Trying to debug dart2js code

[Rat Jo]

Hi,

I'm trying to debug dart2js code, but I have problem setting breakpoints. 

All the code is made in a way that all functions is attribute of object:

["main_server", "main.dart", , K, {
  "^": "",
  main: function() {
    var t1, express, path, app, list_sql_table, t2, sql_table;
    t1 = $.get$context();
    express = J.$index$asx(t1, "nodejs").callMethod$2("require", ["express.io"]);
    path = J.$index$asx(t1, "nodejs").callMethod$2("require", ["path"]);
    }
    P.print("Listening on port " + H.S($.port) + "... (open your browser at localhost: " + H.S($.port) + ")");
    app.callMethod$2("listen", [$.port]);
  }
},
1],
]);
Isolate.$finishClasses($$, $, null);
$$ = null;

When I try to set breakpoint at the line "t1 = $.get$context();", it just doesn't allow me set the breakpoint at the last line.

Jo