Support using at toplevel in wrapped script

Allow refinements to be used at the toplevel within a script that is
loaded under a module.

Fixes [Bug #18960]

4 files changed, 31 insertions, 0 deletions

diff --git a/spec/ruby/core/main/fixtures/using.rb b/spec/ruby/core/main/fixtures/using.rb
new file mode 100644
index 0000000000..30713ef309
--- /dev/null
+++ b/spec/ruby/core/main/fixtures/using.rb
@@ -0,0 +1 @@
+using Module.new
diff --git a/spec/ruby/core/main/fixtures/using_in_main.rb b/spec/ruby/core/main/fixtures/using_in_main.rb
new file mode 100644
index 0000000000..a4a71c89cc
--- /dev/null
+++ b/spec/ruby/core/main/fixtures/using_in_main.rb
@@ -0,0 +1,5 @@
+MAIN = self
+
+module X
+  MAIN.send(:using, Module.new)
+end
diff --git a/spec/ruby/core/main/fixtures/using_in_method.rb b/spec/ruby/core/main/fixtures/using_in_method.rb
new file mode 100644
index 0000000000..d9ea2e9ef0
--- /dev/null
+++ b/spec/ruby/core/main/fixtures/using_in_method.rb
@@ -0,0 +1,5 @@
+def foo
+  using Module.new
+end
+
+foo
diff --git a/spec/ruby/core/main/using_spec.rb b/spec/ruby/core/main/using_spec.rb
index f9f709f7dc..8a23970c4b 100644
--- a/spec/ruby/core/main/using_spec.rb
+++ b/spec/ruby/core/main/using_spec.rb
@@ -129,4 +129,24 @@ describe "main.using" do
 
     x.call_bar(cls2.new).should == 'bar'
   end
+
+  it "raises error when called from method in wrapped script" do
+    -> do
+      load File.expand_path('../fixtures/using_in_method.rb', __FILE__), true
+    end.should raise_error(RuntimeError)
+  end
+
+  it "raises error when called on toplevel from module" do
+    -> do
+      load File.expand_path('../fixtures/using_in_main.rb', __FILE__), true
+    end.should raise_error(RuntimeError)
+  end
+
+  ruby_version_is "3.2" do
+    it "does not raise error when wrapped with module" do
+      -> do
+        load File.expand_path('../fixtures/using.rb', __FILE__), true
+      end.should_not raise_error
+    end
+  end
 end