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-rw-r--r--tests/ui/unpretty/expanded-interpolation.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/tests/ui/unpretty/expanded-interpolation.rs b/tests/ui/unpretty/expanded-interpolation.rs
index 1dc72c67f51..0c447ae669d 100644
--- a/tests/ui/unpretty/expanded-interpolation.rs
+++ b/tests/ui/unpretty/expanded-interpolation.rs
@@ -1,5 +1,6 @@
 //@ compile-flags: -Zunpretty=expanded
 //@ check-pass
+//@ edition: 2015
 
 // This test covers the AST pretty-printer's insertion of parentheses in some
 // macro metavariable edge cases. Synthetic parentheses (i.e. not appearing in