c++/10661: [3.3/3.4? regression] ICE in instantiate_decl

[Wolfgang Bangerth]

> I have just finished a first small analysys. [...]
> Your code is illegal: within iterator_chain<>::_init(), line 69731 is
                                                               ^^^^^
> ill-formed:

You're incredible, man!

W.

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Wolfgang Bangerth              email:            bangerth@ices.utexas.edu
                               www: http://www.ices.utexas.edu/~bangerth/