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The ? Operator Can be used in functions that return Option (not just Result) #2173

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ultrasaurus opened this issue Nov 25, 2019 · 2 comments
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The ? Operator Can be used in functions that return Option (not just Result) #2173

ultrasaurus opened this issue Nov 25, 2019 · 2 comments

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@ultrasaurus
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? can be used for Option or Result since 1.22 (see blog post)

Documentation in the book says "The ? Operator Can Only Be Used in Functions That Return Result" -- see https://doc.rust-lang.org/book/ch09-02-recoverable-errors-with-result.html#recoverable-errors-with-result

the text of this section doesn't match the current capabilities of Rust, or but the displayed error message is correct (maybe the example errors are auto-generated):
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eddyp added a commit to upstreaming/trpl-book that referenced this issue Nov 25, 2019
@eddyp
Add hints on Result-Option conversion (fix: rust-lang#2173)
b02adc0 
Signed-off-by: Eddy Petrișor <eddy.petrisor@gmail.com>
@LeSeulArtichaut
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This has been adressed in #2047, I guess?

@ultrasaurus
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Looks good to me!

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@ultrasaurus @LeSeulArtichaut