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(a*)* spins the matching engine forever #542

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hamishknight opened this issue Jul 5, 2022 · 2 comments · Fixed by #560
Closed

(a*)* spins the matching engine forever #542

hamishknight opened this issue Jul 5, 2022 · 2 comments · Fixed by #560

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@hamishknight
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hamishknight commented Jul 5, 2022 •
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Attempting to match the input "a" against the pattern (a*)* appears to spin the matching engine forever.

rdar://96461197
@hamishknight
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cc @milseman

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milseman commented Jul 5, 2022

This is a common/natural fall out of simple backtracking. We'll want to eventually have loop analysis over an IR to avoid it, but there might be a shorter term fix we can do.

@hamishknight hamishknight mentioned this issue Jul 7, 2022
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