error: an inner attribute is not permitted in this context
  --> $DIR/stmt_expr_attrs_placement.rs:7:13
   |
LL |     let a = #![allow(warnings)] (1, 2);
   |             ^^^^^^^^^^^^^^^^^^^
   |
   = note: inner attributes, like `#![no_std]`, annotate the item enclosing them, and are usually found at the beginning of source files. Outer attributes, like `#[test]`, annotate the item following them.

error: aborting due to previous error