Q58498: No Error in QB Using Duplicate Parameter Name in DECLARE

Article: Q58498
Product(s): See article
Version(s): 4.00 4.00b 4.50
Operating System(s): MS-DOS
Keyword(s): ENDUSER | SR# S900126-79 B_BasicCom buglist4.00 buglist4.00b buglist4. | mspl13_basic
Last Modified: 20-SEP-1990

The QuickBASIC environment fails to give an error message for a
DECLARE statement that has several parameters with the same name. But
when compiled with BC.EXE, the same statement correctly causes the
following severe errors:

   Formal parameters not unique
   Formal parameter specification illegal

Microsoft has confirmed this to be a problem in the QB.EXE environment
of Microsoft QuickBASIC versions 4.00, 4.00b, and 4.50; in the QB.EXE
environment of Microsoft BASIC Compiler versions 6.00 and 6.00b
(buglist6.00, buglist6.00b); and in the QBX.EXE (QuickBASIC Extended)
environment of Microsoft BASIC Professional Development System (PDS)
versions 7.00 and 7.10 for MS-DOS (buglist7.00, buglist7.10). We are
researching this problem and will post new information here as it
becomes available.

The following code example fails to produce an error inside the
QuickBASIC QB.EXE or QBX.EXE environment:

   DECLARE SUB test (a%, a%)   'This line should cause error
   CALL test(1, 2)
   END

   SUB test (a%, b%)
   PRINT a%, b%
   END SUB

When the above program is compiled with BC.EXE, the compiler correctly
flags the DECLARE line as follows:

   DECLARE SUB test (a%, a%)   'This line should cause error
                         ^ Formal parameters not unique
                         ^ Formal parameter specification illegal