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expose needs_drop under mem #41892

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Merged
merged 3 commits into from
May 21, 2017
Merged

expose needs_drop under mem #41892

merged 3 commits into from
May 21, 2017

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Gankra
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@Gankra Gankra commented May 10, 2017

Note that I purposefully didn't update the intrinsic's documentation, because I think it makes sense for it be more... "honest" about its semantics.

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r? @brson

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@TimNN TimNN added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label May 10, 2017
@nagisa nagisa mentioned this pull request May 11, 2017
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Gankra commented May 11, 2017

Fixed the whitespace errors (had auto-whitespace-trimming disabled since Swift people got mad when you fixed that).

The unstable book error thing is uh, new to me.

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aturon commented May 12, 2017

cc @rust-lang/libs @rust-lang/lang

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👍

eddyb
eddyb reviewed May 12, 2017
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src/libcore/mem.rs
///
/// This is purely an optimization hint, and may be implemented conservatively.
/// For instance, always returning `true` would be a valid implementation of
/// this function.
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So there's some backstory here: basically this was never implemented in the compiler in a principled way, to account for associated types. I've made the Copy check recursive recently but I don't believe that's relevant here.
What's left is to normalize associated type projections in the recursion and/or make an auto trait and rely on the trait system to handle the structural recursion involved here. cc @nikomatsakis

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@gnzlbg gnzlbg Sep 13, 2019 •
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@eddyb Is this a bug in the current implementation, and if so, is there an issue tracking it? If not, could you maybe expand on why needs_drop cannot be accurate?

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bors commented May 13, 2017

☔ The latest upstream changes (presumably #41847) made this pull request unmergeable. Please resolve the merge conflicts.

@Mark-Simulacrum Mark-Simulacrum added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels May 14, 2017
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ping @gankro looks like this needs a rebase? Looks like there's not a whole lot of opinions here, and we don't have a huge amount of ceremony about unstable apis, so I can r+ when you've rebased

@Mark-Simulacrum Mark-Simulacrum added T-lang Relevant to the language team T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. labels May 20, 2017
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@aturon You nominated but didn't label with any teams, I've added both that you pinged (T-lang and T-libs).

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Gankra commented May 20, 2017

Rebased.

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@bors r=alexcrichton

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bors commented May 20, 2017

📌 Commit 1f01b09 has been approved by alexcrichton

Mark-Simulacrum added a commit to Mark-Simulacrum/rust that referenced this pull request May 20, 2017
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Rollup merge of rust-lang#41892 - Gankro:needs_drop, r=alexcrichton
c37d66a 
expose needs_drop under mem

Note that I purposefully didn't update the intrinsic's documentation, because I think it makes sense for it be more... "honest" about its semantics.
@Mark-Simulacrum Mark-Simulacrum mentioned this pull request May 20, 2017
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bors added a commit that referenced this pull request May 21, 2017
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Auto merge of #42130 - Mark-Simulacrum:rollup, r=Mark-Simulacrum
7ac844f 
Rollup of 6 pull requests

- Successful merges: #41892, #42062, #42091, #42093, #42098, #42127
- Failed merges:
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bors commented May 21, 2017

⌛ Testing commit 1f01b09 with merge 7ac844f...

@bors bors merged commit 1f01b09 into rust-lang:master May 21, 2017
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