1error: cannot find a built-in macro with name `unknown` 2 --> $DIR/unknown-builtin.rs:6:1 3 | 4LL | macro_rules! unknown { () => () } 5 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 6 7error[E0773]: attempted to define built-in macro more than once 8 --> $SRC_DIR/core/src/macros/mod.rs:LL:COL 9 | 10LL | / macro_rules! line { 11LL | | () => { 12LL | | /* compiler built-in */ 13LL | | }; 14LL | | } 15 | |_____^ 16 | 17note: previously defined here 18 --> $DIR/unknown-builtin.rs:9:1 19 | 20LL | macro_rules! line { () => () } 21 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 22 23error: aborting due to 2 previous errors 24 25For more information about this error, try `rustc --explain E0773`. 26