[antlr-interest] Grammar inheritance problem

[Andrey Timoshenkov]

Hi All.

I have a trouble using ANTLR 2.7.5. I need 2 lexer grammars L1 and L2, 
where L2 inherits from L1 and I need to specify my own base class for 
resulting lexer. Below are simple examples:

L1.g:
--------------------------
options {
     language="Cpp";
}

class L1 extends Lexer("MyScanner");
options {
     k=2;
}

tokens {
     TOK1 = "abc";
}

NUM: '0'..'9';
---------------------------------

L2.g:
---------------------------------
options {
     language="Cpp";
}

class L2 extends L1("MyScanner");
options {
     k=2;
}

tokens {
     TOK2 = "def";
}

ID: ( 'a'..'z' ) ( 'a'..'z' | '0'..'9' )+;
---------------------------------

The second grammar fails due to the line:

	class L2 extends ("MyScanner");

in generated "expandedl2.g".

If I remove ("MyScanner") from L2 definition then ANTLR processes the 
grammar without errors but I lose inheritance from MyScanner.

Can somebody suggest a workaround?

Thank you in advance.
Andrey Timoshenkov, Ulter Systems Inc., Moscow, Russia.