debug: add a breakpoint before unhandled aborts

debug.cpp

@@ -71,6 +71,11 @@ warn (const char *msg)
 ////////////////////////////////////////////////////////////////////////////////
 static void abort_with_trace (void)
 {
+    // Manually trigger a breakpoint if possible so that the debugger won't
+    // silently dump us some place without further information.
+    // eg, CLion/GDB/Win32 silently dropping us out of the session.
+    breakpoint ();
+
     // If this is because of an exception we may as well rethrow and hope that
     // the system will print exception data during the abort process.
     //