docs: @Override
  	protected TypeReference getProposalProviderClass(Grammar grammar) {
  		final String simpleName = GrammarUtil.getSimpleName(grammar);
  		if (XTEND_GRAMMAR_NAME.equals(simpleName)) {
  			return new TypeReference(XTEND_PROPOSAL_PROVIDER);
  		}
  		return super.getProposalProviderClass(grammar);
  	}