d055d6ad5e
Use parent function WfCheckingContext to check RPITIT.
WF-check for RPITIT was done in the opaque type's param-env, so it could not benefit from assumed wf types from the function's parameters.
cc `@compiler-errors` since you chose that param-env in
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For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.