C++ language's successor

What language is the best candidate to replace C++ after 35 years of existence and millions of crashes due to its unsafe syntax?

A successor to C++ must produce very fast applications and code working on all platforms. But we can also speak of succession to a language that uses exactly the same syntax then C, adds classes and provides more advanced functions. So, a modern C++ even if it is not intended to replace it everywhere.

Vala (2002)

Available at Gnome, look like a demonstration of GObject, written by the same team. Vala replace C++ on the Gnome platform.

Features:

Simple example:

int main () {      
   print ("Hello World\n");         
   return 0;  
}

Class:

class Hello : Object {      
    void bye () {          
          stdout.printf ("Hello World\n");     
    }  
} 
   
var example = new Hello ();
example.bye(); 

D (2001)

Designed as an alternative to C++ with simplifications such as dynamic arrays.

Simple example:

import std.stdio;     

void main()  {     
    writeln("Hello World!);
}

Class:

class Hello  {
  char[] content;
  this(char[] str)   {        // constructeur 
    content = str;
  }

 void display()  { 
   writeln(content);      
 }
}

Hello hello = new Hello("Hello World!");

C# (2000)

Since the Roslyn platform, available on GitHub, C# can be compiled into binary code rather than bytecode, and it can access the system resources, so even if it was originally an alternative to Java, it becomes a possible replacement to C++, for applications where the garbage collector is not a drawback.

Features:

Simple example:

void Main() {
    Console.WriteLine("Hello, World!");     
}

Class:

public Class Point : Shape 
{
   public int x, y;
   Point(int x, int y) {
      this.x = x; 
      this.y = y;
   }
   public void move(int w, int h) {
      this.x += x;
      this.y += h;
   }
}

Point p = new Point(0,0);
p.move(100,50);

Dart (2013)

Designed as an alternative to JavaScript with the syntax of C, this is not a system language, but it can replace C++ for scripting on the server or the desktop with a speed close to that of Asm.js.

Simple example:

void main() {    
   print('Hello World!');  
}

Class:

class Point {
   num x, y;
   Point(this.x, this.y);   // constructeur
   void move(num xo, num yo) {     
     x += xo;
     y += yo;
  }
}

var p = new Point(0, 0);
p.move(100, 50);

Other languages

There are other languages ​​derived from C or to have a vocation to replace C++ as system language.

Finally, what successor to C or C++? If we rely on the classification of languages ​​by popularity, none yet! C remains the most widely used language and C++ stands in third place, after Java and before C#.
The emerging trend is that a set of languages, each in a specific field: game development, web application, scripting, etc ... may very well together replace C++, a universal language that can not be replaced everywhere by a single language.
This gives its only real advantage to the syntax derived from C: the programmer can pass more easily from one language to the other to make different types of applications.