Support for GOTO def from *inside* files included with `include!` macro?

[cmyr]

so as of #14561, goto definition will now correctly locate tokens defined in a file that is included with the include! macro. This is wonderful.

Now there is the natural follow-up: would it be possible to have goto work within the generated file?

I can see some ways that this is complicated. In particular, there is potentially an N->1 relationship between include! invocations and their targets, which means that there could be different sets (of possibly overlapping) symbols in scope for a given included file. I would imagine that any possible implementation of this would need to be limited to the case where any single file is only included from a single other file.

So... I'm really not sure how feasible this is, but it seems at least like something that would be nice to have eventually.