Fix pattern matching edge cases #65
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The grammar defined `guard let something: Type = ...` as legal, but only for the binding pattern case `guard let`. The `case` form, `guard case let`, should be allowed to have those too.
Although `for let foo = ...` requires a `case` before the `let`, the equivalent `var` does not. The easiest solve here is to make the `case` optional for anything other than an explicit case pattern.
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for varwithoutcase