evaluator: error involving self-alias does not include problem line

[rogpeppe]

What version of CUE are you using (cue version)?

$ cue version
cue version v0.0.0-20230511092117-a670427406af

go version devel go1.21-3ed8a1e629 Tue Mar 28 05:41:44 2023 +0000
      -buildmode exe
       -compiler gc
  DefaultGODEBUG panicnil=1
     CGO_ENABLED 1
          GOARCH amd64
            GOOS linux
         GOAMD64 v1
             vcs git
    vcs.revision a670427406af7451da77cf477c0786d6f1b129c8
        vcs.time 2023-05-11T09:21:17Z
    vcs.modified false

Does this issue reproduce with the latest stable release?

Yes

What did you do?

! exec cue vet x.cue
stderr 'x\.cue:4:'

-- x.cue --
import "strconv"

a: #intlike
a: "235x5"

#intlike: x={
	string
	_#check: strconv.Atoi(x)
}

What did you expect to see?

A passing test.

What did you see instead?

> ! exec cue vet x.cue
[stderr]
a._#check: error in call to strconv.Atoi: strconv.Atoi: parsing "235x5": invalid syntax:
    ./x.cue:8:11
[exit status 1]
> stderr 'x\.cue:4:'
FAIL: /tmp/testscript3268229668/x.txtar/script.txtar:2: no match for `x\.cue:4:` found in stderr

The error that's printed does not point to the actual offending line of code.