internal/core/adt: add tests for issue 3919
Issue #3919
Signed-off-by: Marcel van Lohuizen <mpvl@gmail.com>
Change-Id: Ibb70a600a7683ed5189cec98804add4336054e0e
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1214949
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>