error: an inner attribute is not permitted in this context
  --> $DIR/issue-45296.rs:4:5
   |
LL |     #![allow(unused_variables)]
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
LL |     fn foo() {}
   |     ----------- the inner attribute doesn't annotate this function
   |
   = note: inner attributes, like `#![no_std]`, annotate the item enclosing them, and are usually found at the beginning of source files
help: to annotate the function, change the attribute from inner to outer style
   |
LL -     #![allow(unused_variables)]
LL +     #[allow(unused_variables)]
   |

error: aborting due to 1 previous error