Probably not useful for the initial release but something to consider for later. This could be done three ways:

• add that information as a flag to the repl from construction
• pre-check the resolvers at extraction
• capture lazily instead of eagerly

The first two complicate resolution as it means resolve has to be duplicated to handle the None/Replacement cases separately, the latter probably just means constructing the capture once using OnceCell (/ LazyCell) instead of using a Capture parameter.

Later clarification for myself: this is about calling re.capture during extraction e.g.

::None and ::Replacement resolver variants have no need for the capture data, although that means resolve would need to be faillible. Then again, we could just expect/unwrap since by definition matching should only yield matching regexes, so captures should always succeed.