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-rw-r--r--compiler/rustc_span/src/symbol.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
index 555764c26a6..6807f96e712 100644
--- a/compiler/rustc_span/src/symbol.rs
+++ b/compiler/rustc_span/src/symbol.rs
@@ -623,6 +623,7 @@ symbols! {
         cfg_target_has_atomic_equal_alignment,
         cfg_target_thread_local,
         cfg_target_vendor,
+        cfg_trace: "<cfg>", // must not be a valid identifier
         cfg_ub_checks,
         cfg_version,
         cfi,