Emulate the Structure of Pattern Binding Conditions #729
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The expression parser has to go out of its way to parse all the way down to primary expressions before realizing that the expression pattern it was after isn't actually an expression pattern. This involves setting a bit of ambient state, that we have to plumb down expression parsing. This is pretty gross, but it emulates what the legacy parser was doing here. Fixes swiftlang#724 rdar://99669036
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The expression parser has to go out of its way to parse all the way down to primary expressions before realizing that the expression pattern it was after isn't actually an expression pattern. This involves setting a bit of ambient state, that we have to plumb down expression parsing.
This is pretty gross, but it emulates what the legacy parser was doing here.
Fixes #724
rdar://99669036