REPL retry to replay failed inputs

[som-snytt]

If REPL gets :replay, please add :retry to replay failed inputs.

This is a Scala 2 example, but the idea is that a line doesn't compile with current options, and I'd like to retry it with different options. There are probably good Scala 3 examples with different -source settings.

scala> {
     | 1
     | +
     | 2
     | }
       +
       ^
On line 3: error: not found: value +

scala> :replay -Xsource:3
Nothing to replay.

[SethTisue]

Note that we don't have :settings in Scala 3 (as per #131) and :reset doesn't support passing settings, either, as in Scala 2.

[SethTisue]

(This seems a bit marginal to me as a feature request, since (in my experience anyway) most of the time you only have a single failed input and you can easily get to it with up-arrow.)

[som-snytt]

I agree that improved edit history makes this less useful.

Noting the OP with nothing to replay means you must set :settings then up-arrow. Empty replay doesn't set settings in scala 2.