10689: Handle pub tuple fields in tuple structs r=Veykril a=adamrk The current implementation will throw a parser error for tuple structs that contain a pub tuple field. For example, ```rust struct Foo(pub (u32, u32)); ``` is valid Rust, but rust-analyzer will throw a parser error. This is because the parens after `pub` is treated as a visibility context. Allowing a tuple type to follow `pub` in the special case when we are defining fields in a tuple struct can fix the issue. I guess this is a really minor case because there's not much reason for having a tuple type within a struct tuple, but it is valid rust syntax... Co-authored-by: Adam Bratschi-Kaye <ark.email@gmail.com>
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