[Issue 13724] std.datetime.timeIt

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13724

--- Comment #6 from bearophile_h...@eml.cc ---
What about supporting both kinds of use (if you don't give an argument it
returns the timing):

37.fibonacci.timeIt.writeln;
Duration t;
37.fibonacci.timeIt(t).foo();

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