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cmd/compile: "invalid variable name x in type switch", where x is a name of a constant #12413

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o948 opened this issue Aug 31, 2015 · 3 comments
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cmd/compile: "invalid variable name x in type switch", where x is a name of a constant #12413

o948 opened this issue Aug 31, 2015 · 3 comments
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Go1.6

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@o948
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o948 commented Aug 31, 2015

The following program fails to build (http://play.golang.org/p/qrVKDN_MDR):

package main

const x = 42

func main() {
    switch x := interface{}(nil).(type) {
    default:
        _ = x
    }
}

with the error message:

prog.go:6: invalid variable name x in type switch
@ianlancetaylor ianlancetaylor changed the title go/gc: "invalid variable name x in type switch", where x is a name of a constant cmd/compile: "invalid variable name x in type switch", where x is a name of a constant Aug 31, 2015
@ianlancetaylor ianlancetaylor added this to the Go1.6 milestone Aug 31, 2015
@ianlancetaylor
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Compiler bug rejecting a valid program. Works with gccgo.

@anthonycanino1
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Have an idea with what is wrong: Looks like x in the type switch grabs the const x symbol during parsing, which gives it the OLITERAL op that then errors in the type switch. Looking into a fix.

@gopherbot
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CL https://golang.org/cl/15760 mentions this issue.

@minux minux closed this as completed in b60c820 Oct 21, 2015
@golang golang locked and limited conversation to collaborators Oct 24, 2016
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@ianlancetaylor @o948 @gopherbot @anthonycanino1