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Source file test/fixedbugs/bug491.go

Documentation: test/fixedbugs

  // run
  
  // Copyright 2014 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.
  
  // Test order of calls to builtin functions.
  // Discovered during CL 144530045 review.
  
  package main
  
  func main() {
  	// append
  	{
  		x := make([]int, 0)
  		f := func() int { x = make([]int, 2); return 2 }
  		a, b, c := append(x, 1), f(), append(x, 1)
  		if len(a) != 1 || len(c) != 3 {
  			bug()
  			println("append call not ordered:", len(a), b, len(c))
  		}
  	}
  
  	// cap
  	{
  		x := make([]int, 1)
  		f := func() int { x = make([]int, 3); return 2 }
  		a, b, c := cap(x), f(), cap(x)
  		if a != 1 || c != 3 {
  			bug()
  			println("cap call not ordered:", a, b, c)
  		}
  	}
  
  	// complex
  	{
  		x := 1.0
  		f := func() int { x = 3; return 2 }
  		a, b, c := complex(x, 0), f(), complex(x, 0)
  		if real(a) != 1 || real(c) != 3 {
  			bug()
  			println("complex call not ordered:", a, b, c)
  		}
  	}
  
  	// copy
  	{
  		tmp := make([]int, 100)
  		x := make([]int, 1)
  		f := func() int { x = make([]int, 3); return 2 }
  		a, b, c := copy(tmp, x), f(), copy(tmp, x)
  		if a != 1 || c != 3 {
  			bug()
  			println("copy call not ordered:", a, b, c)
  		}
  	}
  
  	// imag
  	{
  		x := 1i
  		f := func() int { x = 3i; return 2 }
  		a, b, c := imag(x), f(), imag(x)
  		if a != 1 || c != 3 {
  			bug()
  			println("imag call not ordered:", a, b, c)
  		}
  	}
  
  	// len
  	{
  		x := make([]int, 1)
  		f := func() int { x = make([]int, 3); return 2 }
  		a, b, c := len(x), f(), len(x)
  		if a != 1 || c != 3 {
  			bug()
  			println("len call not ordered:", a, b, c)
  		}
  	}
  
  	// make
  	{
  		x := 1
  		f := func() int { x = 3; return 2 }
  		a, b, c := make([]int, x), f(), make([]int, x)
  		if len(a) != 1 || len(c) != 3 {
  			bug()
  			println("make call not ordered:", len(a), b, len(c))
  		}
  	}
  
  	// real
  	{
  		x := 1 + 0i
  		f := func() int { x = 3; return 2 }
  		a, b, c := real(x), f(), real(x)
  		if a != 1 || c != 3 {
  			bug()
  			println("real call not ordered:", a, b, c)
  		}
  	}
  }
  
  var bugged = false
  
  func bug() {
  	if !bugged {
  		println("BUG")
  		bugged = true
  	}
  }

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