diff --git a/src/nostalgia/common/bounds.cpp b/src/nostalgia/common/bounds.cpp
index ba0aefc4..2f9b61e4 100644
--- a/src/nostalgia/common/bounds.cpp
+++ b/src/nostalgia/common/bounds.cpp
@@ -7,8 +7,7 @@
  */
 #include "bounds.hpp"
 
-namespace nostalgia {
-namespace common {
+namespace nostalgia::common {
 
 Bounds::Bounds(int x, int y, int w, int h) {
 	this->x = x;
@@ -42,4 +41,3 @@ Point Bounds::pt2() {
 }
 
 }
-}
diff --git a/src/nostalgia/common/bounds.hpp b/src/nostalgia/common/bounds.hpp
index e8e81d90..62dce658 100644
--- a/src/nostalgia/common/bounds.hpp
+++ b/src/nostalgia/common/bounds.hpp
@@ -9,8 +9,7 @@
 
 #include "point.hpp"
 
-namespace nostalgia {
-namespace common {
+namespace nostalgia::common {
 
 class Bounds {
 	public:
@@ -48,4 +47,3 @@ ox::Error model(T *io, Bounds *obj) {
 }
 
 }
-}
diff --git a/src/nostalgia/common/point.cpp b/src/nostalgia/common/point.cpp
index c0cdc5f2..a339b8a9 100644
--- a/src/nostalgia/common/point.cpp
+++ b/src/nostalgia/common/point.cpp
@@ -7,8 +7,7 @@
  */
 #include "point.hpp"
 
-namespace nostalgia {
-namespace common {
+namespace nostalgia::common {
 
 Point::Point() {
 }
@@ -122,4 +121,3 @@ Point Point::operator/=(int i) {
 }
 
 }
-}
diff --git a/src/nostalgia/common/point.hpp b/src/nostalgia/common/point.hpp
index 5f0ee73e..3d968cdc 100644
--- a/src/nostalgia/common/point.hpp
+++ b/src/nostalgia/common/point.hpp
@@ -10,8 +10,7 @@
 
 #include <ox/std/error.hpp>
 
-namespace nostalgia {
-namespace common {
+namespace nostalgia::common {
 
 class Point {
 	public:
@@ -68,4 +67,3 @@ ox::Error model(T *io, Point *obj) {
 }
 
 }
-}
diff --git a/src/nostalgia/studio/lib/json_err.hpp b/src/nostalgia/studio/lib/json_err.hpp
index 067636fa..21c5cea2 100644
--- a/src/nostalgia/studio/lib/json_err.hpp
+++ b/src/nostalgia/studio/lib/json_err.hpp
@@ -8,8 +8,7 @@
 
 #pragma once
 
-namespace nostalgia {
-namespace studio {
+namespace nostalgia::studio {
 
 enum {
 	JSON_ERR_FIELD_MISSING = 1,
@@ -17,4 +16,3 @@ enum {
 };
 
 }
-}
diff --git a/src/nostalgia/studio/lib/json_read.cpp b/src/nostalgia/studio/lib/json_read.cpp
index 2561f035..7b4dd776 100644
--- a/src/nostalgia/studio/lib/json_read.cpp
+++ b/src/nostalgia/studio/lib/json_read.cpp
@@ -8,8 +8,7 @@
 
 #include "json_read.hpp"
 
-namespace nostalgia {
-namespace studio {
+namespace nostalgia::studio {
 
 JsonReader::JsonReader(QJsonObject &obj): m_src(obj) {
 }
@@ -86,4 +85,3 @@ ox::Error JsonReader::field(QJsonValueRef src, QString *dest) {
 
 
 }
-}
diff --git a/src/nostalgia/studio/lib/oxfstreeview.hpp b/src/nostalgia/studio/lib/oxfstreeview.hpp
index fd55e54e..05da5c35 100644
--- a/src/nostalgia/studio/lib/oxfstreeview.hpp
+++ b/src/nostalgia/studio/lib/oxfstreeview.hpp
@@ -14,8 +14,7 @@
 
 #include <ox/fs/fs.hpp>
 
-namespace nostalgia {
-namespace studio {
+namespace nostalgia::studio {
 
 class OxFSFile {
 	private:
@@ -82,4 +81,3 @@ class OxFSModel: public QAbstractItemModel {
 };
 
 }
-}
diff --git a/src/nostalgia/studio/lib/plugin.cpp b/src/nostalgia/studio/lib/plugin.cpp
index d495dffb..6fd75211 100644
--- a/src/nostalgia/studio/lib/plugin.cpp
+++ b/src/nostalgia/studio/lib/plugin.cpp
@@ -8,8 +8,7 @@
 
 #include "plugin.hpp"
 
-namespace nostalgia {
-namespace studio {
+namespace nostalgia::studio {
 
 QVector<WizardMaker> Plugin::newWizards(const Context*) {
 	return {};
@@ -24,4 +23,3 @@ QWidget *Plugin::makeEditor(QString, const Context*) {
 }
 
 }
-}
diff --git a/src/nostalgia/studio/lib/plugin.hpp b/src/nostalgia/studio/lib/plugin.hpp
index 717933bc..a8e19d67 100644
--- a/src/nostalgia/studio/lib/plugin.hpp
+++ b/src/nostalgia/studio/lib/plugin.hpp
@@ -19,8 +19,7 @@
 #include "project.hpp"
 #include "wizard.hpp"
 
-namespace nostalgia {
-namespace studio {
+namespace nostalgia::studio {
 
 struct Context {
 	QWidget *tabParent = nullptr;
@@ -46,7 +45,6 @@ class Plugin {
 
 };
 
-}
 }
 
 #define PluginInterface_iid "net.drinkingtea.nostalgia.studio.Plugin"
diff --git a/src/nostalgia/studio/lib/project.hpp b/src/nostalgia/studio/lib/project.hpp
index be27d2da..bc658401 100644
--- a/src/nostalgia/studio/lib/project.hpp
+++ b/src/nostalgia/studio/lib/project.hpp
@@ -15,8 +15,7 @@
 #include <ox/fs/fs.hpp>
 #include <ox/mc/mc.hpp>
 
-namespace nostalgia {
-namespace studio {
+namespace nostalgia::studio {
 
 class Project: public QObject {
 	Q_OBJECT
@@ -75,4 +74,3 @@ ox::Error Project::writeObj(QString path, T *obj) const {
 }
 
 }
-}
diff --git a/src/nostalgia/studio/lib/wizard.cpp b/src/nostalgia/studio/lib/wizard.cpp
index c008de3b..b9779643 100644
--- a/src/nostalgia/studio/lib/wizard.cpp
+++ b/src/nostalgia/studio/lib/wizard.cpp
@@ -18,8 +18,7 @@
 #include "plugin.hpp"
 #include "wizard.hpp"
 
-namespace nostalgia {
-namespace studio {
+namespace nostalgia::studio {
 
 using std::function;
 
@@ -343,4 +342,3 @@ void Wizard::accept() {
 }
 
 }
-}
diff --git a/src/nostalgia/studio/lib/wizard.hpp b/src/nostalgia/studio/lib/wizard.hpp
index b7b73a3b..ae1f2b09 100644
--- a/src/nostalgia/studio/lib/wizard.hpp
+++ b/src/nostalgia/studio/lib/wizard.hpp
@@ -19,8 +19,7 @@
 #include <QVector>
 #include <QWizard>
 
-namespace nostalgia {
-namespace studio {
+namespace nostalgia::studio {
 
 struct WizardMaker {
 	QString name;
@@ -132,4 +131,3 @@ class Wizard: public QWizard {
 };
 
 }
-}
diff --git a/src/nostalgia/studio/mainwindow.cpp b/src/nostalgia/studio/mainwindow.cpp
index ea6eceef..22f8e34c 100644
--- a/src/nostalgia/studio/mainwindow.cpp
+++ b/src/nostalgia/studio/mainwindow.cpp
@@ -29,8 +29,7 @@
 
 #include "mainwindow.hpp"
 
-namespace nostalgia {
-namespace studio {
+namespace nostalgia::studio {
 
 const QString MainWindow::StateFilePath = "studio_state.json";
 
@@ -375,4 +374,3 @@ void MainWindow::refreshProjectExplorer(QString path) {
 }
 
 }
-}
diff --git a/src/nostalgia/studio/mainwindow.hpp b/src/nostalgia/studio/mainwindow.hpp
index b60e4572..08cb9f8b 100644
--- a/src/nostalgia/studio/mainwindow.hpp
+++ b/src/nostalgia/studio/mainwindow.hpp
@@ -27,8 +27,7 @@
 #include "lib/plugin.hpp"
 #include "lib/project.hpp"
 
-namespace nostalgia {
-namespace studio {
+namespace nostalgia::studio {
 
 struct NostalgiaStudioState {
 	QString projectPath;
@@ -145,4 +144,3 @@ class MainWindow: public QMainWindow {
 };
 
 }
-}
diff --git a/src/nostalgia/world/studio/consts.cpp b/src/nostalgia/world/studio/consts.cpp
index 2362f6b7..24c60ab7 100644
--- a/src/nostalgia/world/studio/consts.cpp
+++ b/src/nostalgia/world/studio/consts.cpp
@@ -8,10 +8,8 @@
 
 #include "consts.hpp"
 
-namespace nostalgia {
-namespace world {
+namespace nostalgia::world {
 
 QString PATH_ZONES = "/World/Zones/";
 
 }
-}
diff --git a/src/nostalgia/world/studio/consts.hpp b/src/nostalgia/world/studio/consts.hpp
index ed2b8637..6ff5232a 100644
--- a/src/nostalgia/world/studio/consts.hpp
+++ b/src/nostalgia/world/studio/consts.hpp
@@ -10,10 +10,8 @@
 
 #include <QString>
 
-namespace nostalgia {
-namespace world {
+namespace nostalgia::world {
 
 extern QString PATH_ZONES;
 
 }
-}
diff --git a/src/nostalgia/world/studio/newworldwizard.cpp b/src/nostalgia/world/studio/newworldwizard.cpp
index e35e014a..e6402001 100644
--- a/src/nostalgia/world/studio/newworldwizard.cpp
+++ b/src/nostalgia/world/studio/newworldwizard.cpp
@@ -11,8 +11,7 @@
 #include "consts.hpp"
 #include "newworldwizard.hpp"
 
-namespace nostalgia {
-namespace world {
+namespace nostalgia::world {
 
 using namespace studio;
 
@@ -21,15 +20,14 @@ const QString NewWorldWizard::FIELD_WORLD_PATH = "World.WorldPath";
 NewWorldWizard::NewWorldWizard(const Context *ctx) {
 	addLineEdit(tr("&Name:"), FIELD_WORLD_PATH, "", [this, ctx](QString worldName) {
 			worldName = PATH_ZONES + worldName;
-			if (ctx->project->stat(worldName).inode == 0) {
-				return 0;
-			} else {
+			auto [stat, err] = ctx->project->stat(worldName);
+			if (err) {
 				this->showValidationError(tr("World already exists: %1").arg(worldName));
 				return 1;
 			}
+			return 0;
 		}
 	);
 }
 
 }
-}
diff --git a/src/nostalgia/world/studio/newworldwizard.hpp b/src/nostalgia/world/studio/newworldwizard.hpp
index a2286501..07f9a1ce 100644
--- a/src/nostalgia/world/studio/newworldwizard.hpp
+++ b/src/nostalgia/world/studio/newworldwizard.hpp
@@ -12,8 +12,7 @@
 
 #include <nostalgia/studio/studio.hpp>
 
-namespace nostalgia {
-namespace world {
+namespace nostalgia::world {
 
 struct NewWorldWizard: public studio::WizardFormPage {
 
@@ -24,4 +23,3 @@ struct NewWorldWizard: public studio::WizardFormPage {
 };
 
 }
-}
diff --git a/src/nostalgia/world/studio/worldeditor.hpp b/src/nostalgia/world/studio/worldeditor.hpp
index 7de40447..1871665c 100644
--- a/src/nostalgia/world/studio/worldeditor.hpp
+++ b/src/nostalgia/world/studio/worldeditor.hpp
@@ -10,8 +10,7 @@
 
 #include <nostalgia/studio/studio.hpp>
 
-namespace nostalgia {
-namespace world {
+namespace nostalgia::world {
 
 class WorldEditor: public QWidget {
 
@@ -21,4 +20,3 @@ class WorldEditor: public QWidget {
 };
 
 }
-}
diff --git a/src/nostalgia/world/studio/worldstudioplugin.cpp b/src/nostalgia/world/studio/worldstudioplugin.cpp
index 4c0b14b9..7e2c9940 100644
--- a/src/nostalgia/world/studio/worldstudioplugin.cpp
+++ b/src/nostalgia/world/studio/worldstudioplugin.cpp
@@ -16,8 +16,7 @@
 
 #include "worldstudioplugin.hpp"
 
-namespace nostalgia {
-namespace world {
+namespace nostalgia::world {
 
 using namespace studio;
 
@@ -32,11 +31,10 @@ QVector<WizardMaker> WorldEditorPlugin::newWizards(const Context *ctx) {
 				qDebug() << "creating Region";
 				auto path = PATH_ZONES + w->field(NewWorldWizard::FIELD_WORLD_PATH).toString();
 				Region rgn;
-				auto err = ctx->project->mkdir(PATH_ZONES);
+				oxReturnError(ctx->project->mkdir(PATH_ZONES));
 				ctx->project->saveRomFs();
-				qDebug() << "err:" << err;
-				err |= ctx->project->writeObj(path, &rgn);
-				return err;
+				oxReturnError(ctx->project->writeObj(path, &rgn));
+				return OxError(0);
 			}
 		}
 	};
@@ -51,4 +49,3 @@ QWidget *WorldEditorPlugin::makeEditor(QString path, const Context *ctx) {
 }
 
 }
-}
diff --git a/src/nostalgia/world/studio/worldstudioplugin.hpp b/src/nostalgia/world/studio/worldstudioplugin.hpp
index 26ce9154..40cfd53f 100644
--- a/src/nostalgia/world/studio/worldstudioplugin.hpp
+++ b/src/nostalgia/world/studio/worldstudioplugin.hpp
@@ -12,8 +12,7 @@
 
 #include <nostalgia/studio/studio.hpp>
 
-namespace nostalgia {
-namespace world {
+namespace nostalgia::world {
 
 class WorldEditorPlugin: public QObject, public studio::Plugin {
 	Q_OBJECT
@@ -28,4 +27,3 @@ class WorldEditorPlugin: public QObject, public studio::Plugin {
 };
 
 }
-}