### 7.1 `.abort`

This directive stops the assembly immediately. It is for compatibility with other assemblers. The original idea was that the assembly language source would be piped into the assembler. If the sender of the source quit, it could use this directive tells `as` to quit also. One day `.abort` will not be supported.

### 7.2 `.ABORT`

When producing COFF output, as accepts this directive as a synonym for .abort.

When producing `b.out` output, as accepts this directive, but ignores it.