1 error[E0742]: visibilities can only be restricted to ancestor modules
2 --> $DIR/relative-2018.rs:7:12
4 LL | pub(in ::core) struct S4;
7 error: relative paths are not supported in visibilities in 2018 edition or later
8 --> $DIR/relative-2018.rs:9:12
10 LL | pub(in a::b) struct S5;
13 | help: try: `crate::a::b`
15 error: aborting due to 2 previous errors
17 For more information about this error, try `rustc --explain E0742`.