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-rw-r--r--src/libstd/rt/backtrace.rs3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libstd/rt/backtrace.rs b/src/libstd/rt/backtrace.rs
index 80493ebb4a9..c003e08740d 100644
--- a/src/libstd/rt/backtrace.rs
+++ b/src/libstd/rt/backtrace.rs
@@ -415,6 +415,9 @@ mod imp {
                           errnum: libc::c_int);
         enum backtrace_state {}
         #[link(name = "backtrace", kind = "static")]
+        #[cfg(not(test))]
+        extern {}
+
         extern {
             fn backtrace_create_state(filename: *const libc::c_char,
                                       threaded: libc::c_int,