It seems that the Lexer rules are not validated if they exist or not.
I have simplified the grammar to show the issue:
If you use a parser rule that doesn't exist, the VS2010 plug-in
complains but if it's a Lexer rule, not only it doesn't complain, but
it generated the Lexer+Parser and it compiles with no errors.
In the following sample LexerRule doesn't exist.
grammar TestGrammar;
options {
language=CSharp3;
TokenLabelType=CommonToken;
output=AST;
ASTLabelType=CommonTree;
}
public compileUnit: parserRule EOF;
parserRule: LexerRule;
LEXERRULE2: 'VALUE';
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