library /*isNonNullableByDefault*/;
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::_GrowableList::_literal1<core::String>("foo");
    final core::Iterable<core::String>? #t2 = list;
    if(!(#t2 == null))
      #t1.{core::List::addAll}{Invariant}(#t2{core::Iterable<core::String>}){(core::Iterable<core::String>) → void};
  } =>#t1;
}
static method nullAwareSetSpread(core::Set<core::String>? set) → dynamic {
  set = block {
    final core::Set<core::String> #t3 = new col::_CompactLinkedHashSet::•<core::String>();
    #t3.{core::Set::add}{Invariant}("foo"){(core::String) → core::bool};
    final core::Iterable<core::String>? #t4 = set;
    if(!(#t4 == null))
      #t3.{core::Set::addAll}{Invariant}(#t4{core::Iterable<core::String>}){(core::Iterable<core::String>) → void};
  } =>#t3;
}
static method nullAwareMapSpread(core::Map<core::int, core::String>? map) → dynamic {
  map = block {
    final core::Map<core::int, core::String> #t5 = <core::int, core::String>{};
    #t5.{core::Map::[]=}{Invariant}(0, "foo"){(core::int, core::String) → void};
    final core::Map<core::int, core::String>? #t6 = map;
    if(!(#t6 == null)) {
      core::Iterator<core::MapEntry<core::int, core::String>> :sync-for-iterator = #t6{core::Map<core::int, core::String>}.{core::Map::entries}{core::Iterable<core::MapEntry<core::int, core::String>>}.{core::Iterable::iterator}{core::Iterator<core::MapEntry<core::int, core::String>>};
      for (; :sync-for-iterator.{core::Iterator::moveNext}(){() → core::bool}; ) {
        final core::MapEntry<core::int, core::String> #t7 = :sync-for-iterator.{core::Iterator::current}{core::MapEntry<core::int, core::String>};
        #t5.{core::Map::[]=}{Invariant}(#t7.{core::MapEntry::key}{core::int}, #t7.{core::MapEntry::value}{core::String}){(core::int, core::String) → void};
      }
    }
  } =>#t5;
}
static method main() → dynamic {
  self::nullAwareListSpread(null);
  self::nullAwareSetSpread(null);
  self::nullAwareMapSpread(null);
}