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implement the ? operator #31954

Merged
merged 2 commits into from Mar 8, 2016
Merged

implement the ? operator #31954

merged 2 commits into from Mar 8, 2016

Commits on Mar 7, 2016

  1. 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 rust-lang#31436
    Jorge Aparicio committed Mar 7, 2016
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Commits on Mar 8, 2016

  1. update error messages in parse-fail tests

    Jorge Aparicio committed Mar 8, 2016
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    2de4932 View commit details
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