Q50552: QB.EXE Hangs If BACKSPACE after IF GOTO Syntax (with No THEN)

Article: Q50552
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: 16-DEC-1989

When editing a legal IF GOTO syntax that has no THEN word, if you
press the BACKSPACE key in the column beneath the "I" in the "IF"
statement, the computer hangs.

This problem occurs in the QB.EXE editor in Microsoft QuickBASIC
Versions 4.00, 4.00b, and 4.50 for MS-DOS and in QB.EXE in Microsoft
BASIC Compiler Versions 6.00 and 6.00b for MS-DOS (buglist6.00,
buglist6.00b). This problem was corrected in QBX.EXE in Microsoft
BASIC PDS (Professional Development System) Version 7.00
(fixlist7.00).

The hanging problem does not occur when you use the THEN word in the
IF <condition> THEN GOTO syntax.

The following is a code example:

   IF x=0 GOTO label

While the cursor is in the column beneath the "I" in the "IF"
statement (the first column), press the BACKSPACE key to hang the
machine.

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