error[E0432]: unresolved import `my_core` --> $DIR/extern-prelude-from-opaque-fail-2018.rs:21:9 | LL | use my_core; | ^^^^^^^ no external crate `my_core` error[E0432]: unresolved import `my_core` --> $DIR/extern-prelude-from-opaque-fail-2018.rs:8:13 | LL | use my_core; | ^^^^^^^ no external crate `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-2018.rs:12:18 | LL | fn f() { my_core::mem::drop(0); } | ^^^^^^^ use of undeclared crate or module `my_core` ... LL | a!(); | ---- in this macro invocation | = help: consider importing one of these items: std::mem core::mem = 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-2018.rs:25:14 | LL | fn f() { my_core::mem::drop(0); } | ^^^^^^^ use of undeclared crate or module `my_core` | help: consider importing one of these items | LL + use core::mem; | LL + use std::mem; | help: if you import `mem`, refer to it directly | LL - fn f() { my_core::mem::drop(0); } LL + fn f() { mem::drop(0); } | error: aborting due to 4 previous errors Some errors have detailed explanations: E0432, E0433. For more information about an error, try `rustc --explain E0432`.