1 files changed, 12 insertions, 0 deletions
diff --git a/test cases/rust/14 external libm/rs_math.rs b/test cases/rust/14 external libm/rs_math.rs
new file mode 100644
index 0000000..ef53a5c
--- /dev/null
+++ b/test cases/rust/14 external libm/rs_math.rs
@@ -0,0 +1,12 @@
+#![crate_name = "rs_math"]
+
+use std::os::raw::c_double;
+
+extern "C" {
+    fn log2(n: c_double) -> c_double;
+}
+
+#[no_mangle]
+pub extern fn rs_log2(n: c_double) -> c_double {
+    unsafe { log2(n) }
+}