什么时候产生合成价值?它们是用来做什么的?它们在哪个编译器阶段被擦除?在制作 scala 编译器插件时,我不断遇到关于合成值的错误。这是错误:
error: scala.reflect.internal.FatalError: symbol value x$3#33790 does not exist in scala.collection.immutable.Stream.scala$collection$immutable$Stream$$advance$1, which contains locals value newvalue#39255,value newvalue #39254,剩余价值#33601,价值存根1#33600,价值存根0#33599。
Method code: def advance(stub0: List[A], stub1: List[A], rest: Stream[A]): Stream[A] = if (rest.isEmpty())
Stream.empty()
else
{
if (stub0.isEmpty())
{
val newvalue: scala#27.collection#2835.immutable#5932.Stream#8383 = Stream.this.scala$collection$immutable$Stream$$advance$1(stub1.reverse(), Nil, rest);
newvalue
}
else
{
val newvalue: collection#2835.immutable#5932.Stream$Cons#11078 = scala.collection.immutable.Stream$cons.apply(stub0.head(), {
((new <$anon: Function0#2069>(Stream.this, stub0, stub1, rest, x$3)): Function0#2069)
});
newvalue
}
}