| error[E0433]: failed to resolve: use of unresolved module or unlinked crate `alloc` | |
| --> $DIR/undeclared-module-alloc.rs:3:5 | |
| | | |
| LL | use alloc::rc::Rc; | |
| | ^^^^^ use of unresolved module or unlinked crate `alloc` | |
| | | |
| = help: add `extern crate alloc` to use the `alloc` crate | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0433`. |