test: add test for unused calls to builtin functions
R=gri
CC=golang-dev
https://golang.org/cl/6871054
diff --git a/test/fixedbugs/issue4463.go b/test/fixedbugs/issue4463.go
new file mode 100644
index 0000000..578173a
--- /dev/null
+++ b/test/fixedbugs/issue4463.go
@@ -0,0 +1,87 @@
+// errorcheck
+
+// Copyright 2012 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.
+
+// Issue 4463: test builtin functions in statement context and in
+// go/defer functions.
+
+package p
+
+import "unsafe"
+
+func F() {
+ var a []int
+ var c chan int
+ var m map[int]int
+ var s struct{ f int }
+
+ append(a, 0) // ERROR "not used"
+ cap(a) // ERROR "not used"
+ complex(1, 2) // ERROR "not used"
+ imag(1i) // ERROR "not used"
+ len(a) // ERROR "not used"
+ make([]int, 10) // ERROR "not used"
+ new(int) // ERROR "not used"
+ real(1i) // ERROR "not used"
+ unsafe.Alignof(a) // ERROR "not used"
+ unsafe.Offsetof(s.f) // ERROR "not used"
+ unsafe.Sizeof(a) // ERROR "not used"
+
+ close(c)
+ copy(a, a)
+ delete(m, 0)
+ panic(0)
+ print("foo")
+ println("bar")
+ recover()
+
+ (close(c))
+ (copy(a, a))
+ (delete(m, 0))
+ (panic(0))
+ (print("foo"))
+ (println("bar"))
+ (recover())
+
+ go append(a, 0) // ERROR "not used"
+ go cap(a) // ERROR "not used"
+ go complex(1, 2) // ERROR "not used"
+ go imag(1i) // ERROR "not used"
+ go len(a) // ERROR "not used"
+ go make([]int, 10) // ERROR "not used"
+ go new(int) // ERROR "not used"
+ go real(1i) // ERROR "not used"
+ go unsafe.Alignof(a) // ERROR "not used"
+ go unsafe.Offsetof(s.f) // ERROR "not used"
+ go unsafe.Sizeof(a) // ERROR "not used"
+
+ go close(c)
+ go copy(a, a)
+ go delete(m, 0)
+ go panic(0)
+ go print("foo")
+ go println("bar")
+ go recover()
+
+ defer append(a, 0) // ERROR "not used"
+ defer cap(a) // ERROR "not used"
+ defer complex(1, 2) // ERROR "not used"
+ defer imag(1i) // ERROR "not used"
+ defer len(a) // ERROR "not used"
+ defer make([]int, 10) // ERROR "not used"
+ defer new(int) // ERROR "not used"
+ defer real(1i) // ERROR "not used"
+ defer unsafe.Alignof(a) // ERROR "not used"
+ defer unsafe.Offsetof(s.f) // ERROR "not used"
+ defer unsafe.Sizeof(a) // ERROR "not used"
+
+ defer close(c)
+ defer copy(a, a)
+ defer delete(m, 0)
+ defer panic(0)
+ defer print("foo")
+ defer println("bar")
+ defer recover()
+}
