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Source file test/switch6.go

Documentation: test

     1  // errorcheck
     2  
     3  // Copyright 2016 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  // Check the compiler's switch handling that happens
     8  // at typechecking time.
     9  // This must be separate from other checks,
    10  // because errors during typechecking
    11  // prevent other errors from being discovered.
    12  
    13  package main
    14  
    15  // Verify that type switch statements with impossible cases are detected by the compiler.
    16  func f0(e error) {
    17  	switch e.(type) {
    18  	case int: // ERROR "impossible type switch case: e \(type error\) cannot have dynamic type int \(missing Error method\)"
    19  	}
    20  }
    21  
    22  // Verify that the compiler rejects multiple default cases.
    23  func f1(e interface{}) {
    24  	switch e {
    25  	default:
    26  	default: // ERROR "multiple defaults in switch"
    27  	}
    28  	switch e.(type) {
    29  	default:
    30  	default: // ERROR "multiple defaults in switch"
    31  	}
    32  }
    33  
    34  type I interface {
    35  	Foo()
    36  }
    37  
    38  type X int
    39  
    40  func (*X) Foo() {}
    41  func f2() {
    42  	var i I
    43  	switch i.(type) {
    44  	case X: // ERROR "impossible type switch case: i \(type I\) cannot have dynamic type X \(Foo method has pointer receiver\)"
    45  	}
    46  }
    47  

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