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-rw-r--r--src/libstd/sys_common/gnu/libbacktrace.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstd/sys_common/gnu/libbacktrace.rs b/src/libstd/sys_common/gnu/libbacktrace.rs
index 75c6bd5d2a2..6ad3af6aee1 100644
--- a/src/libstd/sys_common/gnu/libbacktrace.rs
+++ b/src/libstd/sys_common/gnu/libbacktrace.rs
@@ -73,7 +73,7 @@ pub fn resolve_symname<F>(frame: Frame,
                 "failed to allocate libbacktrace state")
             )
         }
-        let mut data = ptr::null();
+        let mut data: *const libc::c_char = ptr::null();
         let data_addr = &mut data as *mut *const libc::c_char;
         let ret = unsafe {
             backtrace_syminfo(state,