Purpose of “let expression” (LetExpr) in the Java compiler?

Generally speaking, why does it exist?

It exists for autoboxing as Google suggests.

If you have code like this:

Integer foo = 0;
foo++;

Java internally makes this into this helper expression:

Integer foo = 0;
let int foo_helper = foo.intValue() in foo_helper++;

Source: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6614974

That expression obviously has no syntax representation, it’s just an AST level transformation to simplify compilation.

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