Revert "internal/core/adt: carry over enclosing scope"
This reverts https://cuelang.org/cl/1214849,
as it broke two cuelang.org/docs guides as reported in #3924.
Fixes #3924.
Causes #3920 to reopen, as we are reverting the fix.
Signed-off-by: Daniel Martí <mvdan@mvdan.cc>
Change-Id: I61ed91546510bb519e2f19616ea928c318fcc6fb
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1215074
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Reviewed-by: Marcel van Lohuizen <mpvl@gmail.com>