fortran/
	PR fortran/54107
	* trans-types.c (gfc_get_function_type): Change a NULL backend_decl
	to error_mark_node on entry.  Detect recursive types.  Build a variadic
	procedure type if the type is recursive.  Restore the initial
	backend_decl.

testsuite/
	PR fortran/54107
	* gfortran.dg/recursive_interface_2.f90: New test.

From-SVN: r195890