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Chris Willmore
38712ae277e
Chris Willmore committed 02a6be6d017
Allow parsing of function types in expr position (#2273)

Previously it was not possible to parse expressions of the form

    [Int -> Int]()

because no Expr could represent the '->' token and be converted later
into a FunctionTypeRepr. This commit introduces ArrowExpr which exists
solely to be converted to FunctionTypeRepr later by simplifyTypeExpr.

https://bugs.swift.org/browse/SR-502