-- in.cue --
import "strings"
a: strings.Join( [ strings.Join(["1"]), "2" ], "\n") @test(err, code=eval, contains="not enough arguments in call to strings.Join", pos=[0:4, 0:20])

-- out/eval/stats --
Leaks:  0
Freed:  7
Reused: 0
Allocs: 7
Retain: 0

Unifications: 6
Conjuncts:    6
Disjuncts:    0
-- out/errors.txt --
[eval] a: error in call to strings.Join: not enough arguments in call to strings.Join (have 1, want 2):
    ./in.cue:2:4
    ./in.cue:2:20
