Q42703: File with Double Underscore Hangs the QB.EXE Environment

Article: Q42703
Product(s): See article
Version(s): 4.00 4.00b 4.50
Operating System(s): MS-DOS
Keyword(s): ENDUSER | buglist4.00 buglist4.00b buglist4.50 B_BasicCom | mspl13_basic
Last Modified: 26-FEB-1990

When a file consisting of only two underscore characters (__) is
loaded into the QuickBASIC editor, the "Loading and Parsing" message
is displayed at the bottom and the machine hangs.

Microsoft has confirmed this to be a problem in QuickBASIC Versions
4.00, 4.00b, and 4.50, and in the QB.EXE program shipped with
Microsoft BASIC Compiler Versions 6.00 and 6.00b. This problem was
corrected in Microsoft BASIC Professional Development System (PDS)
Version 7.00 (fixlist7.00).