error: malformed `global_allocator` attribute input
  --> $DIR/allocator-args.rs:10:1
   |
LL | #[global_allocator(malloc)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
help: must be of the form
   |
LL - #[global_allocator(malloc)]
LL + #[global_allocator]
   |

error: aborting due to 1 previous error