From 56c517d2654c6fa614f231295aa0668989ccb098 Mon Sep 17 00:00:00 2001
From: Nick Fitzgerald <fitzgen@gmail.com>
Date: Tue, 21 Jul 2020 09:39:04 -0700
Subject: [PATCH] examples: Add a GC call to the externref C example

---
 examples/externref.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/examples/externref.c b/examples/externref.c
index ded28bd072..4ec007ffa7 100644
--- a/examples/externref.c
+++ b/examples/externref.c
@@ -82,6 +82,9 @@ int main() {
   printf("Creating new `externref`...\n");
 
   // Create a new `externref` value.
+  //
+  // Note that if you need clean up for after the externref is reclaimed, you
+  // can use `wasmtime_externref_new_with_finalizer`.
   wasm_val_t externref;
   wasmtime_externref_new("Hello, World!", &externref);
   assert(externref.kind == WASM_ANYREF);
@@ -148,6 +151,11 @@ int main() {
   assert(results[0].kind == WASM_ANYREF);
   assert(wasm_ref_same(results[0].of.ref, externref.of.ref));
 
+  // We can GC any now-unused references to our externref that the store is
+  // holding.
+  printf("GCing within the store...\n");
+  wasmtime_store_gc(store);
+
   // Clean up after ourselves at this point
   printf("All finished!\n");
   ret = 0;