[NTG-context] luatex run: edit (E) on syntax error

Hello, (Learning to use mkIV under Debian) Under luatex (texexec --lua) it seems that choosing to edit (E) the source file upon detection of a syntax error echos "You want to edit file ./filename.tex at line 68" and then continues without launching the editor. Has anyone else seen this? (of course, NOBODY other than myself makes syntax errors!) Thanks, Alan