implement move constructor

apps/openmw/mwscript/scriptmanagerimp.cpp

@@ -171,7 +171,7 @@ namespace MWScript
         {
             Compiler::Locals locals;
 
-            Compiler::ContextRestore restore = mErrorHandler.setContext(name2 + "[local variables]", true);
+            const Compiler::ContextRestore&& restore = mErrorHandler.setContext(name2 + "[local variables]", true);
 
             std::istringstream stream (script->mScriptText);
             Compiler::QuickFileParser parser (mErrorHandler, mCompilerContext, locals);

components/compiler/streamerrorhandler.cpp

@@ -72,6 +72,11 @@ namespace Compiler
 
     ContextRestore::ContextRestore(StreamErrorHandler* handler, const std::string& context) : mHandler(handler), mContext(context) {}
 
+    ContextRestore::ContextRestore(ContextRestore&& other) : mHandler(other.mHandler), mContext(other.mContext)
+    {
+        other.mHandler = nullptr;
+    }
+
     ContextRestore::~ContextRestore()
     {
         if(mHandler)

components/compiler/streamerrorhandler.hpp

@@ -42,6 +42,8 @@ namespace Compiler
         public:
             ContextRestore (StreamErrorHandler* handler, const std::string& context);
 
+            ContextRestore (ContextRestore&& other);
+
             ~ContextRestore();
     };
 }