generalize impl trait to permit multiple lifetime bounds#61775

Merged

bors merged 68 commits intorust-lang:masterfrom nikomatsakis:issue-56238-multiple-lifetimes-async-fn-region-solver

Jul 3, 2019

Commits on Jul 2, 2019

opaque_types/mod.rs: rustfmt
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introduce constrain_regions helper
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introduce an "in" constraint instead of error
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lexical_region_resolve: rustfmt
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make dup_vec optional
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add some tests, currently ICE-ing
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rename from "in constraint" to "pick constraint"
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integrate pick constraints into lexical solver more completely
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enforce and report pick-constraint errors
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rename QueryRegionConstraint to QueryOutlivesConstraint
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introduce QueryRegionConstraints struct (no-op)
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introduce QueryRegionConstraints struct
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rename ConstraintIndex to OutlivesConstraintIndex
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remove deref impl and add an index impl
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pass a &mut QueryRegionConstraints not just outlives constraints
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propagate the pick-constraints through queries
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rename ConstraintSet to OutlivesConstraintSet
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[WIP] fix Lift impl for Rc
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pass more than outlives constraints to constraint conversion
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implement PickConstraintSet type
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construct pick-constraints and give them to region inference
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preliminary integration of "pick constraints" into nll solver
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remove old error and add an explanation
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improve tests with migration mode, mir mode
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implement the graph traits for SCC
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introduce a VecGraph abstraction that cheaply stores graphs
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add a depth_first_search helper function
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integrate reverse graph and upper-bound computation
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fix tests and remove outdated stderr files
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update the async-fn-multiple-lifetimes test
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add a FIXME related to the non-free-region case
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explain why pick-constraints can be an empty vector
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remove outdated TODO markers
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pacify the mercilous tidy
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add a preliminary existential test; not really enough
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test with explicit existential type
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add a VecMap data structure
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just create a binary search slice helper fn
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account for the pick-constraint edges when reporting errors
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address nits by mattewjasper
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bless test output
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fix silly bugs in binary_search_util test
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switch to Lrc
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implement Lift for Arc
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rename to "member constraints"
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rename pick_constraints.rs to member_constraints.rs
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implement TypeFoldable for Arc
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feature-gate member constraints outside of async-await
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Update src/doc/unstable-book/src/language-features/member-constraints.md

nikomatsakis
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Centril
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Update src/librustc/infer/lexical_region_resolve/mod.rs

nikomatsakis
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Centril
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explain why the code is the way it is
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various centril nits
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rewrite dup_vec to use IndexVec instead of u32
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cleanup formatting of comment and add attribution
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opaque_types: various nits
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s/abstract_type_generics/opaque_type_generics/
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opaque_types: more nits
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region_constraints: nits
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more centril nits
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pass a parameter to enable impl Trait instead of a vec
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more nits + typos
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introduce more tests covering async fn surface
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Update src/test/ui/async-await/multiple-lifetimes/ret-impl-trait-one.rs

nikomatsakis
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matthewjasper
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Update src/test/ui/async-await/multiple-lifetimes/fn-ptr.rs

nikomatsakis
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matthewjasper
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Update src/test/ui/async-await/multiple-lifetimes/elided.rs

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matthewjasper
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Update src/test/ui/async-await/multiple-lifetimes/ret-impl-trait-no-fg.rs

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matthewjasper
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address nits
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fix ICE with delay-span-bug
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