reverse of autoload

[Juan Pablo Carbajal]

Hi,

Please find attached a change set that adds the option "remove" to autoload.

The function is extended to accept a third optional argument "remove"
that causes the function to be cleared and removed from autoload_map

The second argument is not used except for the checks (which are
unnecessary in the case of "remove"). So, I can redo the changes to
accept
autoload("foo","remove")

With the current check "remove" is not confused with a absolute path,
so it should produce no clash. Please, let me know.

Also, if "foo" is not in the autoload_map nothing is printed nor
returned. Shall I give a warning?

I did not know if symbol_table::clear_function removes the function
from memory thence there is a comment witha question mark. If that is
the right way of removing a function from memory please remove the
question mark.


Thanks

JPi

changeset_autoload
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