github
diff --git a/‎test/ruby/test_module.rb
Lines changed: 38 additions & 0 deletions b/‎test/ruby/test_module.rb
Lines changed: 38 additions & 0 deletions
diff --git a/‎variable.c
Lines changed: 2 additions & 0 deletions b/‎variable.c
Lines changed: 2 additions & 0 deletions
diff --git a/‎version.h
Lines changed: 1 addition & 1 deletion b/‎version.h
Lines changed: 1 addition & 1 deletion
@@ -3353,6 +3353,44 @@ def test_module_clone_memory_leak
     CODE
   end
 
+  def test_set_temporary_name
+    m = Module.new
+    assert_nil m.name
+
+    m.const_set(:N, Module.new)
+
+    assert_match(/\A#<Module:0x\h+>::N\z/, m::N.name)
+    m::N.set_temporary_name(name = "fake_name_under_M")
+    name.upcase!
+    assert_equal("fake_name_under_M", m::N.name)
+    assert_raise(FrozenError) {m::N.name.upcase!}
+    m::N.set_temporary_name(nil)
+    assert_nil(m::N.name)
+
+    m.set_temporary_name(name = "fake_name")
+    name.upcase!
+    assert_equal("fake_name", m.name)
+    assert_raise(FrozenError) {m.name.upcase!}
+
+    m.set_temporary_name(nil)
+    assert_nil m.name
+
+    assert_raise_with_message(ArgumentError, "empty class/module name") do
+      m.set_temporary_name("")
+    end
+    %w[A A::B ::A ::A::B].each do |name|
+      assert_raise_with_message(ArgumentError, /must not be a constant path/) do
+        m.set_temporary_name(name)
+      end
+    end
+
+    [Object, User, AClass].each do |mod|
+      assert_raise_with_message(RuntimeError, /permanent name/) do
+        mod.set_temporary_name("fake_name")
+      end
+    end
+  end
+
   private
 
   def assert_top_method_is_private(method)
 
@@ -228,6 +228,8 @@ rb_mod_set_temporary_name(VALUE mod, VALUE name)
             rb_raise(rb_eArgError, "the temporary name must not be a constant path to avoid confusion");
         }
 
+        name = rb_str_new_frozen(name);
         // Set the temporary classpath to the given name:
         RCLASS_SET_CLASSPATH(mod, name, FALSE);
     }
 
@@ -11,7 +11,7 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 7
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 130
+#define RUBY_PATCHLEVEL 131
 
 #include "ruby/version.h"
 #include "ruby/internal/abi.h"
Original file line number	Diff line number	Diff line change
`@@ -228,6 +228,8 @@ rb_mod_set_temporary_name(VALUE mod, VALUE name)`
`228`	`228`	`rb_raise(rb_eArgError, "the temporary name must not be a constant path to avoid confusion");`
`229`	`229`	`}`
`230`	`230`
	`231`	`+ name = rb_str_new_frozen(name);`
	`232`	`+`
`231`	`233`	`// Set the temporary classpath to the given name:`
`232`	`234`	`RCLASS_SET_CLASSPATH(mod, name, FALSE);`
`233`	`235`	`}`