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