Re: column numbers for non-ASCII characters in error messages

[Bruno Haible]

> >         * Grapheme clusters (user-visible characters) from
> >           beginning of line, as specified in Unicode Standard
> >           Annex #29 "Unicode Text Segmentation".
> 
> Grapheme clusters are a notion used for rendering of text. In many
> situations this definition yields the same value as the previous one

Oops, John Cowan corrected me: The difference matters also for double-width
characters such as the Chinese or Japanese ideographs.

Bruno