ARM Assembler v5.1.8 and the $defined() built-in function for conditional compilation

I am trying to convert a GNU assembly file to the TI assembler for arm. For some reason, the built-in function "$defined()" is giving me trouble. Right now, I am just trying to assemble a very basic file that only contains a single declaration surround by an .if statement:

        .if $defined(ABCD)
id      .cstring "Hello"
        .endif

The assembler outputs the following.

$ bin/armasm.exe test.asm
"test.asm", ERROR! at line 4: [E0004] Absolute, well-defined integer value
 expected
 .if $defined(ABCD)

"test.asm", ERROR! at line 4: [E0003] Unexpected trailing operand(s)
 .if $defined(ABCD)

"test.asm", ERROR! at EOF: [E0300] The following symbols are undefined:
 $defined
3 Assembly Errors, No Assembly Warnings

Errors in Source - Assembler Aborted

Can anybody help me figure this out? This construct is clearly supported by the compiler, per the example on page 98 in the User's Manual: http://www.ti.com/lit/ug/spnu118l/spnu118l.pdf

Thanks,

Jim

SOLUTION:

OK, so I added an extra $ to the beginning of $defined, and it works! Is the manual wrong, or is this just some convention I'm unaware of?

        .if $$defined(ABCD)
id      .cstring "Hello"
        .endif