Re: One year of Go

[Andrei Alexandrescu]

On 11/12/10 10:33 AM, bearophile wrote:

Steven Schveighoffer:

If that is invalid code, then I stand corrected.  If it compiles, then
it's a serious flaw that is inexcusable.

You need more time to try it on the site that Walter thinks is useless:
http://ideone.com/Ju80U

This Go code:

package main

import "fmt"

func main() {
   x := 5
   if(x == 6)
   {
     x++;
   }
   fmt.Printf("%d\n", x)
}


Produces this compilation error (gc-2010-07-14):
prog.go:7: x == 6 not used

The interactive compiler on the Go site produces the same outcome:
http://golang.org/

Bye,
bearophile

Try this then:

package main

import "fmt"

func blah() bool {
   return false
}

func main() {
  x := 5
  if(blah())
  {
    x++;
  }
  fmt.Printf("%d\n", x)
}

which evaluates x++ and prints 6 regardless of blah's result.

Ouch.

So Sean was right - it _did_ take him five minutes to find a fatal flaw.


Andrei