1 files changed, 14 insertions, 1 deletions
diff --git a/compiler/rustc_parse/src/parser/attr.rs b/compiler/rustc_parse/src/parser/attr.rs
index 98f94098bfc..73439643d69 100644
--- a/compiler/rustc_parse/src/parser/attr.rs
+++ b/compiler/rustc_parse/src/parser/attr.rs
@@ -4,7 +4,7 @@ use rustc_ast::attr;
 use rustc_ast::token::{self, Nonterminal};
 use rustc_ast_pretty::pprust;
 use rustc_errors::{error_code, PResult};
-use rustc_span::Span;
+use rustc_span::{sym, Span};
 
 use tracing::debug;
 
@@ -302,3 +302,16 @@ impl<'a> Parser<'a> {
         Err(self.struct_span_err(self.token.span, &msg))
     }
 }
+
+pub fn maybe_needs_tokens(attrs: &[ast::Attribute]) -> bool {
+    attrs.iter().any(|attr| {
+        if let Some(ident) = attr.ident() {
+            ident.name == sym::derive
+            // This might apply a custom attribute/derive
+            || ident.name == sym::cfg_attr
+            || !rustc_feature::is_builtin_attr_name(ident.name)
+        } else {
+            true
+        }
+    })
+}