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Perhaps make orphan rules more permissive of associated types? #20590

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nikomatsakis opened this issue Jan 5, 2015 · 5 comments
Closed

Perhaps make orphan rules more permissive of associated types? #20590

nikomatsakis opened this issue Jan 5, 2015 · 5 comments
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A-associated-items Area: Associated items such as associated types and consts. A-typesystem Area: The type system

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@nikomatsakis
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For now I'm treating associated types just like type parameters in coherence. I've given this approximately zero thought, it just seems like the conservative course, and we can always reverse it. For now it's largely a moot point since associated type references within impls don't work anyhow. Search the code for a FIXME.
@kmcallister kmcallister added A-associated-items Area: Associated items such as associated types and consts. A-typesystem Area: The type system labels Jan 5, 2015
@nikomatsakis nikomatsakis changed the title Straighten out story of associated types and coherence Perhaps make orphan rules more permissive of associated types? Jan 8, 2015
@nikomatsakis
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Updated title to make it clear that this would be an extension and hence is not a particular priority right now, especially absent a convincing use case.

@lambda-fairy
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#20400 looks like a special case of this bug.

@nikomatsakis
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Actually I think #20400 is a separate thing -- that's more about the other half of coherence, the overlap check.

@steveklabnik
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Triage: would this be an RFC now? Post 1.0, a change like this feels pretty big.

@nikomatsakis
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It's probably not as big as it sounds. Still I think we are probably doing the right thing here and afaik being conservative is causing us no problems. I'm just going to close the issue.

@oli-obk oli-obk mentioned this issue Sep 6, 2017
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nivkner added a commit to nivkner/rust that referenced this issue Oct 7, 2017
@nivkner
address more FIXME whose associated issues were marked as closed
e0ac65e 
update FIXME(rust-lang#6298) to point to open issue 15020
update FIXME(rust-lang#6268) to point to RFC 811
update FIXME(rust-lang#10520) to point to RFC 1751
remove FIXME for emscripten issue 4563 and include target in `test_estimate_scaling_factor`
remove FIXME(rust-lang#18207) since node_id isn't used for `ref` pattern analysis
remove FIXME(rust-lang#6308) since DST was implemented in rust-lang#12938
remove FIXME(rust-lang#2658) since it was decided to not reorganize module
remove FIXME(rust-lang#20590) since it was decided to stay conservative with projection types
remove FIXME(rust-lang#20297) since it was decided that solving the issue is unnecessary
remove FIXME(rust-lang#27086) since closures do correspond to structs now
remove FIXME(rust-lang#13846) and enable `function_sections` for windows
remove mention of rust-lang#22079 in FIXME(rust-lang#22079) since this is a general FIXME
remove FIXME(rust-lang#5074) since the restriction on borrow were lifted
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A-associated-items Area: Associated items such as associated types and consts. A-typesystem Area: The type system
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@steveklabnik @nikomatsakis @kmcallister @lambda-fairy