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Diffstat (limited to '')
-rw-r--r-- | test/switch6.go | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/test/switch6.go b/test/switch6.go new file mode 100644 index 0000000..b9d9800 --- /dev/null +++ b/test/switch6.go @@ -0,0 +1,46 @@ +// errorcheck + +// Copyright 2016 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 the compiler's switch handling that happens +// at typechecking time. +// This must be separate from other checks, +// because errors during typechecking +// prevent other errors from being discovered. + +package main + +// Verify that type switch statements with impossible cases are detected by the compiler. +func f0(e error) { + switch e.(type) { + case int: // ERROR "impossible type switch case: (int\n\t)?e \(.*type error\) cannot have dynamic type int \(missing Error method\)" + } +} + +// Verify that the compiler rejects multiple default cases. +func f1(e interface{}) { + switch e { + default: + default: // ERROR "multiple defaults( in switch)?" + } + switch e.(type) { + default: + default: // ERROR "multiple defaults( in switch)?" + } +} + +type I interface { + Foo() +} + +type X int + +func (*X) Foo() {} +func f2() { + var i I + switch i.(type) { + case X: // ERROR "impossible type switch case: (X\n\t)?i \(.*type I\) cannot have dynamic type X \(Foo method has pointer receiver\)" + } +} |