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-rw-r--r--compiler/rustc_parse/src/validate_attr.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_parse/src/validate_attr.rs b/compiler/rustc_parse/src/validate_attr.rs
index 47432a3b7ff..ff5bcdce97b 100644
--- a/compiler/rustc_parse/src/validate_attr.rs
+++ b/compiler/rustc_parse/src/validate_attr.rs
@@ -272,6 +272,7 @@ pub fn check_builtin_meta_item(
             name,
             sym::inline
                 | sym::export_stable
+                | sym::ffi_const
                 | sym::may_dangle
                 | sym::rustc_as_ptr
                 | sym::rustc_pub_transparent