[patch] Implement move semantics for iostreams

[Rainer Orth]

Hi Jonathan,

>>it does: {i386-pc, sparc-sun}-solaris2.1[01] bootstraps completed
>>successfully with it.
>
> Great. I hope the slightly-modified version I eventually checked in
> still works too :)

it does indeed, as just verified by a i386-pc-solaris2.11 bootstrap :-)

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University