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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 6e671c9efdc..169388d72b6 100644
--- a/src/libsyntax/lib.rs
+++ b/src/libsyntax/lib.rs
@@ -35,6 +35,7 @@
 #![feature(rustc_diagnostic_macros)]
 #![feature(specialization)]
 
+extern crate core;
 extern crate serialize;
 extern crate term;
 extern crate libc;