On Sunday, 11 June 2017 at 00:28:58 UTC, Andrei Alexandrescu
wrote:
enum bool isInputRange(R) =
is(typeof((ref R r) => r)) && "must be copyable"
Regardless of the implementation method, this will require the
previously proposed Phobos refactoring. Independent special
definitions have to be reduced to general ones and use "static
if" to select the algorithm. Otherwise, each failed independent
definition will give an additional error message, and the
compiler does not have the ability to determine which one is
relevant.
