[PATCH] PR fortran/56520 -- Special case unary minus/plus

[Jerry DeLisle]

On 07/01/2015 10:53 AM, Steve Kargl wrote:
> The attached patch special cases unary minus/plus when
> gfotran tries to match a function keyword in a mangled
> statement.  The testcase contains examples, but for
> context consider 'c = exp(-a) )' where the final ')'
> is erronous.  gfortran is trying to match a keyword
> such as 'c = exp(x=-a)' so it expects the character
> after the '(' to be in [a-z] or '_'.  Prior to this
> patch, gfortran would do
> 
> % gfc -c sd.f90
> sd.f90:8:13:
> 
>      c = exp(-a) )    ! dg-error { "Unclassifiable statement" }
>              1
> Error: Invalid character in name at (1)
> 
> with the patch gfortran will instead issue
> 
> % gfc -c sd.f90
> sd.f90:8:4:
> 
>      c = exp(-a) )    ! dg-error { "Unclassifiable statement" }
>     1
> Error: Unclassifiable statement at (1)
> 
> It can be debated that the new error message isn't much better
> than old.  I don't care to enter into such a debate, so will 
> ignore comments complaining the new meesage isn't much of an
> improvement over the old.
> 
> Regression tested on trunk.  Ok to commit?
> 

Yes OK. I agree we should not quibble over the error message as long as it is
not misleading.

Thanks,

Jerry