Error: Outside Unicode code space

[Tony via Digitalmars-d-learn]

I copied some text from a web page into a comment and I get the 
error
"Error: Outside Unicode code space".

This appears to be an incorrect error message. It is upset about 
double quotes that lean forward or backwards, and apostrophes 
that lean backwards. And dashes that aren't the keyboard dash 
character.

The editor I am using (Code::Blocks) displays the characters just 
fine. So it seems that the error message should be "Error: 
Outside the ASCII code space".