go source for verification 2026-05-22

test/tailcall.go

@@ -0,0 +1,29 @@
+// errorcheck -0 -d=tailcall=1
+
+// Copyright 2024 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 p
+
+// Test that when generating wrappers for methods, we generate a tail call to the pointer version of
+// the method, if that method is not inlineable. We use go:noinline here to force the non-inlineability
+// condition.
+
+//go:noinline
+func (f *Foo) Get2Vals() [2]int { return [2]int{f.Val, f.Val + 1} }
+func (f *Foo) Get3Vals() [3]int { return [3]int{f.Val, f.Val + 1, f.Val + 2} }
+
+type Foo struct{ Val int }
+
+type Bar struct { // ERROR "tail call emitted for the method \(\*Foo\).Get2Vals wrapper"
+	int64
+	*Foo // needs a method wrapper
+	string
+}
+
+var i any
+
+func init() {
+	i = Bar{1, nil, "first"}
+}