From 10cc4d27eec03b358c5e8cf4d093a19a9208676f Mon Sep 17 00:00:00 2001
From: Ivan Enderlin <ivan@mnt.io>
Date: Fri, 9 Oct 2020 14:51:53 +0200
Subject: [PATCH] feat(c-api) Implement `wasm_externtype_copy`.

---
 lib/c-api/src/wasm_c_api/types/extern_.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/lib/c-api/src/wasm_c_api/types/extern_.rs b/lib/c-api/src/wasm_c_api/types/extern_.rs
index 97692de73fb..1d7854d92f9 100644
--- a/lib/c-api/src/wasm_c_api/types/extern_.rs
+++ b/lib/c-api/src/wasm_c_api/types/extern_.rs
@@ -21,6 +21,16 @@ pub unsafe extern "C" fn wasm_extern_type(e: &wasm_extern_t) -> Box<wasm_externt
 #[no_mangle]
 pub unsafe extern "C" fn wasm_externtype_delete(_et: Option<Box<wasm_externtype_t>>) {}
 
+#[no_mangle]
+pub unsafe extern "C" fn wasm_externtype_copy(
+    wasm_externtype: &wasm_externtype_t,
+) -> Box<wasm_externtype_t> {
+    // do shallow copy
+    Box::new(wasm_externtype_t {
+        inner: wasm_externtype.inner.clone(),
+    })
+}
+
 impl From<ExternType> for wasm_externtype_t {
     fn from(other: ExternType) -> Self {
         Self { inner: other }