Next: File, Previous: Extern, Up: Pseudo Ops [Contents][Index]

### 7.52 `.fail expression`

Generates an error or a warning. If the value of the expression is 500 or more, `as` will print a warning message. If the value is less than 500, `as` will print an error message. The message will include the value of expression. This can occasionally be useful inside complex nested macros or conditional assembly.