use clang + mold: experimental

.cargo/config.toml

@@ -2,4 +2,7 @@
 rustflags = [
   # (Nightly) Make the current crate share its generic instantiations
   "-Zshare-generics=y",
+  "-C",
+  "link-arg=-fuse-ld=mold",
 ]
+linker = "clang"

shell.nix

@@ -5,6 +5,8 @@ with pkgs;
 mkShell rec {
   nativeBuildInputs = [
     pkg-config
+    mold
+    clang
   ];
   buildInputs = [
     udev