--- /dev/null
+error[E0659]: `core` is ambiguous (name vs any other name during import resolution)
+ --> $DIR/issue-57539.rs:4:9
+ |
+LL | use core; //~ ERROR `core` is ambiguous
+ | ^^^^ ambiguous name
+ |
+ = note: `core` could refer to a built-in extern crate
+ = help: use `::core` to refer to this extern crate unambiguously
+note: `core` could also refer to the module imported here
+ --> $DIR/issue-57539.rs:5:9
+ |
+LL | use crate::*;
+ | ^^^^^^^^
+ = help: use `self::core` to refer to this module unambiguously
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0659`.