error generate cpp lexer

[heruhday]

I tried to generate cpp lexer from https://github.com/antlr/grammars-v4/blob/master/cpp/pom.xml, but have a error like: error: expected {, found throw I think the problem is throw because rust not using throw new like java or C# for error handling.

 --> src\cpp\cpp14parser.rs:23478:64
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23478	.val { it.get_text() } else { "null" } .compareTo("0")!=0) throw new InputMismatchException(this);	^^^^^ expected {

note: the if expression is missing a block after this condition --> src\cpp\cpp14parser.rs:23477:6	23477	if(if let Some(it) = &(cast::<_,PureSpecifierContext >(&*_localctx))	___^ 23478		.val { it.get_text() } else { "null" } .compareTo("0")!=0) throw new InputMismatchException(this);		___^ help: try placing this code inside a block
23478	.val { it.get_text() } else { "null" } .compareTo("0")!=0) { throw } new InputMismatchException(this);
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