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cmd/compile: wrong error "use of .(type) outside of type switch" if using undefined type #19977

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mvdan opened this issue Apr 14, 2017 · 2 comments
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cmd/compile: wrong error "use of .(type) outside of type switch" if using undefined type #19977

mvdan opened this issue Apr 14, 2017 · 2 comments
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
Milestone
Go1.9

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@mvdan
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mvdan commented Apr 14, 2017

What version of Go are you using (go version)?

Present in both tip and 1.8:

go version devel +7337181daf Fri Apr 14 08:44:45 2017 +0000 linux/amd64
go version go1.8.1 linux/amd64

What did you do?

Compile f.go:

package foo

func Foo(a bar) {
        switch x := a.(type) {
        default:
                _ = x
        }
}

What did you expect to see?

./f.go:3: undefined: bar

What did you see instead?

./f.go:3:12: undefined: bar
./f.go:4:15: use of .(type) outside type switch

Not urgent because the correct error is right above it, but this error is still wrong and unnecessary.
@mvdan
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mvdan commented Apr 14, 2017 •
edited

Slightly smaller repro:

package foo

func Foo() {
        switch x := a.(type) {
        default:
                _ = x
        }
}

./f.go:4: undefined: a
./f.go:4: use of .(type) outside type switch

@josharian josharian mentioned this issue Apr 30, 2017
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@bradfitz bradfitz added the NeedsFix The path to resolution is known, but the work has not been done. label Apr 30, 2017
@bradfitz bradfitz added this to the Go1.9 milestone Apr 30, 2017
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CL https://golang.org/cl/42210 mentions this issue.

@golang golang locked and limited conversation to collaborators Apr 30, 2018
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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Go1.9
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@bradfitz @mvdan @gopherbot