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diff --git a/gcc/testsuite/gfortran.dg/interface_15.f90 b/gcc/testsuite/gfortran.dg/interface_15.f90
new file mode 100644
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+++ b/gcc/testsuite/gfortran.dg/interface_15.f90
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+! { dg-do compile }
+! { dg-options "-c -std=f95" }
+! Testcase from PR fortran/25094
+! Contributed by Joost VandeVondele <jv244@cam.ac.uk>
+
+MODULE M1
+  TYPE T1
+    INTEGER :: I
+  END TYPE T1
+  INTERFACE I
+    MODULE PROCEDURE F1
+  END INTERFACE
+  PRIVATE ! :: T1,F1
+  PUBLIC  :: I
+CONTAINS
+  INTEGER FUNCTION F1(D)  ! { dg-error "PUBLIC interface" }
+    TYPE(T1) :: D
+    F1 = D%I
+  END FUNCTION
+END MODULE
+
+! { dg-final { cleanup-modules "M1" } }