Strange runtime type error in dart

strange type error

/tmp$ dart --version
Dart VM version: 0.8.5.1_r28990 (Tue Oct 22 04:50:58 2013) on "linux_x64"

/tmp$ dartanalyzer test.dart 
Analyzing test.dart...
No issues found

/tmp$ dart -c test.dart 
Unhandled exception:
type 'int' is not a subtype of type 'double' of 'x'.
#0      Point.Point (dart:math/point.dart:13)
#1      main (file:///tmp/test.dart:4:25)

test.dart

import 'dart:math';

void main() {
  Point<double> p = new Point<double>();
}