cmd/compile: don't optimize away a panicing interface comparison

We can't do direct pointer comparisons if the type is not a
comparable type.

Fixes #76008

Change-Id: I1687acff21832d2c2e8f3b875e7b5ec125702ef3
Reviewed-on: https://go-review.googlesource.com/c/go/+/713840
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/test/fixedbugs/issue76008.go b/test/fixedbugs/issue76008.go
new file mode 100644
index 0000000000..bdf273bca1
--- /dev/null
+++ b/test/fixedbugs/issue76008.go
@@ -0,0 +1,35 @@
+// run
+
+// Copyright 2025 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import "runtime"
+
+func main() {
+	shouldPanic(func() {
+		g = any(func() {}) == any(func() {})
+	})
+	shouldPanic(func() {
+		g = any(map[int]int{}) == any(map[int]int{})
+	})
+	shouldPanic(func() {
+		g = any([]int{}) == any([]int{})
+	})
+}
+
+var g bool
+
+func shouldPanic(f func()) {
+	defer func() {
+		err := recover()
+		if err == nil {
+			_, _, line, _ := runtime.Caller(2)
+			println("did not panic at line", line+1)
+		}
+	}()
+
+	f()
+}