Jorge Aparicio 210dd611aa implement the ? operator ... The `?` postfix operator is sugar equivalent to the try! macro, but is more amenable to chaining: `File::open("foo")?.metadata()?.is_dir()`. `?` is accepted on any *expression* that can return a `Result`, e.g. `x()?`, `y!()?`, `{z}?`, `(w)?`, etc. And binds more tightly than unary operators, e.g. `!x?` is parsed as `!(x?)`. cc #31436		2016-03-07 14:39:39 -05:00
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pp.rs	libsyntax: deny warnings in doctests	2015-11-12 05:16:57 +00:00
pprust.rs	implement the ? operator	2016-03-07 14:39:39 -05:00