From 35b750ab9a9c4e70e80c4a795e9f51d9f83ee6fc Mon Sep 17 00:00:00 2001
From: Nick Fitzgerald <fitzgen@gmail.com>
Date: Thu, 21 Jul 2022 16:16:23 -0700
Subject: [PATCH] Implement `std::fmt::Pointer` for `ExternRef` (#4504)

---
 crates/runtime/src/externref.rs | 6 ++++++
 crates/wasmtime/src/ref.rs      | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/crates/runtime/src/externref.rs b/crates/runtime/src/externref.rs
index 9477acd4fd65..4da7cc55d105 100644
--- a/crates/runtime/src/externref.rs
+++ b/crates/runtime/src/externref.rs
@@ -165,6 +165,12 @@ use wasmtime_environ::StackMap;
 #[repr(transparent)]
 pub struct VMExternRef(NonNull<VMExternData>);
 
+impl std::fmt::Pointer for VMExternRef {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        std::fmt::Pointer::fmt(&self.0, f)
+    }
+}
+
 // Data contained is always Send+Sync so these should be safe.
 unsafe impl Send for VMExternRef {}
 unsafe impl Sync for VMExternRef {}
diff --git a/crates/wasmtime/src/ref.rs b/crates/wasmtime/src/ref.rs
index f999b96d80a2..7845a4f7ea7d 100644
--- a/crates/wasmtime/src/ref.rs
+++ b/crates/wasmtime/src/ref.rs
@@ -100,3 +100,9 @@ impl ExternRef {
         externref_ptr as usize
     }
 }
+
+impl std::fmt::Pointer for ExternRef {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        std::fmt::Pointer::fmt(&self.inner, f)
+    }
+}