[patch] Fix PR c++/10385: ICE on invalid dynamic_cast

[Mark Mitchell]

Volker Reichelt wrote:

> 2006-04-18  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
> 
> 	PR c++/10385
> 	* rtti.c (build_dynamic_cast_1): Check for invalid conversions
> 	before calling convert_to_reference.
> 	* cvt.c (convert_to_reference): Assert that reftype is a
> 	REFERENCE_TYPE.

This is OK, thanks.

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Mark Mitchell
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