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diff --git a/gcc/testsuite/gfortran.dg/c_kind_int128_test1.f03 b/gcc/testsuite/gfortran.dg/c_kind_int128_test1.f03
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+! { dg-do compile }
+! { dg-options "-std=f2003" }
+! { dg-require-effective-target fortran_integer_16 }
+!
+
+subroutine c_kind_int128_1
+ use, intrinsic :: iso_c_binding
+ implicit none
+
+ integer(c_int128_t) :: a ! { dg-error "has no IMPLICIT type" }
+ integer(c_int_least128_t) :: b ! { dg-error "has no IMPLICIT type" }
+ integer(c_int_fast128_t) :: c ! { dg-error "has no IMPLICIT type" }
+
+end subroutine c_kind_int128_1
+
+
+subroutine c_kind_int128_2
+ use, intrinsic :: iso_c_binding
+
+ integer(c_int128_t) :: a ! { dg-error "has not been declared or is a variable" }
+ integer(c_int_least128_t) :: b ! { dg-error "has not been declared or is a variable" }
+ integer(c_int_fast128_t) :: c ! { dg-error "has not been declared or is a variable" }
+
+end subroutine c_kind_int128_2