library test;
import self as self;
import "dart:core" as core;

static method test1() → dynamic {
  core::Map<core::Null?, core::Null?>* x = <core::Null?, core::Null?>{null: null};
  x.{core::Map::[]=}(3 as{TypeError} core::Null?, "z" as{TypeError} core::Null?);
}
static method main() → dynamic {}