[Bug fortran/54679] Erroneous "Expected P edit descriptor" in conjunction with L descriptor

[kargl at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54679

kargl at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P5
                 CC|                            |kargl at gcc dot gnu.org
           Severity|normal                      |trivial

--- Comment #2 from kargl at gcc dot gnu.org 2012-09-23 16:24:01 UTC ---
(In reply to comment #1)
> Please reduce the severity to trivial, and change it to "Confusing
> diagnostic"!  It's my error, at root, but gfortran could do better.
> 
> I had forgotten the relevant constraint (C1006 in Fortran 2003).
> However, the syntax rule R1005 on the same page specifies that a
> width is mandatory for the L descriptor, so the actual error is
> that a width of zero is erroneous.

I agree that the error message is confusing. First, the F2008 
constraint is 

C1006 (R1008) w shall be zero or positive for the I, B, O, Z, F,
      and G edit descriptors. w shall be positive for all other
      edit descriptors.

Second, we have 

10.8.5  P editing

   The k P edit descriptor temporarily changes (9.5.2) the scale
   factor for the connection to k . The scale factor affects the
   editing done by the F, E, EN, ES, D, and G edit descriptors
   for numeric quantities.

So P editing does not even apply to the L descriptor.