private STGroup loadTemplatesHelper(boolean reportErrorIfFail) {
		String language = getLanguage();
		String groupFileName = CodeGenerator.TEMPLATE_ROOT + "/" + language + "/" + language + STGroup.GROUP_FILE_EXTENSION;
		try {
			return new STGroupFile(groupFileName);
		}
		catch (IllegalArgumentException iae) {
			if (reportErrorIfFail) {
				gen.tool.errMgr.toolError(ErrorType.MISSING_CODE_GEN_TEMPLATES, iae, getLanguage());
			}
			return null;
		}
	}
How many bits should be used to do inline token type tests? Java assumes
 a 64-bit word for bitsets.  Must be a valid wordsize for your target like
 8, 16, 32, 64, etc...

 @since 4.5
tool/src/org/antlr/v4/codegen/Target.java