Daniel Krügler wrote:

> Germán Diago Gómez wrote:
>
> SFINAE causes a *silent* failure during an *attempt* to instantiate
> a template. The only template here is tuple_for_each_helper which
> was already instantiated, before the actual failure could take
> place.

Usage of bad language on my side: SFINAE's power occurs during the
attempt of template argument substituition. Failing substitution
leads to failing argument deduction and this again prevents template
successful instantiation.

Greetings from Bremen,

Daniel Krügler

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