error[E0152]: found duplicate lang item `owned_box`
  --> $DIR/E0152.rs:5:1
   |
LL | struct Foo<T>(T);
   | ^^^^^^^^^^^^^
   |
   = note: the lang item is first defined in crate `alloc` (which `std` depends on)
   = note: first definition in `alloc` loaded from SYSROOT/liballoc-*.rlib
   = note: second definition in the local crate (`E0152`)

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0152`.