cmd/go: promote -fullpath from test flag to build flag #60451
Description
What version of Go are you using (go version)?
f90b4cd6554f4f20280aa5229cf42650ed47221d
Does this issue reproduce with the latest release?
N/A
What did you do?
I ran this testscript:
! exec go test -C ./x -fullpath .
! stderr '\./x.go'
-- x/x.go --
package foo
var x = mistake
-- go.mod --
module test
What did you expect to see?
A passing test.
What did you see instead?
> ! exec go test -C ./x -fullpath .
[stdout]
FAIL
[stderr]
# test/x
./x.go:3:9: undefined: mistake
[exit status 1]
> ! stderr '\./x.go'
FAIL: /tmp/testscript142857279/x.txtar/script.txtar:2: unexpected match for `\./x.go` found in stderr: ./x.go
It seems to me that the intent of -fullpath is to cause all filenames to print in a way that's absolute, even when those errors come from the compiler rather than the test binary. I'd expect the compiler error to print an absolute path there too.