internal/core/adt: add exists builtin func
#2606
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exists(expr) :: bool (optional) `exists` reports whether expr resolves to any value. Signed-off-by: Artem V. Navrotskiy <bozaro@yandex.ru>
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This PR implements
existsbuildin func from #943 proposal.exists(expr) :: bool (optional)
existsreports whether expr resolves to any value.Motivation: replaces
if a.foo != _|_ {field exists check without hiding the underlying error.