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cmd/compile: autotmp_NNNN variable name in compiler error output #11737

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willfaught opened this issue Jul 16, 2015 · 3 comments
Closed

cmd/compile: autotmp_NNNN variable name in compiler error output #11737

willfaught opened this issue Jul 16, 2015 · 3 comments
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Go1.6

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@willfaught
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Write code like this:

func F(middleware interface{}) {
    switch middleware {
    case tigertonic.JSONLogged:
        [...]

and get a compiler error like this:

$ go build
# [...]/server
./middleware.go:69: invalid operation: autotmp_0210 == "github.com/rcrowley/go-tigertonic".JSONLogged (operator == not defined on func)
./middleware.go:73: invalid operation: autotmp_0210 == "github.com/rcrowley/go-tigertonic".Logged (operator == not defined on func)

I'm guessing auto-generated variable names aren't meant to be exposed outside the compiler?
@ianlancetaylor
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Which version of Go?

Can you please provide a small, complete, standalone example? That will take less total time than us guessing to try to create a complete example from your code fragment. Thanks.

@ianlancetaylor ianlancetaylor added this to the Go1.6 milestone Jul 16, 2015
@ebfe
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ebfe commented Jul 18, 2015

go version devel +aadd84e Sat Jul 18 01:35:25 2015 +0000 linux/amd64

package main

func f() {}

func s(x interface{}) {
        switch x {
        case f:
        }
}

func main() {
        s(f)
}

./t.go:7: invalid operation: autotmp_0000 == f (operator == not defined on func)

@ianlancetaylor ianlancetaylor changed the title cmd/go: autotmp_NNNN variable name in compiler error output cmd/compile: autotmp_NNNN variable name in compiler error output Jul 18, 2015
@gopherbot
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CL https://golang.org/cl/17816 mentions this issue.

@rsc rsc closed this as completed in 63a6f30 Dec 16, 2015
@golang golang locked and limited conversation to collaborators Dec 29, 2016
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@willfaught @ebfe @ianlancetaylor @gopherbot