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