internal/core/adt: add tests for 3931
Issue #3931
Issue #3919
Signed-off-by: Marcel van Lohuizen <mpvl@gmail.com>
Change-Id: I49983eeddc6cad4c24502e4b6a076617595a6a53
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1215498
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>