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-rw-r--r--src/libsyntax/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libsyntax/lib.rs b/src/libsyntax/lib.rs
index 8a66f0e6846..b18e3a221f9 100644
--- a/src/libsyntax/lib.rs
+++ b/src/libsyntax/lib.rs
@@ -19,6 +19,7 @@ This API is completely unstable and subject to change.
 */
 
 #![crate_id = "syntax#0.11.0-pre"]
+#![experimental]
 #![license = "MIT/ASL2"]
 #![crate_type = "dylib"]
 #![crate_type = "rlib"]