I believe there is currently a bug in the MemorySanitizer, when we pass
various types across the FFI boundry MSAN gives a unititialized variable
error:
- `usize` passed as `size_t` (cannot be uninitialized)
- byte slice passed as `const char *`
In order to let other work continue disable the MSAN job.
If we pin the version of nightly to a specific date then `cargo
+nightly` will stop working. And even locally, if you want to use a
specific version of nightly, you can't if the script is overriding your
version with "+nightly". Instead the user should set RUSTUP_TOOLCHAIN.