main.go

     1  // run
     2  
     3  // Copyright 2019 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  // Do not panic on conversion to anonymous interface, which
     8  // is similar-looking interface types in different packages.
     9  
    10  package main
    11  
    12  import (
    13  	"fmt"
    14  
    15  	ssa1 "issue29612.dir/p1/ssa"
    16  	ssa2 "issue29612.dir/p2/ssa"
    17  )
    18  
    19  func main() {
    20  	v1 := &ssa1.T{}
    21  	_ = v1
    22  
    23  	v2 := &ssa2.T{}
    24  	ssa2.Works(v2)
    25  	ssa2.Panics(v2) // This call must not panic
    26  
    27  	swt(v1, 1)
    28  	swt(v2, 2)
    29  }
    30  
    31  //go:noinline
    32  func swt(i interface{}, want int) {
    33  	var got int
    34  	switch i.(type) {
    35  	case *ssa1.T:
    36  		got = 1
    37  	case *ssa2.T:
    38  		got = 2
    39  
    40  	case int8, int16, int32, int64:
    41  		got = 3
    42  	case uint8, uint16, uint32, uint64:
    43  		got = 4
    44  	}
    45  
    46  	if got != want {
    47  		panic(fmt.Sprintf("switch %v: got %d, want %d", i, got, want))
    48  	}
    49  }
    50
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