3 files changed, 25 insertions, 9 deletions
diff --git a/compiler/rustc_errors/src/annotate_snippet_emitter_writer.rs b/compiler/rustc_errors/src/annotate_snippet_emitter_writer.rs
index 6f365c07f6d..577baec21f0 100644
--- a/compiler/rustc_errors/src/annotate_snippet_emitter_writer.rs
+++ b/compiler/rustc_errors/src/annotate_snippet_emitter_writer.rs
@@ -126,7 +126,8 @@ impl AnnotateSnippetEmitterWriter {
             }
             // owned: line source, line index, annotations
             type Owned = (String, usize, Vec<crate::snippet::Annotation>);
-            let origin = primary_lo.file.name.to_string();
+            let filename = primary_lo.file.name.prefer_local();
+            let origin = filename.to_string_lossy();
             let annotated_files: Vec<Owned> = annotated_files
                 .into_iter()
                 .flat_map(|annotated_file| {
diff --git a/compiler/rustc_errors/src/emitter.rs b/compiler/rustc_errors/src/emitter.rs
index a58caf2667b..c4c15136cf8 100644
--- a/compiler/rustc_errors/src/emitter.rs
+++ b/compiler/rustc_errors/src/emitter.rs
@@ -309,7 +309,9 @@ pub trait Emitter {
                     // are some which do actually involve macros.
                     ExpnKind::Inlined | ExpnKind::Desugaring(..) | ExpnKind::AstPass(..) => None,
 
-                    ExpnKind::Macro(macro_kind, _) => Some(macro_kind),
+                    ExpnKind::Macro { kind: macro_kind, name: _, proc_macro: _ } => {
+                        Some(macro_kind)
+                    }
                 }
             });
 
@@ -371,10 +373,19 @@ pub trait Emitter {
                     new_labels
                         .push((trace.call_site, "in the inlined copy of this code".to_string()));
                 } else if always_backtrace {
+                    let proc_macro = if let ExpnKind::Macro { kind: _, name: _, proc_macro: true } =
+                        trace.kind
+                    {
+                        "procedural macro "
+                    } else {
+                        ""
+                    };
+
                     new_labels.push((
                         trace.def_site,
                         format!(
-                            "in this expansion of `{}`{}",
+                            "in this expansion of {}`{}`{}",
+                            proc_macro,
                             trace.kind.descr(),
                             if macro_backtrace.len() > 1 {
                                 // if macro_backtrace.len() == 1 it'll be
@@ -400,7 +411,11 @@ pub trait Emitter {
                 // and it needs an "in this macro invocation" label to match that.
                 let redundant_span = trace.call_site.contains(sp);
 
-                if !redundant_span && matches!(trace.kind, ExpnKind::Macro(MacroKind::Bang, _))
+                if !redundant_span
+                    && matches!(
+                        trace.kind,
+                        ExpnKind::Macro { kind: MacroKind::Bang, name: _, proc_macro: _ }
+                    )
                     || always_backtrace
                 {
                     new_labels.push((
@@ -1309,7 +1324,7 @@ impl EmitterWriter {
                         buffer_msg_line_offset,
                         &format!(
                             "{}:{}:{}",
-                            loc.file.name,
+                            loc.file.name.prefer_local(),
                             sm.doctest_offset_line(&loc.file.name, loc.line),
                             loc.col.0 + 1,
                         ),
@@ -1323,7 +1338,7 @@ impl EmitterWriter {
                         0,
                         &format!(
                             "{}:{}:{}: ",
-                            loc.file.name,
+                            loc.file.name.prefer_local(),
                             sm.doctest_offset_line(&loc.file.name, loc.line),
                             loc.col.0 + 1,
                         ),
@@ -1347,12 +1362,12 @@ impl EmitterWriter {
                     };
                     format!(
                         "{}:{}{}",
-                        annotated_file.file.name,
+                        annotated_file.file.name.prefer_local(),
                         sm.doctest_offset_line(&annotated_file.file.name, first_line.line_index),
                         col
                     )
                 } else {
-                    annotated_file.file.name.to_string()
+                    format!("{}", annotated_file.file.name.prefer_local())
                 };
                 buffer.append(buffer_msg_line_offset + 1, &loc, Style::LineAndColumn);
                 for _ in 0..max_line_num_len {
diff --git a/compiler/rustc_errors/src/json.rs b/compiler/rustc_errors/src/json.rs
index 40277006462..5d175a3ade9 100644
--- a/compiler/rustc_errors/src/json.rs
+++ b/compiler/rustc_errors/src/json.rs
@@ -468,7 +468,7 @@ impl DiagnosticSpan {
         });
 
         DiagnosticSpan {
-            file_name: start.file.name.to_string(),
+            file_name: start.file.name.prefer_local().to_string(),
             byte_start: start.file.original_relative_byte_pos(span.lo()).0,
             byte_end: start.file.original_relative_byte_pos(span.hi()).0,
             line_start: start.line,