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This PR locks the version of the
nightly
Rust toolchain used to build the open systems simulator, preventing upstream changes from breaking builds until we are ready to upgrade to more recent nightly builds. In particular, the removal ofstd::error::Error::backtrace
from the#![feature(backtrace)]
feature caused a recent breakage, such that we can restore PR by locking before rust-lang/rust#99431 landed — it would be good to update to use the new provider API instead, but for now, locking the toolchain allows us to restore the build.