Merge #630

630: parse if expression with unary minus or not expression r=philberty a=dkm

From Mark Wielaard : https://gcc.gnu.org/pipermail/gcc-rust/2021-August/000140.html

> An if conditional expression doesn't need brackets, but that means
> that it doesn't accept struct expressions. Those are not easy to
> distinquish from the block that follows. What isn't immediately clear
> from the grammar is that unary conditions like minus '-' or not '!'
> also shouldn't accept struct expressions (when part of an if
> conditional expression) because those also cannot be easily
> distinquished from the block that follows.
> 
> Add a testcase "ifunaryexpr.rs" that shows a couple of contructs that
> should be accepted as if conditional expressions and fix the parser to
> pass the restriction of not accepting struct expressions after a unary
> expression.

Co-authored-by: Mark Wielaard <mark@klomp.org>

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