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diff --git a/gcc/testsuite/gfortran.dg/function_charlen_1.f90 b/gcc/testsuite/gfortran.dg/function_charlen_1.f90
new file mode 100644
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--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/function_charlen_1.f90
@@ -0,0 +1,23 @@
+! { dg-do compile }
+! Tests the fix for PR34429 in which function charlens that were
+! USE associated would cause an error.
+!
+! Contributed by Tobias Burnus <burnus@gcc.gnu.org>
+!
+module m
+  integer, parameter :: strlen = 5
+end module m
+
+character(strlen) function test()
+  use m
+  test = 'A'
+end function test
+
+  interface
+    character(strlen) function test()
+      use m
+    end function test
+  end interface
+  print *, test()
+end
+! { dg-final { cleanup-modules "m" } }