fix error suggestion select if the object is enclosed in paren

[Onyad]

Reproduce

{lib, ...}: let
  fn = a: {
    b = 10;
  };
  u = (fn 10).<CURSOR FOR COMPLETION>;

  a = {
    x = 10;
  };
  b = (a).<CURSOR FOR COMPLETION>;
in {
}

there are no suggestions before the fix, after that there are suggestions

This is because there is no allocation in the crates/ide/src/def/lower.rs for the ast node Parent.

I do not know how best to solve this, so this is just a suggestion, perhaps it would be better to add an allocation for Paren.

[oxalica]

perhaps it would be better to add an allocation for Paren.

Thanks for the finding. Let's do this instead. There should be many other places relying on that every Expr AST node can be looked up.