Type inference of dartanalyzer is weak ?

console1.txt

[mizushima]$ dartanalyzer generics.dart 
Analyzing generics.dart...
  error • Missing parameter type for 'x' at generics.dart:13:37 • strong_mode_implicit_dynamic_parameter
1 error found.

generics.dart

List<T> filter<T>(List<T> original, bool pred(T arg)) {                         
  List<T> newList = []; 
  for(var e in original) {
    if(pred(e)) {
      newList.add(e);
    }   
  }
  return newList;
}

void main() {
  var xs = filter<int>([1, 2, 3, 4, 5], (x) => x % 2 != 0);
  var ys = filter([1, 2, 3, 4, 5], (x) => x % 2 != 0);
  print(xs);
  print(ys);
}