add rustc_macro_edition_2021

1 files changed, 5 insertions, 1 deletions

diff --git a/compiler/rustc_resolve/src/macros.rs b/compiler/rustc_resolve/src/macros.rs
index 7100d89ad61..5bb6ec3e7ce 100644
--- a/compiler/rustc_resolve/src/macros.rs
+++ b/compiler/rustc_resolve/src/macros.rs
@@ -8,7 +8,7 @@ use std::sync::Arc;
 use rustc_ast::expand::StrippedCfgItem;
 use rustc_ast::{self as ast, Crate, NodeId, attr};
 use rustc_ast_pretty::pprust;
-use rustc_attr_parsing::StabilityLevel;
+use rustc_attr_parsing::{AttributeKind, StabilityLevel, find_attr};
 use rustc_data_structures::intern::Interned;
 use rustc_errors::{Applicability, StashKey};
 use rustc_expand::base::{
@@ -1125,6 +1125,10 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
             edition,
         );
 
+        if find_attr!(attrs.iter(), AttributeKind::RustcMacroEdition2021 {}) {
+            ext.edition = Edition::Edition2021;
+        }
+
         if let Some(builtin_name) = ext.builtin_name {
             // The macro was marked with `#[rustc_builtin_macro]`.
             if let Some(builtin_macro) = self.builtin_macros.get_mut(&builtin_name) {