| ! This demonstrates an inconsistency in the handling of modules with renaming. |
| ! J. Overbey 8 Apr 2010 |
| |
| module m1 |
| implicit none |
| integer :: m |
| integer :: n |
| end module |
| |
| module m2 |
| implicit none |
| integer :: o |
| integer :: p |
| end module |
| |
| module helper; implicit none; contains |
| subroutine init |
| use m1 |
| use m2 |
| m = 1 |
| n = 2 |
| o = 3 |
| p = 4 |
| end subroutine |
| end module |
| |
| program test |
| use helper |
| use m1, n => m ! m is inaccessible |
| ! Does the local n shadow the module entity n? |
| use m2, oo => p |
| implicit none |
| integer :: p |
| p = 5 |
| call init |
| |
| ! There is ambiguity in the Fortran 95 standard as to how the following |
| ! statement should be handled. According to Section 11.3.2: |
| ! "Two or more accessible entities, other than |
| ! generic interfaces, may have the same name only if |
| ! the name is not used to refer to an entity in the |
| ! scoping unit. ... the local name of any entity |
| ! given accessibility by a USE statement shall differ |
| ! from the local names of all other entities accessible |
| ! to the scoping unit through USE statements and |
| ! otherwise." |
| ! GNU Fortran 4.4.2: Compilation fails: n is an ambiguous reference |
| ! IBM XL Fortran 12.1: Outputs 2 3 5 |
| ! Intel Fortran 10.1: Outputs 2 3 5 |
| ! PGI Fortran 10.0: Outputs 1 3 5 |
| print *, n, o, p |
| |
| end program |
