Show overwritten vars when loop syntax fails

[k2tzumi]

It might be a good idea to always show the overwritten vars if the debug option was enabled

[k1LoW]

Is this when it fails? Or is this when the debug option is enabled?

[k2tzumi]

I see the following patterns.

1. When debugging is enabled
   Always show
2. If debugging fails with invalid
3. If debugging is enabled and fails

I am struggling with 1 or 2 above.
Would 1 be simpler in terms of letting the debugging option be utilized?

[k1LoW]

I don't think the overridden value is the only value we want when we fail. So 2 and 3 may not be suitable as use cases.

If we were to implement it, would it be 1. In that case, it is likely that the Capturer interface will need to be extended.

[k1LoW]

(For 2 and 3) When they fail, the number of values may be too large.

A good idea for a display would be useful.