Bug 19287 – each only accepts lambdas that take a single argument

See https://forum.dlang.org/post/[email protected] for the motivation. struct that contain destructors cannot be closed over (I'm not sure why but thats a different problem) and so CantCloseMe o; // some struct with a door somerange.each!(e => foo(o,e)); //Error: variable `o` has scoped destruction, cannot build closure fails. But it can't be worked around with somerange.each!((e,f) => foo(o,f))(o); Fails with Error: template somerange.each!((e,f) => foo(o,f)).each cannot deduce function from argument types !()(SomeRange, CantCloseMe), candidates are: ... because all of the each functions take only a range or iterable.

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