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7d30472180
There are better ways to create the meta items. - In the rustdoc tests, the commit adds `dummy_meta_item_name_value`, which matches the existing `dummy_meta_item_word` function and `dummy_meta_item_list` macro. - In `types.rs` the commit clones the existing meta item and then modifies the clone.
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: