rust/tests/ui/cfg/disallowed-cli-cfgs.proc_macro_.stderr

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error: unexpected `--cfg proc_macro` flag
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= note: config `proc_macro` is only supposed to be controlled by `--crate-type proc-macro`
= note: manually setting a built-in cfg can and does create incoherent behaviors
= note: `#[deny(explicit_builtin_cfgs_in_flags)]` on by default
error: aborting due to 1 previous error