weird-exprs: if if if if
The `if` keyword can be chained as long as there are enough `{...} else {...}` following, and they all return a `bool` (not required for the last one).
`if` expression can be also put inside a `match` arm guard, thus making the whole thing a little bit more confusing.
Discovered this clusterfunk while reading the reference because I have nothing better to do.
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