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This type is useful for two things: * Doing non-local control flow with ucontext.h functions. * Inspecting machine state in a signal handler. The first use case is not one we support; we no longer expose bindings to those functions in the standard library. They're also deprecated in POSIX and, as a result, not available in musl. The second use case is valid, but is very poorly served by the standard library. As evidenced by my changes to std.debug.cpu_context.signal_context_t, users will be better served rolling their own ucontext_t and especially mcontext_t types which fit their specific situation. Further, these types tend to evolve frequently as architectures evolve, and the standard library has not done a good job keeping up, or even providing them for all supported targets.