Remove `doc(include)`

clippy_lints/src/missing_doc.rs

@@ -7,8 +7,7 @@
 
 use clippy_utils::attrs::is_doc_hidden;
 use clippy_utils::diagnostics::span_lint;
-use if_chain::if_chain;
-use rustc_ast::ast::{self, MetaItem, MetaItemKind};
+use rustc_ast::ast;
 use rustc_hir as hir;
 use rustc_lint::{LateContext, LateLintPass, LintContext};
 use rustc_middle::ty;
@@ -56,20 +55,6 @@ impl MissingDoc {
         *self.doc_hidden_stack.last().expect("empty doc_hidden_stack")
     }
 
-    fn has_include(meta: Option<MetaItem>) -> bool {
-        if_chain! {
-            if let Some(meta) = meta;
-            if let MetaItemKind::List(list) = meta.kind;
-            if let Some(meta) = list.get(0);
-            if let Some(name) = meta.ident();
-            then {
-                name.name == sym::include
-            } else {
-                false
-            }
-        }
-    }
-
     fn check_missing_docs_attrs(
         &self,
         cx: &LateContext<'_>,
@@ -95,7 +80,7 @@ impl MissingDoc {
 
         let has_doc = attrs
             .iter()
-            .any(|a| a.doc_str().is_some() || Self::has_include(a.meta()));
+            .any(|a| a.doc_str().is_some());
         if !has_doc {
             span_lint(
                 cx,

tests/ui/missing-doc-crate.rs

@@ -1,5 +1,4 @@
 #![warn(clippy::missing_docs_in_private_items)]
-#![feature(external_doc)]
-#![doc(include = "../../README.md")]
+#![doc = include_str!("../../README.md")]
 
 fn main() {}