Catch exception by rvalue reference?

Clause / Subclause / Annex: 
15.3
Para/Table/Figure: 
3
Comment type: 
Te
Comment / justification for change: 

A handler catching its parameter by rvalue-reference is syntactically valid, but will never be activated.

Recommended change: 

Disallow handlers catching by rvalue-reference.

MB: 
UK