title: Cannot import defined variables from Dart file to an another
body: <p>I have defined the int c in a dart file called (main.dart)
  I want to use this variable in another Dart file called (ex.dart). The both dart files are in the same directory (bin)
  I used this code (import 'main.dart';) also this (import './main.dart';) . But it gives me this Error: Getter not found: 'c'.
  it could not define c , although it was previously defined in (main.dart) file.
  any one can help ?</p>