buildRustCrate: adding the description field

pkgs/build-support/rust/build-rust-crate/configure-crate.nix

@@ -5,6 +5,7 @@
 , completeBuildDeps
 , completeDeps
 , crateAuthors
+, crateDescription
 , crateFeatures
 , crateName
 , crateVersion
@@ -69,6 +70,7 @@ in ''
   export CARGO_PKG_NAME=${crateName}
   export CARGO_PKG_VERSION=${crateVersion}
   export CARGO_PKG_AUTHORS="${authors}"
+  export CARGO_PKG_DESCRIPTION="${crateDescription}"
 
   export CARGO_CFG_TARGET_ARCH=${stdenv.hostPlatform.parsed.cpu.name}
   export CARGO_CFG_TARGET_OS=${target_os}

pkgs/build-support/rust/build-rust-crate/default.nix

@@ -129,6 +129,7 @@ stdenv.mkDerivation (rec {
     build = crate.build or "";
     workspace_member = crate.workspace_member or ".";
     crateVersion = crate.version;
+    crateDescription = crate.description or "";
     crateAuthors = if crate ? authors && lib.isList crate.authors then crate.authors else [];
     crateType =
       if lib.attrByPath ["procMacro"] false crate then ["proc-macro"] else
@@ -140,7 +141,7 @@ stdenv.mkDerivation (rec {
     extraRustcOpts = (if crate ? extraRustcOpts then crate.extraRustcOpts else []) ++ extraRustcOpts_ ++ (lib.optional (edition != null) "--edition ${edition}");
 
     configurePhase = configureCrate {
-      inherit crateName buildDependencies completeDeps completeBuildDeps
+      inherit crateName buildDependencies completeDeps completeBuildDeps crateDescription
               crateFeatures libName build workspace_member release libPath crateVersion
               extraLinkFlags extraRustcOpts
               crateAuthors verbose colors target_os;