Handle capture variables in stripCapturing
#22288
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Given a capture set variable `C`, its `stripCapturing` should be just `CapSet`.
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Partly fixes #22103
Given a capture set variable
Cdefined withC <: CapSet^,TypeRef(C).stripCapturingpreviously does nothing, which is apparently wrong. For "normal" type variables there is not a problem since type variables are always pure, so stripping can do nothing for them. But this won't work for capture set variable.This PR fixes this behavior by stripping capture variables like
CtoCapSet.