ssa: makeInterface check funcdecl => closure

cl/_testrt/funcdecl/in.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"unsafe"
+)
+
+func main() {
+	println("hello")
+	check(demo)
+}
+
+func check(fn func()) {
+	var a any = demo
+	var b any = fn
+	fn1 := a.(func())
+	fn2 := b.(func())
+	println(a, b, fn, fn1, fn2, demo)
+	println(closurePtr(a) == closurePtr(b))
+}
+
+func closurePtr(a any) unsafe.Pointer {
+	return (*rtype)(unsafe.Pointer(&a)).ptr.fn
+}
+
+type rtype struct {
+	typ unsafe.Pointer
+	ptr *struct {
+		fn  unsafe.Pointer
+		env unsafe.Pointer
+	}
+}
+
+func demo() {
+	println("demo")
+}