Chris Willmore 02a6be6d01 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

2016-04-22 21:53:26 -07:00

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