internal/core/adt: lets of comprehensions are multi lets
This fixes a regression of #2218 that was inadvertently
introduced in https://review.gerrithub.io/c/cue-lang/cue/+/551413/5/internal/core/adt/comprehension.go
Issue #2218
Signed-off-by: Marcel van Lohuizen <mpvl@gmail.com>
Change-Id: Ieccc37c794bfdba9381c441acc93894a528801fb
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/557097
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
authored by