[Issue 12768] @nogc algorithm.splitter

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12768

--- Comment #3 from bearophile_hugs at eml.cc ---
In DMD 2.066beta5 std.utf.decode and std.algorithm: splitter are still @nogc,
while std.utf.isValidDchar and std.uni.isWhite are now @nogc. I think the main
problems now are caused by the exceptions and errors.

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