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private no-mangle lints: only suggest pub if it doesn't already exist - #47479

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Jan 17, 2018
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private no-mangle lints: only suggest pub if it doesn't already exist#47479
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@zackmdaviszackmdavis commented Jan 16, 2018

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Fixes#47383 (function or static can be pub but unreachable because it's in a private module; adding another pub is nonsensical).

r? @estebank

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zackmdavisforce-pushed the and_the_case_of_the_suggested_double-pub branch from 56520b3 to 1f2a1c2CompareJanuary 16, 2018 04:44
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estebank commented Jan 16, 2018

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r=me once the test is fixed.

@kennytmkennytm added the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Jan 16, 2018
@zackmdavis
in which the private no-mangle lints receive a valued lesson in humility
661e033
The incompetent fool who added these suggestions in 38e5a96 apparently
thought it was safe to assume that, because the offending function or
static was unreachable, it would therefore have not have any existing
visibility modifiers, making it safe for us to unconditionally suggest
inserting `pub`. This isn't true.
This resolvesrust-lang#47383.
@zackmdavis
zackmdavisforce-pushed the and_the_case_of_the_suggested_double-pub branch from 1f2a1c2 to 661e033CompareJanuary 16, 2018 08:31
@petrochenkov

petrochenkov commented Jan 16, 2018

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I don't think this is a correct fix.
Until #47384 is changed this lint should be based on reachability as well.
Otherwise you'll get no_mangle items to which you can't link, but no lint is reported.

@kennytmkennytm added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jan 16, 2018
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zackmdavis commented Jan 16, 2018

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@petrochenkov

Until #47384 is changed this lint should be based on reachability as well. Otherwise you'll get no_mangle items to which you can't link, but no lint is reported.

I'm confused: as I understand, the lint is based on reachability (if !cx.access_levels.is_reachable( ...). This PR doesn't change that; this PR just makes it so that the lint warning doesn't additionally have a "try making it pub" suggestion span when there's already a pub. But the lint is still triggered: notice that the two #[no-mangle]pub items added to the UI test result in two more lint warnings appearing in the output.

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estebank commented Jan 17, 2018

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@bors r+ rollup

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bors commented Jan 17, 2018

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📌 Commit 661e033 has been approved by estebank

@petrochenkov

petrochenkov commented Jan 17, 2018

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Ah, I see, only the help note is disabled, then it's ok.

kennytm added a commit to kennytm/rust that referenced this pull request Jan 17, 2018
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Rollup merge ofrust-lang#47479- zackmdavis:and_the_case_of_the_sugg…
73c06bf
…ested_double-pub, r=estebank
private no-mangle lints: only suggest `pub` if it doesn't already exist
Fixesrust-lang#47383 (function or static can be `pub` but unreachable because it's in a private module; adding another `pub` is nonsensical).
r? @estebank
@kennytmkennytm mentioned this pull request Jan 17, 2018
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kennytm added a commit to kennytm/rust that referenced this pull request Jan 17, 2018
@kennytm
Rollup merge ofrust-lang#47479- zackmdavis:and_the_case_of_the_sugg…
b2c5484
…ested_double-pub, r=estebank
private no-mangle lints: only suggest `pub` if it doesn't already exist
Fixesrust-lang#47383 (function or static can be `pub` but unreachable because it's in a private module; adding another `pub` is nonsensical).
r? @estebank
@kennytmkennytm mentioned this pull request Jan 17, 2018
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bors added a commit that referenced this pull request Jan 17, 2018
@bors
Auto merge of#47522- kennytm:rollup, r=kennytm
0f9c784
Rollup of 21 pull requests
- Successful merges: #47302, #47333, #47387, #47404, #47407, #47426, #47427, #47436, #47444, #47456, #47458, #47467, #47479, #47481, #47483, #47487, #47497, #47498, #47505, #47509, #47514
- Failed merges:
@bors
bors merged commit 661e033 into rust-lang:masterJan 17, 2018
@petrochenkovpetrochenkov mentioned this pull request Jan 19, 2018
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@zackmdaviszackmdavis mentioned this pull request Mar 21, 2018
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