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Fixes #10671 The `-Zunpretty=identified` option (without `expanded`) is effectively useless because `NodeId`s are unassigned prior to macro expansion, leading them to just be `NodeId::MAX_AS_U32`. This commit removes the `Identified` variant from `PpSourceMode` and removes `-Zunpretty=identified` from the command-line options. Users should use `-Zunpretty=expanded,identified` instead (which is retained) if they want to inspect `NodeId`s.
The driver crate is effectively the "main" function for the rust
compiler. It orchestrates the compilation process and "knits together"
the code from the other crates within rustc. This crate itself does
not contain any of the "main logic" of the compiler (though it does
have some code related to pretty printing or other minor compiler
options).
For more information about how the driver works, see the rustc dev guide.