WARN_CREATE_GLOBAL and parameters used by the shell

[Vincent Lefevre <vincent@xxxxxxxxxx>]

I think that when WARN_CREATE_GLOBAL is set, one should get no warnings
for parameters used by the shell, as their intent is to be global.

For instance:

cventin% setopt WARN_CREATE_GLOBAL
cventin% foo() { RPS1="<" }
cventin% foo
foo: scalar parameter RPS1 created globally in function

There is no such problem with PS1, PS2, PS3 and PS4, probably because
they are already set by zsh.

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Vincent Lefèvre <vincent@xxxxxxxxxx> - Web: <https://www.vinc17.net/>
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