error: macro requires a boolean expression as an argument
  --> $DIR/assert.rs:2:5
   |
LL |     assert!();
   |     ^^^^^^^^^^ boolean expression required

error: expected expression, found keyword `struct`
  --> $DIR/assert.rs:3:13
   |
LL |     assert!(struct);
   |             ^^^^^^ expected expression

error: macro requires a boolean expression as an argument
  --> $DIR/assert.rs:4:5
   |
LL |     debug_assert!();
   |     ^^^^^^^^^^^^^^^^ boolean expression required
   |
   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error: expected expression, found keyword `struct`
  --> $DIR/assert.rs:5:19
   |
LL |     debug_assert!(struct);
   |                   ^^^^^^ expected expression

error: aborting due to 4 previous errors