Can't get rust-analyzer to work in vscode within the rust repository

Following I can't get rust-analyzer to run check on save

Running manually works fine

I'm on the current tip of master branch, commit

The error seems to be

Method: rust-analyzer/analyzerStatus
 error: invalid type: sequence, expected unit', /rustc/04488afe34512aa4c33566eb16d8c912a3ae04f9\src\libstd\

I wasn't allowed to post more than two links so here are my logs:

server output:
client output:

These logs are using the nightly option, I got a similar thing using stable

I haven't managed to figure out how to set RUST_BACKTRACE for the extension