Keep the double colons when constructing the module name

frame/support/procedural/src/construct_runtime/parse.rs

@@ -192,7 +192,7 @@ impl PalletPath {
 	pub fn module_name(&self) -> String {
 		self.inner.segments.iter().fold(String::new(), |mut acc, segment| {
 			if !acc.is_empty() {
-				acc.push('_');
+				acc.push_str("::");
 			}
 			acc.push_str(&segment.ident.to_string());
 			acc

frame/support/test/tests/construct_runtime.rs

@@ -968,12 +968,12 @@ fn pallet_in_runtime_is_correct() {
 
 	assert_eq!(PalletInfo::index::<NestedModule3>().unwrap(), 34);
 	assert_eq!(PalletInfo::name::<NestedModule3>().unwrap(), "NestedModule3");
-	assert_eq!(PalletInfo::module_name::<NestedModule3>().unwrap(), "nested_module3");
+	assert_eq!(PalletInfo::module_name::<NestedModule3>().unwrap(), "nested::module3");
 	assert_eq!(PalletInfo::crate_version::<NestedModule3>().unwrap(), CrateVersion::new(3, 0, 0));
 
 	assert_eq!(PalletInfo::index::<Module3>().unwrap(), 35);
 	assert_eq!(PalletInfo::name::<Module3>().unwrap(), "Module3");
-	assert_eq!(PalletInfo::module_name::<Module3>().unwrap(), "self_module3");
+	assert_eq!(PalletInfo::module_name::<Module3>().unwrap(), "self::module3");
 	assert_eq!(PalletInfo::crate_version::<Module3>().unwrap(), CrateVersion::new(3, 0, 0));
 
 	assert_eq!(PalletInfo::index::<Module1_3>().unwrap(), 6);