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+error: macro-expanded `extern crate` items cannot shadow names passed with `--extern`
+ --> $DIR/extern-prelude-extern-crate-restricted-shadowing.rs:19:9
+ |
+LL | extern crate std as core;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^
+...
+LL | define_other_core!();
+ | -------------------- in this macro invocation
+ |
+ = note: this error originates in the macro `define_other_core` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0659]: `Vec` is ambiguous
+ --> $DIR/extern-prelude-extern-crate-restricted-shadowing.rs:13:9
+ |
+LL | Vec::panic!();
+ | ^^^ ambiguous name
+ |
+ = note: ambiguous because of a conflict between a macro-expanded name and a less macro-expanded name from outer scope during import or macro resolution
+note: `Vec` could refer to the crate imported here
+ --> $DIR/extern-prelude-extern-crate-restricted-shadowing.rs:5:9
+ |
+LL | extern crate std as Vec;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^
+...
+LL | define_vec!();
+ | ------------- in this macro invocation
+note: `Vec` could also refer to a struct from prelude
+ --> $SRC_DIR/std/src/prelude/mod.rs:LL:COL
+ = note: this error originates in the macro `define_vec` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0659`.