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With this patch, we always parse f @t as a type application, thereby producing better error messages. This steals two syntactic forms: * Prefix form of the @-operator in expressions. Since the @-operator is a divergence from the Haskell Report anyway, this is not a major loss. * Prefix form of @-patterns. Since we are stealing loose infix form anyway, might as well sacrifice the prefix form for the sake of much better error messages.
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