The S switch turns off the display of ++INCLUDE file names. This conflicts with the BASIC Plus compiler which uses /S for .SBR instead of .XBR subroutine extensions. Under A-Shell, subroutine name extensions are irrelevant, since they are linked into the executable. Note that since eliminating the ++INCLUDE messages makes it difficult to determine which include file an error occurs in, the error message format is modified by this switch to include the file name and line number.