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      1 // run
      2 
      3 // Copyright 2012 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 // Issue 4518. In some circumstances "return F(...)"
      8 // where F has multiple returns is miscompiled by 6g due to
      9 // bold assumptions in componentgen.
     10 
     11 package main
     12 
     13 //go:noinline
     14 func F(e interface{}) (int, int) {
     15 	return 3, 7
     16 }
     17 
     18 //go:noinline
     19 func G() (int, int) {
     20 	return 3, 7
     21 }
     22 
     23 func bogus1(d interface{}) (int, int) {
     24 	switch {
     25 	default:
     26 		return F(d)
     27 	}
     28 	return 0, 0
     29 }
     30 
     31 func bogus2() (int, int) {
     32 	switch {
     33 	default:
     34 		return F(3)
     35 	}
     36 	return 0, 0
     37 }
     38 
     39 func bogus3(d interface{}) (int, int) {
     40 	switch {
     41 	default:
     42 		return G()
     43 	}
     44 	return 0, 0
     45 }
     46 
     47 func bogus4() (int, int) {
     48 	switch {
     49 	default:
     50 		return G()
     51 	}
     52 	return 0, 0
     53 }
     54 
     55 func check(a, b int) {
     56 	if a != 3 || b != 7 {
     57 		println(a, b)
     58 		panic("a != 3 || b != 7")
     59 	}
     60 }
     61 
     62 func main() {
     63 	check(bogus1(42))
     64 	check(bogus2())
     65 }
     66