Parse unnamed struct/union type #1049
Description
Part of RFC 2102.
- RFC: Unnamed fields of struct and union type rust-lang/rfcs#2102
- Tracking issue: Tracking issue for RFC 2102, "Unnamed fields of struct and union type" rust-lang/rust#49804
- Example usage: https://github.com/rust-lang/rust/blob/e3c71f1e33b026dea7c9ca7c1c4554e63f56a0da/src/test/pretty/anonymous-types.rs
type A = struct { field: u8 };