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go/test/fixedbugs/issue23586.go

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// 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 but 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"
}