Work around dart-lang/sdk#25348.

lib/src/executable.dart

Index: lib/src/executable.dart
diff --git a/lib/src/executable.dart b/lib/src/executable.dart
index 83880392dfb02f8828d8215ebf3cc4636735d506..7f9a9ae22902c2fa591fe7c8c96dd9e2e49dd3a8 100644
--- a/lib/src/executable.dart
+++ b/lib/src/executable.dart
@@ -141,7 +141,10 @@ Future<int> runExecutable(Entrypoint entrypoint, String package,
   process.stdout.listen(stdout.add);
   stdin.listen(process.stdin.add);
 
-  return process.exitCode;
+  // Work around dart-lang/sdk#25348.
+  process.stdin.done.catchError((_) {});
+
+  return await process.exitCode;
 }
 
 /// Returns the URL the VM should use to load the executable at [path].