go source for verification 2026-05-22

test/fixedbugs/issue23586.go

@@ -0,0 +1,24 @@
+// errorcheck
+
+// Copyright 2018 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.
+
+// Test that we type-check deferred/go functions even
+// if they are not called (a common error). Specifically,
+// we don't want to see errors such as import or variable
+// declared and not used.
+
+package p
+
+import (
+	"fmt"
+	"math"
+)
+
+func f() {
+	var i int
+	defer func() { fmt.Println() } // ERROR "must be function call"
+	go func() { _ = math.Sin(0) }  // ERROR "must be function call"
+	go func() { _ = i}             // ERROR "must be function call"
+}