1 files changed, 68 insertions, 0 deletions
diff --git a/gcc/testsuite/gfortran.dg/redefined_intrinsic_assignment_2.f90 b/gcc/testsuite/gfortran.dg/redefined_intrinsic_assignment_2.f90
new file mode 100644
index 000000000..ba7090209
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/redefined_intrinsic_assignment_2.f90
@@ -0,0 +1,68 @@
+! { dg-do compile }
+!
+! PR fortran/47448
+!
+! ASSIGNMENT(=) checks. Defined assignment is allowed if and only if
+! it does not override an intrinsic assignment.
+!
+
+module test1
+  interface assignment(=)
+     module procedure valid, valid2
+  end interface
+contains
+  ! Valid: scalar = array
+  subroutine valid (lhs,rhs)
+    integer, intent(out) ::  lhs
+    integer, intent(in) :: rhs(:)
+    lhs = rhs(1) 
+  end subroutine valid
+
+  ! Valid: array of different ranks
+  subroutine valid2 (lhs,rhs)
+    integer, intent(out) ::  lhs(:)
+    integer, intent(in) :: rhs(:,:)
+    lhs(:) = rhs(:,1) 
+  end subroutine valid2
+end module test1
+
+module test2
+  interface assignment(=)
+     module procedure invalid
+  end interface
+contains
+  ! Invalid: scalar = scalar
+  subroutine invalid (lhs,rhs) ! { dg-error "must not redefine an INTRINSIC type assignment" }
+    integer, intent(out) ::  lhs
+    integer, intent(in) :: rhs
+    lhs = rhs
+  end subroutine invalid
+end module test2
+
+module test3
+  interface assignment(=)
+     module procedure invalid2
+  end interface
+contains
+  ! Invalid: array = scalar
+  subroutine invalid2 (lhs,rhs) ! { dg-error "must not redefine an INTRINSIC type assignment" }
+    integer, intent(out) ::  lhs(:)
+    integer, intent(in) :: rhs
+    lhs(:) = rhs
+  end subroutine invalid2
+end module test3
+
+module test4
+  interface assignment(=)
+     module procedure invalid3
+  end interface
+contains
+  ! Invalid: array = array for same rank
+  subroutine invalid3 (lhs,rhs) ! { dg-error "must not redefine an INTRINSIC type assignment" }
+    integer, intent(out) ::  lhs(:)
+    integer, intent(in) :: rhs(:)
+    lhs(:) = rhs(:)
+  end subroutine invalid3
+end module test4
+
+! { dg-final { cleanup-modules "test1" } }