Test exercising cyclic structure in std::collections#27185
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bors merged 1 commit intorust-lang:masterfrom Jul 22, 2015
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Test exercising cyclic structure in std::collections#27185bors merged 1 commit intorust-lang:masterfrom
std::collections#27185bors merged 1 commit intorust-lang:masterfrom
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…ions` (as much as is possible; e.g. things like `EnumSet` and `BitVec` do not really support carrying references at all, so trying to represent cyclic structure within them dooes not really make sense.)
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In particular `LinkedList` and `RawTable` (the backing representation for `HashMap` and `HashSet`). This is to get the test from PR rust-lang#27185 building.
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Note that VecMap is slated for deprecation
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And also it's literally just a Vec so I can't imagine any possible interesting analysis here.
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This test attempts to exercise cyclic structure in much of `std::collections` (as much as is possible; e.g. things like `EnumSet` and `BitVec` do not really support carrying references at all, so trying to represent cyclic structure within them dooes not really make sense.) This work should land before we make future revisions to `dropck`; that is, I am attempting to catch potential regressions to cases where we supported cyclic structure circa Rust 1.2.
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I needed it in `RawVec`, `Vec`, and `TypedArena` for `rustc` to bootstrap; but of course that alone was not sufficient for `make check`. Later I added `unsafe_destructor_blind_to_params` to collections, in particular `LinkedList` and `RawTable` (the backing representation for `HashMap` and `HashSet`), to get the regression tests exercising cyclic structure from PR rust-lang#27185 building. ---- Note that the feature is `dropck_parametricity` (which is not the same as the attribute's name). We will almost certainly vary our strategy here in the future, so it makes some sense to have a not-as-ugly name for the feature gate. (The attribute name was deliberately selected to be ugly looking.)
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Major revision to the dropck_legal_cycles test. 1. Added big comment block explaining the test framework. 2. Added tests exericising Rc and Arc. This was inspired by a comment from eefriedman on PR #28861. 3. Made the cycle-detection not issue false-positives on acyclic dags. Doing this efficiently required revising the framework; instead of visiting all children (i.e. doing a traversal), now each test is responsible for supplying the path that will act as a witness to the cycle. Luckily for me, all of the pre-existing tests worked with a trivial path built from "always tke your first left", but new tests I added did require other input paths (i.e., "first turn right, then left". (The path representation is a bit-string and its branches are n-ary, not word phrases and binary branches as you might think from the outline above.) cc PR #27185
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I needed it in `RawVec`, `Vec`, and `TypedArena` for `rustc` to bootstrap; but of course that alone was not sufficient for `make check`. Later I added `unsafe_destructor_blind_to_params` to collections, in particular `LinkedList` and `RawTable` (the backing representation for `HashMap` and `HashSet`), to get the regression tests exercising cyclic structure from PR rust-lang#27185 building. ---- Note that the feature is `dropck_parametricity` (which is not the same as the attribute's name). We will almost certainly vary our strategy here in the future, so it makes some sense to have a not-as-ugly name for the feature gate. (The attribute name was deliberately selected to be ugly looking.)
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This test attempts to exercise cyclic structure in much of
std::collections(as much as is possible; e.g. things like
EnumSetandBitVecdo not really support carrying references at all, so trying to represent cyclic structure within them dooes not really make sense.)This work should land before we make future revisions to
dropck; that is, I am attempting to catch potential regressions to cases where we supported cyclic structure circa Rust 1.2.