1 files changed, 13 insertions, 1 deletions
diff --git a/src/tools/tool-options.h b/src/tools/tool-options.h
index 0522b5538..02b825079 100644
--- a/src/tools/tool-options.h
+++ b/src/tools/tool-options.h
@@ -156,7 +156,19 @@ struct ToolOptions : public Options {
            Options::Arguments::Zero,
            [](Options* o, const std::string& argument) {
              setTypeSystem(TypeSystem::Isorecursive);
-           });
+           })
+      .add(
+        "--closed-world",
+        "-cw",
+        "Assume code outside of the module does not inspect or interact with "
+        "GC and function references, even if they are passed out. The outside "
+        "may hold on to them and pass them back in, but not inspect their "
+        "contents or call them.",
+        ToolOptionsCategory,
+        Options::Arguments::Zero,
+        [this](Options*, const std::string&) {
+          passOptions.closedWorld = true;
+        });
   }
 
   ToolOptions& addFeature(FeatureSet::Feature feature,