Brendan Friel asks:

> 1) Has it always been  a farce ?

Yes. At least since 1974.

> 2) Are there lots of other scenarios where it doesn't 
>    work ?

Yes. Several have been elucidated here, already.

> 3) What is exactly is the root cause of this farcical
>    behavior ? The DISP=SH example should be easily 
>    flagged as an error in any programming environment. 

This, too, has already been covered. TYPRUN=SCAN simply
says (to JES): "Be a good boy here will you and run this
JCL through the converter, OK?" That's it. That's _all_
it does. That's all it has _ever_ done. Nothing else. 

Accordingly, it is the case that only errors that _can_
be found by the converter _will_ be found. Errors that
can be found _only_ by the interpreter will (obviously)
_not_ be found (simply because the interpreter will not
get involved). And, in addition to that, errors that 
can only be found by the initiator will also _not_ be
found (simply because the initiator will _also_ not get 
involved).

--
WB

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