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Commit 4c0c2287 authored by David's avatar David Committed by Sebastian Graf
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Implement Or Patterns (#22596) 


This commit introduces a new language extension, `-XOrPatterns`, as described in
GHC Proposal 522.

An or-pattern `pat1; ...; patk` succeeds iff one of the patterns `pat1`, ...,
`patk` succeed, in this order.

See also the summary `Note [Implmentation of OrPatterns]`.

Co-Authored-By: default avatarSebastian Graf <sgraf1337@gmail.com>
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