4 ms·
It's the View Patterns extension: https://ghc.haskell.org/trac/ghc/wiki/ViewPatterns https://ghc.haskell.org/trac/ghc/wiki/ViewPatterns
by dezgeg 12y ago
It's the View Patterns extension: https://ghc.haskell.org/trac/ghc/wiki/ViewPatterns https://ghc.haskell.org/trac/ghc/wiki/ViewPatterns