[Issue 15882] writeln on a bad dstring triggering assert(0) in std.utf.toUTF8

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15882

--- Comment #3 from erikas.aubade at gmail.com ---
(And just to clarify, my personal preference would be to have it print the
Unicode replacement char (U+FFFD), similar to other functions in std.utf)

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