Generalize "InVarOrLetPattern" to "PatternContext" #859
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The legacy parser maintains a stack of contexts that determine whether a matching pattern is being parsed, and whether a let or var is the introducer. This turns on and off a particular production in expression parsing that helps to meld patterns like `Optional<String>.none` into shape depending on whether it comes after the keyword "case" or after "let" or "var".
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@swift-ci test |
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The legacy parser maintains a stack of contexts that determine whether a matching pattern is being parsed, and whether a let or var is the introducer. This turns on and off a particular production in expression parsing that helps to meld patterns like
Optional<String>.noneinto shape depending on whether it comes after the keyword "case" or after "let" or "var".