error[E0432]: unresolved import `my_core` --> $DIR/extern-prelude-from-opaque-fail.rs:20:9 | LL | use my_core; | ^^^^^^^ no `my_core` in the root error[E0432]: unresolved import `my_core` --> $DIR/extern-prelude-from-opaque-fail.rs:7:13 | LL | use my_core; | ^^^^^^^ no `my_core` in the root ... LL | a!(); | ---- in this macro invocation | = note: this error originates in the macro `a` (in Nightly builds, run with -Z macro-backtrace for more info) error[E0433]: failed to resolve: use of undeclared crate or module `my_core` --> $DIR/extern-prelude-from-opaque-fail.rs:11:18 | LL | fn f() { my_core::mem::drop(0); } | ^^^^^^^ use of undeclared crate or module `my_core` ... LL | a!(); | ---- in this macro invocation | = note: this error originates in the macro `a` (in Nightly builds, run with -Z macro-backtrace for more info) error[E0433]: failed to resolve: use of undeclared crate or module `my_core` --> $DIR/extern-prelude-from-opaque-fail.rs:24:14 | LL | fn f() { my_core::mem::drop(0); } | ^^^^^^^ use of undeclared crate or module `my_core` error: aborting due to 4 previous errors Some errors have detailed explanations: E0432, E0433. For more information about an error, try `rustc --explain E0432`.