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This commit does the following. - Pulls the code out of `AttrTokenStream::to_token_trees` into a new function `attrs_and_tokens_to_token_trees`. - Simplifies `TokenStream::from_ast` by calling the new function. This is nicer than the old way, which created a temporary `AttrTokenStream` containing a single `AttrsTarget` (which required some cloning) just to call `to_token_trees` on it. (It is good to remove this use of `AttrsTarget` which isn't related to `cfg_attr` expansion.)
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: