Precompile immutable globally-installed pub executables.

sdk/lib/_internal/pub/lib/src/command/run.dart

Index: sdk/lib/_internal/pub/lib/src/command/run.dart
diff --git a/sdk/lib/_internal/pub/lib/src/command/run.dart b/sdk/lib/_internal/pub/lib/src/command/run.dart
index 9881b6de19fa273d0f41797ff47e3ba4a3c4b5ed..d3591e64c59459b3500fbe5184b224375cad30c7 100644
--- a/sdk/lib/_internal/pub/lib/src/command/run.dart
+++ b/sdk/lib/_internal/pub/lib/src/command/run.dart
@@ -6,6 +6,8 @@ library pub.command.run;
 
 import 'dart:async';
 
+import 'package:path/path.dart' as p;
+
 import '../command.dart';
 import '../executable.dart';
 import '../io.dart';
@@ -34,9 +36,14 @@ class RunCommand extends PubCommand {
       var components = split1(executable, ":");
       package = components[0];
       executable = components[1];
+
+      if (p.split(executable).length > 1) {
+        usageError("Cannot run an executable in a subdirectory of a "
+            "dependency.");
+      }
     }
 
-    return runExecutable(this, entrypoint, package, executable, args)
+    return runExecutable(entrypoint, package, executable, args)
         .then(flushThenExit);
   }
 }