gc: unused variable bound to closure not recognized #17968

stjj89 · 2016-11-17T20:17:52Z

gc accepts the following snippet of code, but gccgo and go/types report that: "x declared but not used":

func myfunc() {
  var x int
  go func() {
    x = 3
  }()
}

gccgo and go/types are probably correct here. x is only ever assigned to, but never returned or used.

If I make x a return value, none of one of gc, gccgo, and go/types complain.

func myfunc() {
  var x int
  go func() int {
    x = 3
    return x
  }()
}

ianlancetaylor · 2016-11-17T20:24:30Z

Dup of #8560.

ianlancetaylor closed this as completed Nov 17, 2016

golang locked and limited conversation to collaborators Nov 17, 2017

gopherbot added the FrozenDueToAge label Nov 17, 2017

Provide feedback