Fortran: Fix intrinsic null() handling [PR99651]

gcc/fortran/ChangeLog:

	PR fortran/99651
	* intrinsic.c (gfc_intrinsic_func_interface): Set
	attr.proc = PROC_INTRINSIC if FL_PROCEDURE.

gcc/testsuite/ChangeLog:

	PR fortran/99651
	* gfortran.dg/null_11.f90: New test.

 gcc/fortran/intrinsic.c               |  5 +++++
 gcc/testsuite/gfortran.dg/null_11.f90 | 16 ++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/gcc/fortran/intrinsic.c b/gcc/fortran/intrinsic.c
index e68eff8bdbb..17fd92eb462 100644
--- a/gcc/fortran/intrinsic.c
+++ b/gcc/fortran/intrinsic.c
@@ -5071,6 +5071,11 @@ got_specific:
       sym->attr.intrinsic = 1;
       sym->attr.flavor = FL_PROCEDURE;
     }
+  if (sym->attr.flavor == FL_PROCEDURE)
+    {
+      sym->attr.function = 1;
+      sym->attr.proc = PROC_INTRINSIC;
+    }
 
   if (!sym->module)
     gfc_intrinsic_symbol (sym);
diff --git a/gcc/testsuite/gfortran.dg/null_11.f90 b/gcc/testsuite/gfortran.dg/null_11.f90
new file mode 100644
index 00000000000..040cc260b5d
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/null_11.f90
@@ -0,0 +1,16 @@
+! { dg-do compile }
+!
+! PR fortran/99651
+!
+module m
+    type :: CHAR_STAR
+      character(len=1),dimension(:),pointer :: ptr
+    end type
+    type(CHAR_STAR), parameter ::CHAR_STAR_NULL = CHAR_STAR(NULL())
+end module m
+
+use m
+type typeNode
+    type(typeNode),   pointer       :: Next => null()
+end type typeNode
+end