[debugger] display message on repl(), do not display warnings on Ctrl+C

lib/_debugger.js

@@ -1009,8 +1009,22 @@ Interface.prototype.repl = function() {
 
   var self = this;
 
+  console.log('Press Ctrl + C to leave debug repl');
+
+  // Don't display any default messages
+  var listeners = this.repl.rli.listeners('SIGINT');
+  this.repl.rli.removeAllListeners('SIGINT');
+
   // Exit debug repl on Ctrl + C
   this.repl.rli.once('SIGINT', function() {
+    // Restore all listeners
+    process.nextTick(function() {
+      listeners.forEach(function(listener) {
+        self.repl.rli.on('SIGINT', listener);
+      });
+    });
+
+    // Exit debug repl
     self.exitRepl();
   });