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