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Re:C++ Pattern Matching Proposal [pdf] by macintux on Friday January 03, 2020 @01:03PM (#21948512)
There's some indirect discussion here that seems to contradict that, but I certainly could be wrong.

https://github.com/elm/compiler/issues/973

Re:C++ Pattern Matching Proposal [pdf] by Iceland_jack on Friday January 03, 2020 @01:21PM (#21948714)
That's in the context of Elm, Evan gives his reasons but in the context of Haskell such multi-line equations are very common and normal Haskell style.