|  | 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 | 
|  |  |