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filter lifetimes in impl Trait #44725

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nikomatsakis opened this issue Sep 20, 2017 · 4 comments
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filter lifetimes in impl Trait #44725

nikomatsakis opened this issue Sep 20, 2017 · 4 comments
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C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC E-mentor Call for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. WG-traits Working group: Traits, https://internals.rust-lang.org/t/announcing-traits-working-group/6804

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@nikomatsakis
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nikomatsakis commented Sep 20, 2017 •
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currently, impl Trait usages capture all lifetimes that are in scope (and this kind of fails around late-bound lifetimes). In the newer RFC, the proposal was that they should only capture those lifetimes that are used in the impl trait itself.

Here are some mentoring instructions I wrote-up from before on how one might do this. But another way to think about this might be to think about implementing abstract type (perhaps in a limited form) and desugaring to that.

However, work on this issue is blocked on #44727.
@nikomatsakis nikomatsakis added E-needs-mentor T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. WG-traits Working group: Traits, https://internals.rust-lang.org/t/announcing-traits-working-group/6804 labels Sep 20, 2017
@aturon aturon mentioned this issue Sep 20, 2017
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@TimNN TimNN added the C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC label Sep 20, 2017
@nikomatsakis
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See also: #44727

@nikomatsakis nikomatsakis added E-mentor Call for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion. and removed E-needs-mentor labels Sep 21, 2017
@ErichDonGubler
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This issue is now ready to be worked on, right? :)

@Yoric
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Yoric commented Dec 1, 2017

Since #44727 is closed, I'm interested in working on this. @nikomatsakis a few pointers on which files I'm supposed to dig into would be helpful, though.

@nikomatsakis
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Er, sorry, this is done actually. =)

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C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC E-mentor Call for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. WG-traits Working group: Traits, https://internals.rust-lang.org/t/announcing-traits-working-group/6804
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