Mentioning "class prvalues" is wrong, but should we really only consider glvalues here? [dcl.init.ref]/5.3 can use a conversion function to convert to a prvalue of any type, and appears to be a "binds directly" case (although the "binds directly" wording is unclear about which cases it applies to).

So should we say something like:

invocation of a conversion function for conversion in which a reference\iref{dcl.init.ref} will be directly bound\iref{over.match.ref}.

?

Updated.