Ark: signature_help() issue with ... arguments

[DavisVaughan]

If you type options(scipen = 2, <tab>) then you'll get a list of additional options to autocomplete.

If you type options(2, <tab>) then you won't get anything, and Rust is actually panicking under the hood.

Something is wrong with how signature_help() tags the ... option in the second case.

Notice how in the second image, it tries to get() an index of 2, but the parameters is only length 1 (the ... argument is the only parameter).