[Bug guile/17203] It should be an error to register a pre-existing parameter.

["xdje42 at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17203

--- Comment #4 from Doug Evans <xdje42 at gmail dot com> ---
On a related topic,

One thing I'd like to add is the ability to export native gdb parameters to
Scheme.
One reason is I'd like to write a function that executes a gdb command with a
parameter temporarily set to a specified value.  In order to easily do that,
i.e., without having to have a lot of parameter-specific code, I want to be
able to read and write parameters from Scheme and not using gdb set/show
commands.
Implementing this will involve a bit of work for parameters that post-process
writes.

The point of noting this here is that in this case we're not registering a new
parameter (using the parlance of "register-parameter!"), just exporting to
Scheme an existing one.

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