On Tue, 9 May 2017 10:21:38 -0500, Tom Marchant wrote:
>
>How many languages had a PRAGMA directive when ASP was written in the 1960's?
> 
I see that as having been an excellent opportunity to innovate.
IBM often misses such opportunities.

The term "pragma[t]" appears to have originated with ALGOL-68.  But
processing directives are much older.  How long has assembler had a
PRINT directive, very similar in purpose to //* FORMAT?

On JES2-only or JES3-only constructs:

IIRC, there was an interval during which the JCL OUTPUT statement was
supported by JES2 but not by JES3.  What happened at that time if a
programmer attempted to run a JES2 job containing "OUTPUT" on JES3?

o OUTPUT was quietly ignored?

o OUTPUT was ignored except for a warning?

o Syntax error?

I consider the "quietly ignored" behavior the worst

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