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-rw-r--r--compiler/rustc_attr/messages.ftl2
1 files changed, 2 insertions, 0 deletions
diff --git a/compiler/rustc_attr/messages.ftl b/compiler/rustc_attr/messages.ftl
index 5d9ac23ec49..adabf18ca85 100644
--- a/compiler/rustc_attr/messages.ftl
+++ b/compiler/rustc_attr/messages.ftl
@@ -107,6 +107,8 @@ attr_unknown_version_literal =
 attr_unstable_cfg_target_compact =
     compact `cfg(target(..))` is experimental and subject to change
 
+attr_unsupported_literal_cfg_boolean =
+    literal in `cfg` predicate value must be a boolean
 attr_unsupported_literal_cfg_string =
     literal in `cfg` predicate value must be a string
 attr_unsupported_literal_deprecated_kv_pair =