Our non-lazy adaptors #939
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Fixes #791
Itertools::{kmerge, kmerge_by, tuple_combinations}are neither lazy nor eager. But they must be used since not doing so does almost nothing (and it would be suspicious code to me).I therefore update the message of the
must_useattributes and the laziness tests.Unless we are willing to roughly wrap those in a
LazyInittype (see #791 (comment)) that would probably slow down iteration ("Is it initialized?" each timenextis called), I don't see an alternative.