Redundant variable assignments and indirect values

[felixSchl]

When looking into #40, I discovered this:

    const purs_any_t * b$$$ =
      NULL;;
    b$$$ =
      ({
        const purs_any_t * * $ivalue =
          purs_indirect_value_new();;
        const purs_any_t * $value =
          NULL;;
        purs_indirect_value_assign(
          $ivalue,
          $value
        );
        $value;
      });
    b$$$ =
      ({
        const purs_any_t * * $ivalue =
          purs_indirect_value_new();;
        const purs_any_t * $value =
          NULL;;
        purs_indirect_value_assign(
          $ivalue,
          $value
        );
        $value;
      });
    b$$$ =
      ({
        const purs_any_t * * $ivalue =
          purs_indirect_value_new();;
        const purs_any_t * $value =
          NULL;;
        purs_indirect_value_assign(
          $ivalue,
          $value
        );
        $value;
      });
    b$$$ =
      ({
        const purs_any_t * * $ivalue =
          purs_indirect_value_new();;
        const purs_any_t * $value =
          NULL;;
        purs_indirect_value_assign(
          $ivalue,
          $value
        );
        $value;
      });

Firstly, why is b'' ("b$$$") re-assigned over and over again and secondly, what is going on with the indirect variables here?

This does not appear to break anything, but is messy, causes unnecessary heap allocations, and should be removed.