rustc_span: Revert addition of `proc_macro` field to `ExpnKind::Macro`

The flag has a vague meaning and is used for a single diagnostic change that is low benefit and appears only under `-Z macro_backtrace`.

1 files changed, 3 insertions, 18 deletions

diff --git a/compiler/rustc_errors/src/emitter.rs b/compiler/rustc_errors/src/emitter.rs
index d3f92bf3047..fd024a8ecfa 100644
--- a/compiler/rustc_errors/src/emitter.rs
+++ b/compiler/rustc_errors/src/emitter.rs
@@ -309,9 +309,7 @@ pub trait Emitter {
                     // are some which do actually involve macros.
                     ExpnKind::Inlined | ExpnKind::Desugaring(..) | ExpnKind::AstPass(..) => None,
 
-                    ExpnKind::Macro { kind: macro_kind, name, proc_macro: _ } => {
-                        Some((macro_kind, name))
-                    }
+                    ExpnKind::Macro(macro_kind, name) => Some((macro_kind, name)),
                 }
             });
 
@@ -372,19 +370,10 @@ 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 {}`{}`{}",
-                            proc_macro,
+                            "in this expansion of `{}`{}",
                             trace.kind.descr(),
                             if macro_backtrace.len() > 1 {
                                 // if macro_backtrace.len() == 1 it'll be
@@ -410,11 +399,7 @@ 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 { kind: MacroKind::Bang, name: _, proc_macro: _ }
-                    )
+                if !redundant_span && matches!(trace.kind, ExpnKind::Macro(MacroKind::Bang, _))
                     || always_backtrace
                 {
                     new_labels.push((