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error: #[proc_macro_error] attribute can be used only with procedural macros
= hint: if you are really sure that #[proc_macro_error] should be applied to this exact function, use #[proc_macro_error(allow_not_macro)]
--> tests/ui/not_proc_macro.rs:3:1
|
3 | #[proc_macro_error]
| ^^^^^^^^^^^^^^^^^^^
|
= note: this error originates in the attribute macro `proc_macro_error` (in Nightly builds, run with -Z macro-backtrace for more info)