Bug 11128 – std.algorithm.reduce one-argument version cannot always be chained using UFCS

Example: arr1.reduce!((s, x) => s + (x / 3)); Because the natural seed value is arr1.front, depending on the type, this will return an incorrect result, so you therefore need to provide a seed, using the one-argument version of std.algorithm.reduce, this cannot be done. You are therefore forced to use the standard syntax: reduce!((s, x) => s + (x / 3))(0, arr1); Or: 0.reduce!((s, x) => s + (x / 3))(arr1); This seems counter-intuitive, compared to: arr1.reduce!((s, x) => s + (x / 3))(0); This change wouldn't play pretty.

Yep, it's irritating, and a known issue. Closing as dupe. *** This issue has been marked as a duplicate of issue 8755 ***