Missing diagnostic on CALLs using special register

[fm-117]

Describe the bug
Our parser currently allows use of LENGTH OF in CALLs without specifying passing style BY CONTENT. This is wrong in Cobol and should be signaled with a diagnostic (error level).

To Reproduce
(Type)Cobol code that cause the bug : (if any)

       IDENTIFICATION DIVISION.
       PROGRAM-ID. Pgm1.
       DATA DIVISION.
       LOCAL-STORAGE SECTION.
       01 txt   pic X(100).
       01 l     pic S9(5) comp-5.
       01 RC    pic 99.
       PROCEDURE DIVISION.
      *KO cannot use LENGTH OF by reference
           Call "SOMEPGM" USING txt
                   by reference length of txt
                                RC.
      
      *KO cannot use LENGTH OF by reference
           Call "SOMEPGM" USING txt
                                length of txt
                                RC.
      
      *Ok
           Call "SOMEPGM" USING txt
                   by content   length of txt
                   by reference RC.
      
       END PROGRAM Pgm1.

Expected behavior
Diagnostics on wrong lines with meaningful error message.

To discuss

• expected behavior for TypeCobol procedure calls
  • same as Cobol ?
  • allow the developer to omit the BY CONTENT but auto-generates it ?
• What about ADDRESS OF ?