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-rw-r--r--src/test/ui/tls.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/test/ui/tls.rs b/src/test/ui/tls.rs
index cfc94c10c9e..c696318e70f 100644
--- a/src/test/ui/tls.rs
+++ b/src/test/ui/tls.rs
@@ -1,4 +1,5 @@
 // run-pass
+// compile-flags: -O
 
 #![feature(thread_local)]