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

error: expected expression, found keyword `struct`
  --> $DIR/assert.rs:6:13
   |
LL |     assert!(struct);
   |             ^^^^^^ expected expression

error: macro requires a boolean expression as an argument
  --> $DIR/assert.rs:7:5
   |
LL |     debug_assert!();
   |     ^^^^^^^^^^^^^^^ boolean expression required
   |
   = note: this error originates in the macro `debug_assert` (in Nightly builds, run with -Z macro-backtrace for more info)

error: expected expression, found keyword `struct`
  --> $DIR/assert.rs:8:19
   |
LL |     debug_assert!(struct);
   |                   ^^^^^^ expected expression

error: aborting due to 4 previous errors