Merge #306

306: Finish weird exprs r=DJMcNab a=DJMcNab

Fix #290.

Note that I'm not certain my use of `p.nth(1) == Ident` is entirely consistent with `libsyntax` - in the original, [`is_union_item`](https://github.com/rust-lang/rust/blob/9622f9dc4745eb59fd229477f453ae83e8044db9/src/libsyntax/parse/parser.rs#L4593-L4596) uses `t.is_ident() && !t.is_reserved_ident()`, whereas we effectively only do `is_ident`. However, I cannot find the definition of `is_reserved_ident` (even searching the rust repository only gives uses, no definitions), so this will have to do unless someone else can find it :|.

Co-authored-by: DJMcNab <[email protected]>

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