@q: Turn off module and line info locally

The command-line option -# (see -#) turns off comments about module and line numbers globally, for the entire code. However, in some cases one wants to turn that off in just a small block of code. One important example arises in FORTRAN. Consider

     @
     @a
           x = @<Some action@>
     
     @
     @<Some action@>=
     y + z
     

This example will tangle to something like

           x =
     C* 1: *
     *line 20 "test.web"
           y + z
     C* :1 *
     *line 5 "test.web"
     

Unfortunately, the information comments have created invalid code that will not compile.

The @q command solves this problem by turning off or on the information comments locally. @q0 turns them off; @q1 turns them on. Thus, if one rewrites the above example as

     @
     @a
     @q0
           x = @<Some action@>
     @q1
     

it will tangle to

           x = y + z
     

as one desires.

For another use of the @q command, see ATo.