[J3] an amusing mistake

[Robert Corbett]

In the past few days, I had reasons to read
the Fortran 2018 standard more closely than
I usually read it.  As often happens when I
read the standard closely, I saw problems
that I overlooked before.  Yesterday, I saw
a problem I found amusing.  (Yes, I am
easily amused.)

Consider the two programs

-------------------------------------------
      PROGRAM ONE
        CHARACTER*1, C(SUM([1]))
      END
-------------------------------------------
      PROGRAM TWO
        CHARACTER*1, C(SUM([INTEGER:: 1])
      END
-------------------------------------------

The first program is standard conforming.
The second program is not a conforming
program under a strict reading of the
standard.  Both programs should be
standard conforming.

I suspect there are compilers that 
accept both programs and other compilers
that reject both programs.  I doubt there
are any compilers that accept the first
program and reject the second.
Bob Corbett

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