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cmd/compile: confusing error when using a keyword as package member #30039

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mvdan opened this issue Jan 31, 2019 · 2 comments

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@mvdan
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commented Jan 31, 2019

$ go version
go version devel +447965d4e0 Sun Jan 27 04:18:10 2019 +0000 linux/amd64
$ cat f.go
package p

import "go/types"

func _() {
        var _ types.const
}
$ go build f.go
# command-line-arguments
./f.go:6:8: cannot refer to unexported name types._
./f.go:6:14: syntax error: unexpected const, expecting name

Of course, here I fat-fingered the type and meant types.Const. I encountered this in a real program, and the types._ error had me confused for a second. I presume that the first of the two errors should not be printed, as the second error contains all the information the user needs.

Interestingly enough, seems like the go/* packages don't do a particularly better job here:

f.go:6:14: expected 'IDENT', found 'const'
f.go:6:14: _ not declared by package types
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commented Jan 31, 2019

Change https://golang.org/cl/160637 mentions this issue: cmd/compile: avoid confusing error on pkg.keyword

@mvdan

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commented Jan 31, 2019

Seemed easy enough, so I had a stab at this. I presume we should fix this in go/* as well, presumably go/parser.

@odeke-em odeke-em added this to the Go1.13 milestone Feb 3, 2019

@bcmills bcmills added the NeedsFix label Mar 1, 2019

@andybons andybons modified the milestones: Go1.13, Go1.14 Jul 8, 2019

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