16.3.2 References to Specific Names

In a scoping unit, a procedure name is established to be specific if it is not established to be generic and any of the following is true:

• The scoping unit contains an interface body with that procedure name.
  
  
• The scoping unit contains an internal procedure, module procedure, or statement function with that procedure name.
  
  
• The procedure name is the same as the name of a generic intrinsic procedure, and it is specified with the INTRINSIC attribute in that scoping unit.
  
  
• The procedure name is specified with the EXTERNAL attribute in that scoping unit.
  
  
• The procedure name is established to be specific in a module, and the scoping unit contains a USE statement making that procedure name accessible.
  
  
• The scoping unit contains no declarations for that procedure name, but the procedure name is established to be specific in a host scoping unit.

To resolve a reference to a procedure name established to be specific, the following rules are used in the order shown:

1. If either of the following is true, the dummy argument is a dummy procedure and the reference is to that dummy procedure:
   
   
   1. The scoping unit is a subprogram, and it contains an interface body with that procedure name.
      
      
   2. The procedure name has been declared EXTERNAL, and the procedure name is a dummy argument of that subprogram.

   The procedure invoked by the reference is the one supplied as the corresponding actual argument.

2. If the scoping unit contains an interface body or the procedure name has been declared EXTERNAL, and Rule 1 does not apply, the reference is to an external procedure with that name.
   
   
3. If the scoping unit contains an internal procedure or statement function with that procedure name, the reference is to that entity.
   
   
4. If the procedure name has been declared INTRINSIC in the scoping unit, the reference is to the intrinsic procedure with that name.
   
   
5. If the scoping unit contains a USE statement that makes the name of a module procedure accessible, the reference is to that procedure. (The USE statement allows renaming, so the name referenced may differ from the name of the module procedure.)
   
   
6. If none of the preceding rules apply, the reference is resolved by applying these rules to the host scoping unit.