Point out macro expansion ident in resolver errors too

compiler/rustc_hir_typeck/src/method/suggest.rs

@@ -194,7 +194,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             node => unreachable!("{node:?}"),
         };
 
-        // Try to get the span of the identifier within the expression's syntax context (if that's different).
+        // Try to get the span of the identifier within the expression's syntax context
+        // (if that's different).
         let within_macro_span = span.within_macro(expr_span);
 
         // Avoid suggestions when we don't know what's going on.

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -429,6 +429,12 @@ impl<'ast, 'ra: 'ast, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
         let mut err = self.r.dcx().struct_span_err(base_error.span, base_error.msg.clone());
         err.code(code);
 
+        // Try to get the span of the identifier within the path's syntax context
+        // (if that's different).
+        if let Some(within_macro_span) = base_error.span.within_macro(span) {
+            err.span_label(within_macro_span, "within this macro");
+        }
+
         self.detect_missing_binding_available_from_pattern(&mut err, path, following_seg);
         self.suggest_at_operator_in_slice_pat_with_range(&mut err, path);
         self.suggest_swapping_misplaced_self_ty_and_trait(&mut err, source, res, base_error.span);

tests/ui/hygiene/generate-mod.stderr

@@ -1,12 +1,18 @@
 error[E0412]: cannot find type `FromOutside` in this scope
   --> $DIR/generate-mod.rs:35:13
    |
+LL |     type A = $FromOutside;
+   |              ------------ due to this macro variable
+...
 LL |     genmod!(FromOutside, Outer);
    |             ^^^^^^^^^^^ not found in this scope
 
 error[E0412]: cannot find type `Outer` in this scope
   --> $DIR/generate-mod.rs:35:26
    |
+LL |     struct $Outer;
+   |            ------ due to this macro variable
+...
 LL |     genmod!(FromOutside, Outer);
    |                          ^^^^^ not found in this scope
 

tests/ui/hygiene/globs.stderr

@@ -50,6 +50,9 @@ error[E0425]: cannot find function `f` in this scope
 LL | n!(f);
    | ----- in this macro invocation
 ...
+LL |                     $j();
+   |                     -- due to this macro variable
+...
 LL |         n!(f);
    |            ^ not found in this scope
    |
@@ -63,6 +66,9 @@ error[E0425]: cannot find function `f` in this scope
 LL | n!(f);
    | ----- in this macro invocation
 ...
+LL |                     $j();
+   |                     -- due to this macro variable
+...
 LL |                 f
    |                 ^ not found in this scope
    |

tests/ui/macros/macro-parameter-span.stderr

@@ -1,6 +1,9 @@
 error[E0425]: cannot find value `x` in this scope
   --> $DIR/macro-parameter-span.rs:11:9
    |
+LL |         $id
+   |         --- due to this macro variable
+...
 LL |         x
    |         ^ not found in this scope
 

tests/ui/macros/rfc-3086-metavar-expr/syntax-errors.stderr

@@ -338,6 +338,9 @@ LL |     no_curly__no_rhs_dollar__no_round!(a);
 error[E0425]: cannot find value `a` in this scope
   --> $DIR/syntax-errors.rs:152:37
    |
+LL |     ( $i:ident ) => { count($i) };
+   |                             -- due to this macro variable
+...
 LL |     no_curly__rhs_dollar__no_round!(a);
    |                                     ^ not found in this scope