Auto merge of rust-lang#7856 - Manishearth:impl-safety, r=xFrednet

missing_safety_doc: Handle 'implementation safety' headers as well

We hit some FPs on this in `yoke`, it's somewhat normal to mark trait impl safety with "implementation safety". We could also broaden the check for headers which contain the word "safety" somehow, or split out impl safety stuff to only apply to traits.

changelog: handle 'implementation safety' headers in `missing_safety_doc`

clippy_lints/src/doc.rs

@@ -578,9 +578,12 @@ fn check_doc<'a, Events: Iterator<Item = (pulldown_cmark::Event<'a>, Range<usize
                     // text "http://example.com" by pulldown-cmark
                     continue;
                 }
-                headers.safety |= in_heading && text.trim() == "Safety";
-                headers.errors |= in_heading && text.trim() == "Errors";
-                headers.panics |= in_heading && text.trim() == "Panics";
+                let trimmed_text = text.trim();
+                headers.safety |= in_heading && trimmed_text == "Safety";
+                headers.safety |= in_heading && trimmed_text == "Implementation safety";
+                headers.safety |= in_heading && trimmed_text == "Implementation Safety";
+                headers.errors |= in_heading && trimmed_text == "Errors";
+                headers.panics |= in_heading && trimmed_text == "Panics";
                 if in_code {
                     if is_rust {
                         let edition = edition.unwrap_or_else(|| cx.tcx.sess.edition());

tests/ui/doc_unsafe.rs

@@ -125,3 +125,8 @@ pub mod __macro {
         pub unsafe fn f() {}
     }
 }
+
+/// # Implementation safety
+pub unsafe trait DocumentedUnsafeTraitWithImplementationHeader {
+    fn method();
+}