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Fix spurious trait privacy error #31920

Merged
merged 3 commits into from
Mar 6, 2016
Merged

Fix spurious trait privacy error #31920

merged 3 commits into from
Mar 6, 2016

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jseyfried
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This PR allows using methods from traits that are visible but are defined in an inaccessible module (fixes #18241). For example,

mod foo {
    pub use foo::bar::Tr;
    mod bar { // This module is inaccessible from `g`
        pub trait Tr { fn f(&self) {} }
    }
}
fn g<T: foo::Tr>(t: T) {
    t.f(); // Currently, this is a privacy error even though `foo::Tr` is visible
}

After this PR, it will continue to be a privacy error to use a method from a trait that is not visible. This can happen when a public trait inherits from a private trait (in violation of the public_in_private lint) -- see @petrochenkov's example in #28504.
r? @nikomatsakis

@jseyfried
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cc @alexcrichton

jseyfried
jseyfried reviewed Feb 26, 2016
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src/librustc_privacy/lib.rs
Some(ast_map::NodeForeignItem(_)) => {
self.tcx.map.get_foreign_vis(closest_private_id)
}
Some(ast_map::NodeVariant(..)) => {
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This arm was unreachable. Variants are always DefModifiers::PUBLIC in resolve, so the LastPrivate is never a variant.

@petrochenkov
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LGTM

@alexcrichton
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Weird, I thought that loop was at the core of one of the required parts of the privacy check... But hey if the tests pass looks like a great cleanup to me!

@jseyfried jseyfried force-pushed the fix_spurious_privacy_error branch 12 times, most recently from 2b3db8c to 0b06658 Compare March 2, 2016 09:59
@nikomatsakis
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r=me

@jseyfried
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@nikomatsakis According to my measurements, loading the public external modules eagerly slows down the stage1-cfail tests by ~14% and slows down a minimal example with crates rustc, syntax, and typeck by ~7%.

I decided to fix #21670 without slowing anything down in separate PR.

@jseyfried
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@bors: r=nikomatsakis

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bors commented Mar 4, 2016

📌 Commit a84268b has been approved by nikomatsakis

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bors commented Mar 4, 2016

⌛ Testing commit a84268b with merge 59fa34a...

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bors commented Mar 4, 2016

💔 Test failed - auto-linux-64-x-android-t

@jseyfried
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The test failed because of implicit merge conflicts (unused function)

@jseyfried
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@bors r=nikomatsakis

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bors commented Mar 4, 2016

📌 Commit d908ff1 has been approved by nikomatsakis

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bors commented Mar 6, 2016

⌛ Testing commit d908ff1 with merge 45f0ce7...

bors added a commit that referenced this pull request Mar 6, 2016
@bors
Auto merge of #31920 - jseyfried:fix_spurious_privacy_error, r=nikoma…
45f0ce7 
…tsakis

This PR allows using methods from traits that are visible but are defined in an inaccessible module (fixes #18241). For example,
```rust
mod foo {
    pub use foo::bar::Tr;
    mod bar { // This module is inaccessible from `g`
        pub trait Tr { fn f(&self) {} }
    }
}
fn g<T: foo::Tr>(t: T) {
    t.f(); // Currently, this is a privacy error even though `foo::Tr` is visible
}
```

After this PR, it will continue to be a privacy error to use a method from a trait that is not visible. This can happen when a public trait inherits from a private trait (in violation of the `public_in_private` lint) -- see @petrochenkov's example in #28504.
r? @nikomatsakis
@bors
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bors commented Mar 6, 2016

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-x-android-t, auto-linux-cross-opt, auto-linux-musl-64-opt, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-mac-ios-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-opt, auto-win-msvc-64-opt

@bors bors merged commit d908ff1 into rust-lang:master Mar 6, 2016
@jseyfried jseyfried mentioned this pull request Mar 9, 2016
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@jseyfried jseyfried deleted the fix_spurious_privacy_error branch March 25, 2016 22:56
This was referenced May 1, 2016
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Trait re-exports fail due to privacy of containing module
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@jseyfried @petrochenkov @alexcrichton @nikomatsakis @bors