Richard T Bonhomme 17946f39b2
Improve select_vars() and source_vars()
Allow reuse of select_vars() by not also calling source_vars().

Minor improvement to error detection in source_vars().

Signed-off-by: Richard T Bonhomme <tincantech@protonmail.com>
2023-10-10 20:32:00 +01:00
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