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11.1.4 Jumps

Other jumps are expressed by either GOTO_EXPR or RETURN_EXPR.

The operand of a GOTO_EXPR must be either a label or a variable containing the address to jump to.

The operand of a RETURN_EXPR is either NULL_TREE, RESULT_DECL, or a MODIFY_EXPR which sets the return value. It would be nice to move the MODIFY_EXPR into a separate statement, but the special return semantics in expand_return make that difficult. It may still happen in the future, perhaps by moving most of that logic into expand_assignment.