Change The Crate Lib Type

Before we move on, we need to change the crate type of our fuzz target's crate. Rust's build system supports many crate types, which you can read more about here . Add these two lines to your Cargo.toml file:

[lib]
crate-type = ["staticlib"]

For most normal rust libraries or crates, this is not necessary. However because we will be instrumenting this library for coverage feedback, we will need to build it separately and link it into our fuzzer. We'll discuss this further in the fuzzer section.

After changing the crate type, run cargo build and cargo test again to be sure everything is still working as expected.