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> On May 13, 2020, at 17:42, John P. Linderman <jpl.jpl@gmail.com> =
wrote:
>=20
> I never liked call by reference. When I was trying to understand a =
chunk of code, it was a great mental simplification to know that =
whatever a called routine did, it couldn't have an effect on the code I =
was trying to understand except through a returned value and (ghastly) =
global variables. ...

A Fortran implementation I used years ago kept constants in a "literal =
pool".  So, if you called a subroutine, passing in a constant, there was =
a possibility that the constant might be modified upon the routine's =
return.  I don't recall this ever causing a problem in practice, but the =
possibility was amusing...

-r