library /*isNonNullableByDefault*/;
import self as self;
import "dart:core" as core;

static method main() → dynamic {
  core::bool b = false;
  block {
    final core::List<core::String> #t1 = <core::String>["ab"];
    if(b)
      #t1.{core::List::add}{Invariant}("cd"){(core::String) → void};
  } =>#t1;
}