[Fortran 90] concatop should be //

[suehshtri]

I think that CONCATOP should be '//' . R711 .

CONCATOP: '//';

test input:

`program strinconcat
character*30 A
A='Quick'//' '//'brown'//' '//'fox'

write(,)A
end program strinconcat
`

@kaby76 , thank you!