error[E0252]: the name `mem` is defined multiple times
  --> $DIR/use-paths-as-items.rs:7:5
   |
LL | use std::{mem, ptr};
   |           --- previous import of the module `mem` here
LL | use std::mem;
   |     ^^^^^^^^ `mem` reimported here
   |
   = note: `mem` must be defined only once in the type namespace of this module

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0252`.