Bug 21815 – std.format: invalid UTF-character throws with width but not without

char[1] c; writefln!"%s"(c[]); writefln!"%5s"(c[]); The first writefln prints 0xff-character, while the second one throws an UFTException: "Attempted to decode past the end of a string (at index 1)". IMHO, the second one should not throw, but just write some (four?) spaces and a 0xff-character.

Reading the unicode standard, I think, I erred here on what should happen. Actually, the invalid 0xff character should be replaced by a 0xFFFD-replacement character in both versions (or both versions should throw, but that is not recommended any more, because it might permit a denial of service attack).

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