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Nicholas Nethercote
c12ab08c14
It's defined in `rustc_span::source_map` which doesn't make any sense because it has nothing to do with source maps. This commit moves it to the crate root, a more sensible spot for something this basic.
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: