/guava/guava/src/com/google/common/util/concurrent/ExecutionList.java
this.runnable = null;
this.runnable = runnable;
private static final class RunnableExecutorPair { final Runnable runnable; final Executor executor; @CheckForNull RunnableExecutorPair next; RunnableExecutorPair( Runnable runnable, Executor executor, @CheckForNull RunnableExecutorPair next) { <extra_id_0> this.executor = executor; this.next = next; } } }