GAS: Can't seem to get "\@" to work from within macro

[Dao, Hai (AZ75)]

I can't seem to get the following GAS option to work:

        \@ as maintains a counter of how many macros it has executed in this
pseudo-variable; you can copy that number to your output with `\@', but only
within a macro     definition. 

To get \@ to evaluate, I had to enclose it in ""s ("\@").  Looking at the
listing file of the failed assemble runs, I can see that the \@ variable is
evaluating but the thing just won't assemble correctly.

Here are some things I've tried:
        --------------------------------------------------------------
                        .macro  loop
        L"\@":  const GR80, 0x0000
                .endm

                        loop
                        loop
        --------------------------------------------------------------
                        .macro  loop
        L .set "\@":    const GR80, 0x0000
                .endm

                        loop
                        loop
        --------------------------------------------------------------
                        .macro  loop
        L="\@": const GR80, 0x0000
                .endm

                        loop
                        loop
        --------------------------------------------------------------
                        .macro  loop
                        const GR80, "\@"
                .endm
                                                        <== You would think
that something as simple as this would assemble -- NOPE!
                        loop
                        loop
        --------------------------------------------------------------

Is this a bug or am I not doing something right?

Hai Dao
Honeywell
Central Technical Operations
ASIC Center of Excellence
21111 N. 19th Ave
Phoenix, AZ 85027
M/S AZ75-N28D3
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