flang/test/Semantics/modfile41.f90

   1 ! RUN: %python %S/test_errors.py %s %flang_fc1
   2 ! Test USE statements that use same module multiple times mixed with rename
   3 ! clauses and ONLY clauses
   4 module m1
   5   integer :: a = 1
   6   integer :: b = 2
   7 end module m1
   8 module m2
   9   integer :: a = 3
  10 end module m2
  11 module m3
  12   integer :: a = 1
  13   type t1
  14     real t1_value
  15   end type
  16   type t2
  17     complex t2_value
  18   end type
  19 end module m3
  20 module m4
  21   use m1
  22 end module m4
  23 module m5
  24   use m1
  25   use m1, z=>a
  26 end module m5
  27 module m6
  28   use m1, only : a
  29 end module m6
  30 program testUse1
  31   use m1
  32   use m1,z=>a ! This prevents the use association of m1's "a" as local "a"
  33   use m2 ! m2's version of "a" gets use associated
  34   !ERROR: 'a' is use-associated from module 'm2' and cannot be re-declared
  35   integer :: a = 2
  36 end
  37 subroutine testUse2
  38   use m1,only : a ! This forces the use association of m1's "a" as local "a"
  39   use m1,z=>a ! This rename doesn't affect the previous forced USE association
  40   !ERROR: 'a' is use-associated from module 'm1' and cannot be re-declared
  41   integer :: a = 2
  42 end
  43 subroutine testUse3
  44   use m1 ! By itself, this would use associate m1's "a" with a local "a"
  45   use m1,z=>a ! This rename of m1'a "a" removes the previous use association
  46   integer :: a = 2
  47 end
  48 subroutine testUse4
  49   use m1,only : a ! Use associate m1's "a" with local "a"
  50   use m1,z=>a ! Also use associate m1's "a" with local "z", also pulls in "b"
  51   !ERROR: 'b' is use-associated from module 'm1' and cannot be re-declared
  52   integer :: b = 2
  53 end
  54 subroutine testUse5
  55   use m1,z=>a ! The rename prevents creation of a local "a"
  56   use m1 ! Does not create a local "a" because of the previous rename
  57   integer :: a = 2
  58 end
  59 subroutine testUse6
  60   use m1, z => a ! Hides m1's "a"
  61   use m1, y => b ! Hides m1's "b"
  62   integer :: a = 4 ! OK
  63   integer :: b = 5 ! OK
  64 end
  65 subroutine testUse7
  66   use m3,t1=>t2,t2=>t1 ! Looks weird but all is good
  67   type(t1) x
  68   type(t2) y
  69   x%t2_value = a
  70   y%t1_value = z
  71 end
  72 subroutine testUse8
  73   use m4 ! This USE associates all of m1
  74   !ERROR: 'a' is use-associated from module 'm4' and cannot be re-declared
  75   integer :: a = 2
  76 end
  77 subroutine testUse9
  78   use m5
  79   integer :: a = 2
  80 end
  81 subroutine testUse10
  82   use m4
  83   use m4, z=>a ! This rename erases the USE assocated "a" from m1
  84   integer :: a = 2
  85 end
  86 subroutine testUse11
  87   use m6
  88   use m6, z=>a ! This rename erases the USE assocated "a" from m1
  89   integer :: a = 2
  90 end
  91 subroutine testUse12
  92   use m4 ! This USE associates "a" from m1
  93   use m1, z=>a ! This renames the "a" from m1, but not the one through m4
  94   !ERROR: 'a' is use-associated from module 'm4' and cannot be re-declared
  95   integer :: a = 2
  96 end