Introduce Span::is_visible

Author: estebank

compiler/rustc_span/src/lib.rs

@@ -491,6 +491,10 @@ impl SpanData {
     pub fn is_dummy(self) -> bool {
         self.lo.0 == 0 && self.hi.0 == 0
     }
+    #[inline]
+    pub fn is_visible(self, sm: &SourceMap) -> bool {
+        !self.is_dummy() && sm.is_span_accessible(self.span())
+    }
     /// Returns `true` if `self` fully encloses `other`.
     pub fn contains(self, other: Self) -> bool {
         self.lo <= other.lo && other.hi <= self.hi
@@ -556,6 +560,11 @@ impl Span {
         self.data_untracked().is_dummy()
     }
 
+    #[inline]
+    pub fn is_visible(self, sm: &SourceMap) -> bool {
+        self.data_untracked().is_visible(sm)
+    }
+
     /// Returns `true` if this span comes from any kind of macro, desugaring or inlining.
     #[inline]
     pub fn from_expansion(self) -> bool {

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

@@ -2413,19 +2413,19 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
             | ObligationCauseCode::ExprBindingObligation(item_def_id, span, ..) => {
                 let item_name = tcx.def_path_str(item_def_id);
                 let mut multispan = MultiSpan::from(span);
+                let sm = tcx.sess.source_map();
                 if let Some(ident) = tcx.opt_item_ident(item_def_id) {
-                    let sm = tcx.sess.source_map();
                     let same_line =
                         match (sm.lookup_line(ident.span.hi()), sm.lookup_line(span.lo())) {
                             (Ok(l), Ok(r)) => l.line == r.line,
                             _ => true,
                         };
-                    if !ident.span.is_dummy() && !ident.span.overlaps(span) && !same_line {
+                    if ident.span.is_visible(sm) && !ident.span.overlaps(span) && !same_line {
                         multispan.push_span_label(ident.span, "required by a bound in this");
                     }
                 }
                 let descr = format!("required by a bound in `{}`", item_name);
-                if !span.is_dummy() {
+                if span.is_visible(sm) {
                     let msg = format!("required by this bound in `{}`", item_name);
                     multispan.push_span_label(span, msg);
                     err.span_note(multispan, &descr);

src/test/ui/span/issue-71363.stderr

@@ -8,8 +8,6 @@ error[E0277]: `MyError` doesn't implement `std::fmt::Display`
   = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
 note: required by a bound in `std::error::Error`
  --> $SRC_DIR/core/src/error.rs:LL:COL
-  |
-  = note: required by this bound in `std::error::Error`
 
 error[E0277]: `MyError` doesn't implement `Debug`
  --> $DIR/issue-71363.rs:4:6
@@ -21,8 +19,6 @@ error[E0277]: `MyError` doesn't implement `Debug`
   = note: add `#[derive(Debug)]` to `MyError` or manually `impl Debug for MyError`
 note: required by a bound in `std::error::Error`
  --> $SRC_DIR/core/src/error.rs:LL:COL
-  |
-  = note: required by this bound in `std::error::Error`
 help: consider annotating `MyError` with `#[derive(Debug)]`
   |
 3 | #[derive(Debug)]