Is there a way to change the key shortcut for choosing from lisp-implementations?

[mdbergmann]

According to the documentation the key shortcut for this is by prefixing M-x with M--.
But M-- I've bound to something else.

[monnier]

According to the documentation the key shortcut for this is by prefixing M-x with M--. But M-- I've bound to something else.

You can use `C--` and `C-u -`, I think.

[mdbergmann]

Yep, C-- also works. Thanks.