arm: the most specific exception type was ignored by raise

src/box/xlog.h

@@ -45,6 +45,7 @@ struct XlogError: public Exception
 {
 	XlogError(const char *file, unsigned line,
 		  const char *format, ...);
+	virtual void raise() { throw this; }
 protected:
 	XlogError(const struct type *type, const char *file, unsigned line,
 		  const char *format, ...);
@@ -55,6 +56,7 @@ struct XlogGapError: public XlogError
 	XlogGapError(const char *file, unsigned line,
 		  const struct vclock *from,
 		  const struct vclock *to);
+	virtual void raise() { throw this; }
 };
 
 /* {{{ log dir */

src/exception.h

@@ -43,11 +43,7 @@ class Exception: public diag_msg {
 public:
 	void *operator new(size_t size);
 	void operator delete(void*);
-	virtual void raise()
-	{
-		/* Throw the most specific type of exception */
-		throw this;
-	}
+	virtual void raise() = 0;
 
 	const char *
 	errmsg() const
@@ -84,10 +80,7 @@ extern const struct type type_SystemError;
 class SystemError: public Exception {
 public:
 
-	virtual void raise()
-	{
-		throw this;
-	}
+	virtual void raise() { throw this; }
 
 	int
 	errnum() const
@@ -119,12 +112,14 @@ class OutOfMemory: public SystemError {
 	OutOfMemory(const char *file, unsigned line,
 		    size_t amount, const char *allocator,
 		    const char *object);
+	virtual void raise() { throw this; }
 };
 
 extern const struct type type_TimedOut;
 class TimedOut: public SystemError {
 public:
 	TimedOut(const char *file, unsigned line);
+	virtual void raise() { throw this; }
 };
 
 /** \endcond */

src/fiber.h

@@ -98,6 +98,7 @@ class FiberCancelException: public Exception {
 	virtual void log() const {
 		say_debug("FiberCancelException");
 	}
+	virtual void raise() { throw this; }
 };
 #endif /* defined(__cplusplus) */
 

src/lua/utils.h

@@ -509,6 +509,7 @@ class LuajitError: public Exception {
 public:
 	LuajitError(const char *file, unsigned line,
 		    struct lua_State *L);
+	virtual void raise() { throw this; }
 };
 
 static inline void