1error: #[proc_macro_error] attribute can be used only with procedural macros 2 3 = hint: if you are really sure that #[proc_macro_error] should be applied to this exact function, use #[proc_macro_error(allow_not_macro)] 4 5 --> $DIR/not_proc_macro.rs:3:1 6 | 73 | #[proc_macro_error] 8 | ^^^^^^^^^^^^^^^^^^^ 9 | 10 = note: this error originates in an attribute macro (in Nightly builds, run with -Z macro-backtrace for more info) 11