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-rw-r--r--src/libsyntax_ext/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libsyntax_ext/lib.rs b/src/libsyntax_ext/lib.rs
index da0f8ca6da0..7de90278ed7 100644
--- a/src/libsyntax_ext/lib.rs
+++ b/src/libsyntax_ext/lib.rs
@@ -12,6 +12,7 @@
 #![feature(decl_macro)]
 #![feature(nll)]
 #![feature(rustc_diagnostic_macros)]
+#![feature(unicode_internals)]
 
 #![recursion_limit="256"]