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-rw-r--r--src/libstd/lib.rs1
1 files changed, 0 insertions, 1 deletions
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index 8fe0ecfcf53..82262f1551a 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -303,7 +303,6 @@
 #![feature(stmt_expr_attributes)]
 #![feature(str_char)]
 #![feature(str_internals)]
-#![feature(str_mut_extras)]
 #![feature(str_utf16)]
 #![feature(test, rustc_private)]
 #![feature(thread_local)]