Hands-On Data Structures and Algorithms with Rust
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Profiles

When you run cargo build, cargo build --release, or cargo test, cargo uses profiles to determine individual settings for each stage. While these have reasonable defaults, you might want to customize some settings. The manifest provides these switches with the [profile.dev], [profile.release], [profile.test], and [profile.bench] sections:

[profile.release] 
opt-level = 3
debug = false
rpath = false
lto = false
debug-assertions = false
codegen-units = 16
panic = 'unwind'
incremental = false
overflow-checks = false

These values are the defaults (as of writing this book) and are already useful for most users.