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, 2 insertions, 5 deletions

diff --git a/compiler/rustc_mir/src/transform/coverage/spans.rs b/compiler/rustc_mir/src/transform/coverage/spans.rs
index f62171b3c53..08cc87ccc34 100644
--- a/compiler/rustc_mir/src/transform/coverage/spans.rs
+++ b/compiler/rustc_mir/src/transform/coverage/spans.rs
@@ -184,11 +184,8 @@ impl CoverageSpan {
         self.current_macro_or_none
             .borrow_mut()
             .get_or_insert_with(|| {
-                if let ExpnKind::Macro {
-                    kind: MacroKind::Bang,
-                    name: current_macro,
-                    proc_macro: _,
-                } = self.expn_span.ctxt().outer_expn_data().kind
+                if let ExpnKind::Macro(MacroKind::Bang, current_macro) =
+                    self.expn_span.ctxt().outer_expn_data().kind
                 {
                     return Some(current_macro);
                 }