Initial commit: Go 1.23 release state

test/defererrcheck.go

@@ -0,0 +1,86 @@
+// errorcheck -0 -l -d=defer
+
+// Copyright 2019 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.
+
+// check that open-coded defers are used in expected situations
+
+package main
+
+import "fmt"
+
+var glob = 3
+
+func f1() {
+
+	for i := 0; i < 10; i++ {
+		fmt.Println("loop")
+	}
+	defer func() { // ERROR "open-coded defer"
+		fmt.Println("defer")
+	}()
+}
+
+func f2() {
+	for {
+		defer func() { // ERROR "heap-allocated defer"
+			fmt.Println("defer1")
+		}()
+		if glob > 2 {
+			break
+		}
+	}
+	defer func() { // ERROR "stack-allocated defer"
+		fmt.Println("defer2")
+	}()
+}
+
+func f3() {
+	defer func() { // ERROR "stack-allocated defer"
+		fmt.Println("defer2")
+	}()
+	for {
+		defer func() { // ERROR "heap-allocated defer"
+			fmt.Println("defer1")
+		}()
+		if glob > 2 {
+			break
+		}
+	}
+}
+
+func f4() {
+	defer func() { // ERROR "open-coded defer"
+		fmt.Println("defer")
+	}()
+label:
+	fmt.Println("goto loop")
+	if glob > 2 {
+		goto label
+	}
+}
+
+func f5() {
+label:
+	fmt.Println("goto loop")
+	defer func() { // ERROR "heap-allocated defer"
+		fmt.Println("defer")
+	}()
+	if glob > 2 {
+		goto label
+	}
+}
+
+func f6() {
+label:
+	fmt.Println("goto loop")
+	if glob > 2 {
+		goto label
+	}
+	// The current analysis doesn't end a backward goto loop, so this defer is
+	// considered to be inside a loop
+	defer func() { // ERROR "heap-allocated defer"
+		fmt.Println("defer")
+	}()
+}