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+! { dg-do compile }
+!
+! NULL(...) pointer is not allowed as operand
+! PR fortran/20888
+!
+! Contributed by Joost VandeVondele
+!
+PROGRAM main
+ IMPLICIT NONE
+ REAL, POINTER :: TEST
+ NULLIFY(TEST)
+ TEST => -NULL(TEST) ! { dg-error "Invalid context for NULL" }
+ IF (TEST .EQ. NULL(TEST)) TEST=>NULL() ! { dg-error "Invalid context for NULL" }
+ IF (NULL(TEST) .EQ. TEST) TEST=>NULL() ! { dg-error "Invalid context for NULL" }
+END PROGRAM main