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Jeong, YunWon
3364c47a4b
Nightly miri now flags `fn_ptr as usize` and direct `fn_ptr == fn_ptr` as UB because both paths go through `FnPtr::addr()`, which attempts to dereference a function pointer's provenance — function items have no backing allocation in miri's model. Add `fn_addr<T>(f: T) -> usize` that uses `transmute_copy` to read the address as plain integer bytes without triggering provenance checks. Replace all `f as usize` slot comparison patterns across the codebase with `fn_addr(f)`. Also add `-Zmiri-permissive-provenance` to CI MIRIFLAGS as a safety net for any remaining integer-pointer round-trips elsewhere. Assisted-by: Claude