]
     pub struct BoundVar {}

compiler/rustc_type_ir/src/ty_kind.rs

@@ -623,6 +623,7 @@ pub struct FloatVarValue(pub FloatTy);
 rustc_index::newtype_index! {
     /// A **ty**pe **v**ariable **ID**.
     #[encodable]
+    #[orderable]
     #[debug_format = "?{}t"]
     #[gate_rustc_only]
     pub struct TyVid {}
@@ -631,6 +632,7 @@ rustc_index::newtype_index! {
 rustc_index::newtype_index! {
     /// An **int**egral (`u32`, `i32`, `usize`, etc.) type **v**ariable **ID**.
     #[encodable]
+    #[orderable]
     #[debug_format = "?{}i"]
     #[gate_rustc_only]
     pub struct IntVid {}
@@ -639,6 +641,7 @@ rustc_index::newtype_index! {
 rustc_index::newtype_index! {
     /// A **float**ing-point (`f32` or `f64`) type **v**ariable **ID**.
     #[encodable]
+    #[orderable]
     #[debug_format = "?{}f"]
     #[gate_rustc_only]
     pub struct FloatVid {}