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7416c20cfd
Currently it uses a mixture of functional style (`flat_map`) and imperative style (`push`), which is a bit hard to read. This commit converts it to fully imperative, which is more concise and avoids the need for `smallvec`.
The rustc_ast crate contains those things concerned purely with syntax
– that is, the AST ("abstract syntax tree"), along with some definitions for tokens and token streams, data structures/traits for mutating ASTs, and shared definitions for other AST-related parts of the compiler (like the lexer and macro-expansion).
For more information about how these things work in rustc, see the rustc dev guide: