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Make the return type of Fn trait an associated type #21019

Merged
merged 14 commits into from
Jan 28, 2015
Merged

Make the return type of Fn trait an associated type #21019

merged 14 commits into from
Jan 28, 2015

Commits on Jan 28, 2015

  1. Change list of predicates in ParameterEnvironment to a Vec.

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  2. Add the notion of normalizing a parameter environment and ensure that 

    all parameter environments are normalized. Correspondingly, stop
normalizing predicates we extract out of the environment. Fixes rust-lang#21664.
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  3. Move return type an associated type of the Fn* traits. Mostly this … 

    …involves tweaking things in

the compiler that assumed two input types to assume two ouputs; we also have to teach `project.rs`
to project `Output` from the unboxed closure and fn traits.
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  4. Fix a latent bug in trait dispatch where we sometimes counted associa… 

    …ted types

when constructing the vtable-index. Not good.
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  5. When pretty-printing object types, include the output associated type

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  6. Add Clone to the list of bounds for a TypeFolder. (Kill?)

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  7. Extract expectations from the projection obligation, which includes 

    all relevant information.
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  8. Patch variance bug: appearing in a binding is an invariant position (… 

    …at least right now).
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  9. Update Rustdoc to deal with the Fn return type being an associated type.

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  10. Update test files; mostly the problem is that they were using the 

    explicit form `Fn<A,B>` and now should use `Fn(A) -> B` or
`Fn<A,Output=B>`, but in some cases we get duplicate error
reports. This is mildly annoying and arises because of the main error
and another error from the projection. Might be worth squashing those,
but seems like a separate problem.
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  11. Add missing space to error message.

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    nikomatsakis committed Jan 28, 2015
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  12. Adjust comment per nrc's suggestion.

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  13. Add new test for object method numbering mismatches.

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  14. Add regression test for rust-lang#21212. Fixes rust-lang#21212.

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