Converts to use TAME's diagnostic panics, same as previous commits. Also
introduces impl for `Result`, which I apparently hadn't needed yet.
In the future, I hope trait impl specializations will be available to
automatically derive and expose span information in these diagnostic
messages for certain types.
DEV-13156
RSG (Ryan Specialty Group) recently announced a rename to Ryan Specialty (no
"Group"), but I'm not sure if the legal name has been changed yet or not, so
I'll wait on that.
These traits are intended to eliminate boilerplate, primarily in tests, in
situations where from/into is not expected to fail.
Given that TAMER must only panic for internal compiler errors, this should
not often be used outside of test cases. Further, there may be better
options in the future (e.g. QNames could be statically compiled rather than
trying to convert at runtime, in this case).
Mike Gerwitz