dart: set meta.mainProgram (NixOS#342479)

Author: brianmcgee

pkgs/development/compilers/dart/default.nix

@@ -64,6 +64,7 @@ stdenv.mkDerivation (finalAttrs: {
       with C-style syntax. It offers compilation to JavaScript, interfaces,
       mixins, abstract classes, reified generics, and optional typing.
     '';
+    mainProgram = "dart";
     platforms = [ "x86_64-linux" "i686-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
     sourceProvenance = with sourceTypes; [ binaryNativeCode ];
     license = licenses.bsd3;