(compile): With prefix arg, prompt even if (not compilation-read-command).
(compilation-error-regexp-alist): Make first regexp match column numbers too. Remove regexp for "prog:file:line: error". Replace GNAT 1.82 regexp with "prog: file:line\(:col\)?: error". (compilation-parse-errors): If spec has a column subexpr, but it was optional and didn't match, ignore it.
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