Escaping dollar sign in a rule action

[mrsuh]

Hi!
Is there a way to pass the dollar sign from the grammar.y file to the parser output file without modification?
I want to do something like this:

grammar.y

%%
rule { \$this->var = $1; }
...
%%

parser

...
switch (yyn) {
    case 2: { $this->var = yystack.valueAt(0)); }
break;
...

I spent several hours on this and I think it's impossible.
Can you help me?