__auto_type is a useful gnu extension, very useful for writing safe macros.
Its advantage over typeof:
1. instead of typeof(expr) _x = (expr), now __auto_type _x = (expr). `expr' now
only appears once, avoid potension exponential expansion.
2. when writing __auto_type x = y; `x' is put in scope only after the
semicolon, no danger of name collision.
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