Hints on rustbites

90. black_box — Stop the Compiler From Erasing Your Benchmarks

Sun, 19 Apr 2026 09:00:00 +0100

Your benchmark ran in 0 nanoseconds? Congratulations — the compiler optimised away the code you were trying to measure. std::hint::black_box prevents that by hiding values from the optimiser.

89. cold_path — Tell the Compiler Which Branch Won't Happen

Sat, 18 Apr 2026 17:00:00 +0100

Your error-handling branch fires once in a million calls, but the compiler doesn’t know that. core::hint::cold_path lets you mark unlikely branches so the optimiser can focus on the hot path.