! RUN: %python %S/test_errors.py %s %flang_fc1

! When a module subprogram has the MODULE prefix the following must match
! with the corresponding separate module procedure interface body:
! - C1549: characteristics and dummy argument names
! - C1550: binding label
! - C1551: NON_RECURSIVE prefix

module m1
  interface
    module subroutine s4(x)
      real, intent(in) :: x
    end
    module subroutine s5(x, y)
      real, pointer :: x
      real, value :: y
    end
    module subroutine s6(x, y)
      real :: x
      real :: y
    end
    module subroutine s7(x, y, z)
      real :: x(8)
      real :: y(8)
      real :: z(8)
    end
    module subroutine s8(x, y, z)
      real :: x(8)
      real :: y(*)
      real :: z(*)
    end
    module subroutine s9(x, y, z, w)
      character(len=4) :: x
      character(len=4) :: y
      character(len=*) :: z
      character(len=*) :: w
    end
    module subroutine s10(x, y, z, w)
      real x(0:), y(:), z(0:*), w(*)
    end
  end interface
end

submodule(m1) sm1
contains
  module subroutine s4(x)
    !ERROR: The intent of dummy argument 'x' does not match the intent of the corresponding argument in the interface body
    real, intent(out) :: x
  end
  module subroutine s5(x, y)
    !ERROR: Dummy argument 'x' has the OPTIONAL attribute; the corresponding argument in the interface body does not
    real, pointer, optional :: x
    !ERROR: Dummy argument 'y' does not have the VALUE attribute; the corresponding argument in the interface body does
    real :: y
  end
  module subroutine s6(x, y)
    !ERROR: Dummy argument 'x' has type INTEGER(4); the corresponding argument in the interface body has distinct type REAL(4)
    integer :: x
    !ERROR: Dummy argument 'y' has type REAL(8); the corresponding argument in the interface body has distinct type REAL(4)
    real(8) :: y
  end
  module subroutine s7(x, y, z)
    integer, parameter :: n = 8
    real :: x(n)
    real :: y(2:n+1)
    !ERROR: The shape of dummy argument 'z' does not match the shape of the corresponding argument in the interface body
    real :: z(n+1)
  end
  module subroutine s8(x, y, z)
    !ERROR: The shape of dummy argument 'x' does not match the shape of the corresponding argument in the interface body
    real :: x(*)
    real :: y(*)
    !ERROR: The shape of dummy argument 'z' does not match the shape of the corresponding argument in the interface body
    real :: z(8)
  end
  module subroutine s9(x, y, z, w)
    character(len=4) :: x
    !ERROR: Dummy argument 'y' has type CHARACTER(KIND=1,LEN=5_8); the corresponding argument in the interface body has distinct type CHARACTER(KIND=1,LEN=4_8)
    character(len=5) :: y
    character(len=*) :: z
    !ERROR: Dummy argument 'w' has type CHARACTER(KIND=1,LEN=4_8); the corresponding argument in the interface body has distinct type CHARACTER(KIND=1,LEN=*)
    character(len=4) :: w
  end
  module subroutine s10(x, y, z, w)
    real x(:), y(0:), z(*), w(0:*) ! all ok, lower bounds don't matter
  end
end

module m2
  interface
    module subroutine s1(x, y)
      real, intent(in) :: x
      real, intent(out) :: y
    end
    module subroutine s2(x, y)
      real, intent(in) :: x
      real, intent(out) :: y
    end
    module subroutine s3(x, y)
      real(4) :: x
      procedure(real) :: y
    end
    module subroutine s4()
    end
    non_recursive module subroutine s5()
    end
  end interface
end

submodule(m2) sm2
contains
  !ERROR: Module subprogram 's1' has 3 args but the corresponding interface body has 2
  module subroutine s1(x, y, z)
    real, intent(in) :: x
    real, intent(out) :: y
    real :: z
  end
  module subroutine s2(x, z)
    real, intent(in) :: x
  !ERROR: Dummy argument name 'z' does not match corresponding name 'y' in interface body
    real, intent(out) :: z
  end
  module subroutine s3(x, y)
    !ERROR: Dummy argument 'x' is a procedure; the corresponding argument in the interface body is not
    procedure(real) :: x
    !ERROR: Dummy argument 'y' is a data object; the corresponding argument in the interface body is not
    real :: y
  end
  !ERROR: Module subprogram 's4' has NON_RECURSIVE prefix but the corresponding interface body does not
  non_recursive module subroutine s4()
  end
  !ERROR: Module subprogram 's5' does not have NON_RECURSIVE prefix but the corresponding interface body does
  module subroutine s5()
  end
end

module m2b
  interface
    module subroutine s1()
    end
    module subroutine s2() bind(c, name="s2")
    end
    module subroutine s3() bind(c, name="s3")
    end
    module subroutine s4() bind(c, name=" s4")
    end
    module subroutine s5() bind(c)
    end
    module subroutine s6() bind(c)
    end
  end interface
end

submodule(m2b) sm2b
  character(*), parameter :: suffix = "_xxx"
contains
  !ERROR: Module subprogram 's1' has a binding label but the corresponding interface body does not
  !ERROR: Module subprogram 's1' and its corresponding interface body are not both BIND(C)
  module subroutine s1() bind(c, name="s1")
  end
  !ERROR: Module subprogram 's2' does not have a binding label but the corresponding interface body does
  !ERROR: Module subprogram 's2' and its corresponding interface body are not both BIND(C)
  module subroutine s2()
  end
  !ERROR: Module subprogram 's3' has binding label 's3_xxx' but the corresponding interface body has 's3'
  module subroutine s3() bind(c, name="s3" // suffix)
  end
  module subroutine s4() bind(c, name="s4  ")
  end
  module subroutine s5() bind(c, name=" s5")
  end
  !ERROR: Module subprogram 's6' has binding label 'not_s6' but the corresponding interface body has 's6'
  module subroutine s6() bind(c, name="not_s6")
  end
end


module m3
  interface
    module subroutine s1(x, y, z)
      procedure(real), pointer, intent(in) :: x
      procedure(real), pointer, intent(out) :: y
      procedure(real), pointer, intent(out) :: z
    end
    module subroutine s2(x, y)
      procedure(real), pointer :: x
      procedure(real) :: y
    end
  end interface
end

submodule(m3) sm3
contains
  module subroutine s1(x, y, z)
    procedure(real), pointer, intent(in) :: x
    !ERROR: The intent of dummy argument 'y' does not match the intent of the corresponding argument in the interface body
    procedure(real), pointer, intent(inout) :: y
    !ERROR: The intent of dummy argument 'z' does not match the intent of the corresponding argument in the interface body
    procedure(real), pointer :: z
  end
  module subroutine s2(x, y)
    !ERROR: Dummy argument 'x' has the OPTIONAL attribute; the corresponding argument in the interface body does not
    !ERROR: Dummy argument 'x' does not have the POINTER attribute; the corresponding argument in the interface body does
    procedure(real), optional :: x
    !ERROR: Dummy argument 'y' has the POINTER attribute; the corresponding argument in the interface body does not
    procedure(real), pointer :: y
  end
end

module m4
  interface
    subroutine s_real(x)
      real :: x
    end
    subroutine s_real2(x)
      real :: x
    end
    subroutine s_integer(x)
      integer :: x
    end
    module subroutine s1(x)
      procedure(s_real) :: x
    end
    module subroutine s2(x)
      procedure(s_real) :: x
    end
  end interface
end

submodule(m4) sm4
contains
  module subroutine s1(x)
    !OK
    procedure(s_real2) :: x
  end
  module subroutine s2(x)
    !ERROR: Dummy procedure 'x' does not match the corresponding argument in the interface body
    procedure(s_integer) :: x
  end
end

module m5
  interface
    module function f1()
      real :: f1
    end
    module subroutine s2()
    end
  end interface
end

submodule(m5) sm5
contains
  !ERROR: Module subroutine 'f1' was declared as a function in the corresponding interface body
  module subroutine f1()
  end
  !ERROR: Module function 's2' was declared as a subroutine in the corresponding interface body
  module function s2()
  end
end

module m6
  interface
    module function f1()
      real :: f1
    end
    module function f2()
      real :: f2
    end
    module function f3()
      real :: f3
    end
  end interface
end

submodule(m6) ms6
contains
  !OK
  real module function f1()
  end
  !ERROR: Result of function 'f2' is not compatible with the result of the corresponding interface body: function results have distinct types: INTEGER(4) vs REAL(4)
  integer module function f2()
  end
  !ERROR: Result of function 'f3' is not compatible with the result of the corresponding interface body: function results have incompatible attributes
  module function f3()
    real :: f3
    pointer :: f3
  end
end

module m7
  interface
    module subroutine s1(x, *)
      real :: x
    end
  end interface
end

submodule(m7) sm7
contains
  !ERROR: Dummy argument 1 of 's1' is an alternate return indicator but the corresponding argument in the interface body is not
  !ERROR: Dummy argument 2 of 's1' is not an alternate return indicator but the corresponding argument in the interface body is
  module subroutine s1(*, x)
    real :: x
  end
end

module m8
  interface
    pure elemental module subroutine s1
    end subroutine
  end interface
end module

submodule(m8) sm8
 contains
  !Ensure no spurious error about mismatching attributes
  module procedure s1
  end procedure
end submodule

module m9
  interface
    module subroutine sub1(s)
      character(len=0) s
    end subroutine
    module subroutine sub2(s)
      character(len=0) s
    end subroutine
  end interface
end module

submodule(m9) sm1
 contains
  module subroutine sub1(s)
    character(len=-1) s ! ok
  end subroutine
  module subroutine sub2(s)
    !ERROR: Dummy argument 's' has type CHARACTER(KIND=1,LEN=1_8); the corresponding argument in the interface body has distinct type CHARACTER(KIND=1,LEN=0_8)
    character(len=1) s
  end subroutine
end submodule

module m10
  interface
    module character(2) function f()
    end function
  end interface
end module
submodule(m10) sm10
 contains
  !ERROR: Result of function 'f' is not compatible with the result of the corresponding interface body: function results have distinct types: CHARACTER(KIND=1,LEN=3_8) vs CHARACTER(KIND=1,LEN=2_8)
  module character(3) function f()
  end function
end submodule