@Oli with latest master, two miri tests fail with "tried to dereference a function pointer". sounds familiar?
that would explain why the state went test-failed recently
the toolstate website blames https://github.com/rust-lang/rust/pull/56461
(3 other tests fail because
extern crate libc now requires a different feature gate. these are linux-only tests, which explains why windows stayed green for a little longer.)