See official documentation on this function here.
Overriding Rust derivation
Due to the complexity of buildRustPackage you cannot merely use overrideAttrs to override a Rust derivation. For version changes in particular, you must also override the cargoDeps attribute (see here).
For example, to override pkgs.just to a later release,
self: super: {
just = super.just.overrideAttrs (oa: rec {
name = "${oa.pname}-${version}";
version = "1.27.0";
src = super.fetchFromGitHub {
owner = "casey";
repo = oa.pname;
rev = "refs/tags/${version}";
hash = "sha256-xyiIAw8PGMgYPtnnzSExcOgwG64HqC9TbBMTKQVG97k=";
};
# Overriding `cargoHash` has no effect; we must override the resultant
# `cargoDeps` and set the hash in its `outputHash` attribute.
cargoDeps = oa.cargoDeps.overrideAttrs (super.lib.const {
name = "${name}-vendor.tar.gz";
inherit src;
outputHash = "sha256-jMurOCr9On+sudgCzIBrPHF+6jCE/6dj5E106cAL2qw=";
});
doCheck = false;
});
}