error[E0259]: the name `std` is defined multiple times
   |
   = note: `std` must be defined only once in the type namespace of this module
help: you can use `as` to change the binding name of the import
   |
LL | extern crate std as other_std;
   |

error: aborting due to previous error

For more information about this error, try `rustc --explain E0259`.