1 error[E0121]: the placeholder `_` is not allowed within types on item signatures for return types
4 LL | fn foo() -> _ { 5 }
7 | not allowed in type signatures
8 | help: replace with the correct return type: `i32`
10 error[E0121]: the placeholder `_` is not allowed within types on item signatures for static variables
11 --> $DIR/E0121.rs:3:13
13 LL | static BAR: _ = "test";
16 | not allowed in type signatures
17 | help: replace with the correct type: `&str`
19 error: aborting due to 2 previous errors
21 For more information about this error, try `rustc --explain E0121`.