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  • #595

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Opened Sep 17, 2003 by Simon Marlow@simonmar
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Overhaul GHC's overlapping/non-exhaustive pattern checking

GHC has a module in the desugarer (Check) which checks whether patterns are overlapping and/or exhaustive, to support the flags -fwarn-overlapping-patterns and -fwarn-non-exhaustive-patterns. The code is old and crufty, and has several outstanding bugs. A rewrite is needed.

Edited Mar 09, 2019 by Simon Marlow

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pattern match warnings P::normal task Trac import
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Reference: ghc/ghc#595