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Geth rakudo/main: 5697a5ac08 | (Elizabeth Mattijsen)++ | src/Raku/ast/regex.rakumod
RakuAST: make an empty regex not die in a horrible way

Well, not completely empty. For instance: / :i / is an empty regex because it only consists of a modifier. In the legacy grammar this will always just match anything (even the empty string).
In RakuAST, prior to this commit, it would just die horribly because it tried to create NFAs out of a Nil value. This commit restores the legacy behaviour (at least for now), so that other checks may be able to add worries or sorries about this situation.
12:59
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