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! { dg-do compile }
! { dg-options "-fwhole-file -Wno-unused-dummy-argument" }
!
! PR fortran/34260
!
PROGRAM MAIN
REAL A
CALL SUB(A) ! { dg-error "Explicit interface required" }
END PROGRAM
SUBROUTINE SUB(A,I)
REAL :: A
INTEGER, OPTIONAL :: I
END SUBROUTINE
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