pub const KTSTR_SCHEDULER_ALLOW_STALE_FALLBACK_ENV: &str = "KTSTR_SCHEDULER_ALLOW_STALE_FALLBACK";Expand description
Name of the presence-only opt-out env var that re-enables the
pre-built-binary fallback after a FAILED orchestrated scheduler
build. When set to a NON-EMPTY value, a failed cargo build -p <sched> in the non-cargo-test Discover path falls back to a
sibling / target/{debug,release}/ binary AS-IS instead of failing
the test. Default (unset / empty) REFUSES the stale fallback so a
build that fails for a new reason cannot silently validate the test
against an old scheduler. Empty-string rejection mirrors
KTSTR_CARGO_TEST_MODE (cargo_test_mode_active) — NOT the
presence-only KTSTR_ORCHESTRATED_ENV, which activates on an empty
value — so a stray KTSTR_SCHEDULER_ALLOW_STALE_FALLBACK= cannot
re-enable the hazard.