src/test/ui/user-defined-macro-rules.stderr

error: user-defined macros may not be named `macro_rules`
  --> $DIR/user-defined-macro-rules.rs:13:1
   |
LL | macro_rules! macro_rules { () => {} } //~ ERROR user-defined macros may not be named `macro_rules`
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0601]: `main` function not found in crate `user_defined_macro_rules`
   |
   = note: consider adding a `main` function to `$DIR/user-defined-macro-rules.rs`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0601`.