public static LookupElement newFunctionLookup(String name, Function functionDecl) {
    final String presentation = functionDecl.buildSignature();
    final String returnType = functionDecl.getReturnType().getName();
    final boolean hasParams = functionDecl.getParameters().length > 0;
    return new FunctionLookup(name, presentation, returnType, hasParams);
  }
public static LookupElement newFunctionLookup(String name, Function functionDecl)