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Lint: warn when mixing #[repr(C)] with Drop #24935

Merged
merged 2 commits into from
Apr 30, 2015
Merged

Lint: warn when mixing #[repr(C)] with Drop #24935

merged 2 commits into from
Apr 30, 2015

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pnkfelix
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Lint: warn when mixing #[repr(C)] with Drop

Fix #24585

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r? @alexcrichton

(rust_highfive has picked a reviewer for you, use r? to override)

huonw
huonw reviewed Apr 29, 2015
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src/librustc_lint/builtin.rs
codemap::DUMMY_SP);
ctx.span_lint(DROP_WITH_REPR_EXTERN,
drop_impl_span,
"Structs with `#[repr(C)]` attribute that \
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I believe we generally start compiler messages with a lower case.

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I wonder if this message could also be rephrased slightly, maybe:

implementing Drop adds hidden state to a struct, possibly conflicting with the #[repr(C)] attribute

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I didn't like the fact that I was referring solely to "structs" anyway, when this is slightly more general than that. So, that's fixed now. :)

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Just a few minor nits, otherwise r=me though. Thanks @pnkfelix!

@pnkfelix
lint for mixing #[repr(C)] with an impl of Drop.
78130a4
@pnkfelix
tests for lint that warns about mixing #[repr(C)] with Drop.
2e23d81 
THis includes tests for struct and enum. (I suspect the closure case
is actually unreachable, but i see no harm in including it.)
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@bors r=alexcrichton 2e23d81 rollup

alexcrichton added a commit to alexcrichton/rust that referenced this pull request Apr 29, 2015
@alexcrichton
rollup merge of rust-lang#24935: pnkfelix/lint-repr-c-drop
373d620 
Lint: warn when mixing `#[repr(C)]` with Drop

Fix rust-lang#24585
@bors bors merged commit 2e23d81 into rust-lang:master Apr 30, 2015
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triage: beta-nominated

@rust-highfive rust-highfive added the beta-nominated Nominated for backporting to the compiler in the beta channel. label Apr 30, 2015
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accepted for backport to beta channel.

(this is special case for 1.0; post 1.0 a change like this might need stronger motivation...)

@pnkfelix pnkfelix added the beta-accepted Accepted for backporting to the compiler in the beta channel. label Apr 30, 2015
@alexcrichton alexcrichton mentioned this pull request Apr 30, 2015
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@brson brson removed the beta-nominated Nominated for backporting to the compiler in the beta channel. label Apr 30, 2015
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brson commented Apr 30, 2015

Backported.

@alexcrichton alexcrichton mentioned this pull request May 1, 2015
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The Drop flag is a footgun for #[repr(C)]
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@pnkfelix @rust-highfive @alexcrichton @brson @huonw @bors