std.utf.decode behaves unexpectedly - Bug?

[HeiHon via Digitalmars-d-learn]

Sorry, I mixed up the line numbers from dmd 2.068.2 and dmd 
2.069.0.
The correct line numbers for dmd 2.069.0 are:

Attempted to decode past the end of a string (at index 1) 
file=D:\dmd2\windows\bin\..\..\src\phobos\std\utf.d line=1281

and

core.exception.RangeError at std\utf.d(1278): Range violation