Because of retrolambda, we can use java 8 lambda feature in java 5 6 7. so, How to make Intellij Idea allow lambda in java 5 6 7 language level, also with ide features for lambda ?, we can use java 8 lambd
阅读背景：
让Intellij IDEA允许在java 5 6 7语言水平上使用IDE支持。
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