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From:
Shayne Fletcher
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GHC: How whitespace sensitive operator lexing works
https://blog.shaynefletcher.org/2020/04/ghc-how-whitespace-sensitive-operator.html
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ghc
In GHC, Haskell operator occurrences get classified into one of four categories. For example, the occurrence of ⊕ in a ⊕ b is "loose infix", in a⊕b is "tight infix", in a ⊕b is "prefix" and in a⊕ b, "suffix"
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