Improve ArgumentError message for Module#set_temporary_name

2 files changed, 5 insertions, 5 deletions

diff --git a/spec/ruby/core/module/set_temporary_name_spec.rb b/spec/ruby/core/module/set_temporary_name_spec.rb
index 93a02a4143..f5886a3398 100644
--- a/spec/ruby/core/module/set_temporary_name_spec.rb
+++ b/spec/ruby/core/module/set_temporary_name_spec.rb
@@ -29,14 +29,14 @@ ruby_version_is "3.3" do
 
     it "can't assign a constant name as a temporary name" do
       m = Module.new
-      -> { m.set_temporary_name("Object") }.should raise_error(ArgumentError, "name must not be valid constant path")
+      -> { m.set_temporary_name("Object") }.should raise_error(ArgumentError, "the temporary name must not be a constant path to avoid confusion")
     end
 
     it "can't assign a constant path as a temporary name" do
       m = Module.new
-      -> { m.set_temporary_name("A::B") }.should raise_error(ArgumentError, "name must not be valid constant path")
-      -> { m.set_temporary_name("::A") }.should raise_error(ArgumentError, "name must not be valid constant path")
-      -> { m.set_temporary_name("::A::B") }.should raise_error(ArgumentError, "name must not be valid constant path")
+      -> { m.set_temporary_name("A::B") }.should raise_error(ArgumentError, "the temporary name must not be a constant path to avoid confusion")
+      -> { m.set_temporary_name("::A") }.should raise_error(ArgumentError, "the temporary name must not be a constant path to avoid confusion")
+      -> { m.set_temporary_name("::A::B") }.should raise_error(ArgumentError, "the temporary name must not be a constant path to avoid confusion")
     end
 
     it "can't assign name to permanent module" do
diff --git a/variable.c b/variable.c
index 79ff8c459c..750ff04e1d 100644
--- a/variable.c
+++ b/variable.c
@@ -230,7 +230,7 @@ rb_mod_set_temporary_name(VALUE mod, VALUE name)
         }
 
         if (is_constant_path(name)) {
-            rb_raise(rb_eArgError, "name must not be valid constant path");
+            rb_raise(rb_eArgError, "the temporary name must not be a constant path to avoid confusion");
         }
 
         // Set the temporary classpath to the given name: