yes

shells/go/flake.nix

@@ -18,6 +18,7 @@
             GOPATH="${go}";
             buildInputs = [
               go
+              gopls
             ];
 
             shellHook = ''

shells/rust/flake.nix

@@ -34,6 +34,7 @@
             gtk3
             librsvg
             xdotool
+            rustfmt
           ];
 
           # RUSTC_VERSION = overrides.toolchain.channel;