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And as you > said, what do we do if a panic can be removed through a particular > optimization - does it become mandatory to build the kernel? Is it > applicable to all architectures and (in the future) all supported > compilers? We have a very solid precedent for that: building the kernel already requires -O2 optimization for *functional* correctness. So Rust for Linux certainly can specify a certain set of build options that are required--including options that are normally considered optimizations. thanks, -- John Hubbard