library;
import self as self;
import "dart:core" as core;
import "dart:collection" as col;

static method nullAwareListSpread(core::List<core::String*>* list) → dynamic {
  list = block {
    final core::List<core::String*>* #t1 = <core::String*>[];
    #t1.{core::List::add}("foo");
    final core::Iterable<core::String*>* #t2 = list;
    if(!#t2.{core::Object::==}(null))
      for (final core::String* #t3 in #t2)
        #t1.{core::List::add}(#t3);
  } =>#t1;
}
static method nullAwareSetSpread(core::Set<core::String*>* set) → dynamic {
  set = block {
    final core::Set<core::String*>* #t4 = col::LinkedHashSet::•<core::String*>();
    #t4.{core::Set::add}("foo");
    final core::Iterable<core::String*>* #t5 = set;
    if(!#t5.{core::Object::==}(null))
      for (final core::String* #t6 in #t5)
        #t4.{core::Set::add}(#t6);
  } =>#t4;
}
static method nullAwareMapSpread(core::Map<core::int*, core::String*>* map) → dynamic {
  map = block {
    final core::Map<core::int*, core::String*>* #t7 = <core::int*, core::String*>{};
    #t7.{core::Map::[]=}(0, "foo");
    final core::Map<core::int*, core::String*>* #t8 = map;
    if(!#t8.{core::Object::==}(null))
      for (final core::MapEntry<core::int*, core::String*>* #t9 in #t8.{core::Map::entries})
        #t7.{core::Map::[]=}(#t9.{core::MapEntry::key}, #t9.{core::MapEntry::value});
  } =>#t7;
}
static method main() → dynamic {
  self::nullAwareListSpread(null);
  self::nullAwareSetSpread(null);
  self::nullAwareMapSpread(null);
}