Set the length field on rls_span::Range

[skeleten]

This helps rls_vfs with updates, since the end field somtimes does
not contain the valid data (looking at you, emacs)

Fixes #280

related to rust-dev-tools/rls-vfs#12 and rust-dev-tools/rls-span#12

[sophiajt]

Restarting the CI build... I've tried manually bumping the versions the RLS uses, but I'm seeing some issues with not being able to get a successful cargo test.

Can you confirm that cargo test works with this PR? You may need to manually update some of the deps in Cargo.toml

[skeleten]

cargo test works for me manuallly. I did however change the racer dependency in rls to refer to "2.0" instead of the git repository, so that rls-vfs and rls use the same version which somehow broke for me

[skeleten]

It seems the test failures are caused by librustc_save_analysis still using the old versions of rls-span and rls-data. Bumping those fixes the test cases.

It seems RLS is peeking into the raw memory of rustc and there were some layout changes made to relevant structures in 0.2 of rls-data, introducing subtle bugs if we use different versions between the two.

[skeleten]

Closing this in favor of #283 being accepted :)