From 7591df5172e9f8e80130b619b7eaa60846d3e851 Mon Sep 17 00:00:00 2001
From: David Rubin <daviru007@icloud.com>
Date: Tue, 16 Jul 2024 18:46:31 -0700
Subject: [PATCH] ip: use `getExternFunc` in `getCoerced` `ip.get` specifically
 doesn't allow `extern_func` keys to access it.

---
 src/InternPool.zig       |  5 ++---
 test/behavior/extern.zig | 13 +++++++++++++
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/src/InternPool.zig b/src/InternPool.zig
index 12492e0502..c3cee5852b 100644
--- a/src/InternPool.zig
+++ b/src/InternPool.zig
@@ -9433,12 +9433,11 @@ pub fn getCoerced(
     switch (ip.indexToKey(val)) {
         .undef => return ip.get(gpa, tid, .{ .undef = new_ty }),
         .extern_func => |extern_func| if (ip.isFunctionType(new_ty))
-            return ip.get(gpa, tid, .{ .extern_func = .{
+            return ip.getExternFunc(gpa, tid, .{
                 .ty = new_ty,
                 .decl = extern_func.decl,
                 .lib_name = extern_func.lib_name,
-            } }),
-
+            }),
         .func => unreachable,
 
         .int => |int| switch (ip.indexToKey(new_ty)) {
diff --git a/test/behavior/extern.zig b/test/behavior/extern.zig
index 9469b4dc21..cd80c545ce 100644
--- a/test/behavior/extern.zig
+++ b/test/behavior/extern.zig
@@ -45,3 +45,16 @@ test "function extern symbol matches extern decl" {
 export fn another_mystery_function() u32 {
     return 12345;
 }
+
+extern fn c_extern_function() [*c]u32;
+
+test "coerce extern function types" {
+    const S = struct {
+        export fn c_extern_function() [*c]u32 {
+            return null;
+        }
+    };
+    _ = S;
+
+    _ = @as(fn () callconv(.C) ?*u32, c_extern_function);
+}