--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gfortran.dg/achar_6.F90	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,70 @@
+! { dg-do run }
+! { dg-options "-fbackslash" }
+
+#define TEST(x,y,z) \
+  call test (x, y, z, iachar(x), iachar(y), ichar(x), ichar(y))
+
+  TEST("a", 4_"a", 97)
+  TEST("\0", 4_"\0", 0)
+  TEST("\b", 4_"\b", 8)
+  TEST("\x80", 4_"\x80", int(z'80'))
+  TEST("\xFF", 4_"\xFF", int(z'FF'))
+
+#define TEST2(y,z) \
+  call test_bis (y, z, iachar(y), ichar(y))
+
+  TEST2(4_"\u0100", int(z'0100'))
+  TEST2(4_"\ufe00", int(z'fe00'))
+  TEST2(4_"\u106a", int(z'106a'))
+  TEST2(4_"\uff00", int(z'ff00'))
+  TEST2(4_"\uffff", int(z'ffff'))
+
+contains
+
+subroutine test (s1, s4, i, i1, i2, i3, i4)
+  character(kind=1,len=1) :: s1
+  character(kind=4,len=1) :: s4
+  integer :: i, i1, i2, i3, i4
+
+  if (i /= i1) call abort
+  if (i /= i2) call abort
+  if (i /= i3) call abort
+  if (i /= i4) call abort
+
+  if (iachar (s1) /= i) call abort
+  if (iachar (s4) /= i) call abort
+  
+  if (ichar (s1) /= i) call abort
+  if (ichar (s4) /= i) call abort
+  
+  if (achar(i, kind=1) /= s1) call abort
+  if (achar(i, kind=4) /= s4) call abort
+
+  if (char(i, kind=1) /= s1) call abort
+  if (char(i, kind=4) /= s4) call abort
+
+  if (iachar(achar(i, kind=1)) /= i) call abort
+  if (iachar(achar(i, kind=4)) /= i) call abort
+
+  if (ichar(char(i, kind=1)) /= i) call abort
+  if (ichar(char(i, kind=4)) /= i) call abort
+
+end subroutine test
+
+subroutine test_bis (s4, i, i2, i4)
+  character(kind=4,len=1) :: s4
+  integer :: i, i2, i4
+
+  if (i /= i2) call abort
+  if (i /= i4) call abort
+
+  if (iachar (s4) /= i) call abort
+  if (ichar (s4) /= i) call abort
+  if (achar(i, kind=4) /= s4) call abort
+  if (char(i, kind=4) /= s4) call abort
+  if (iachar(achar(i, kind=4)) /= i) call abort
+  if (ichar(char(i, kind=4)) /= i) call abort
+
+end subroutine test_bis
+
+end