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Implement arbitrary_self_types#45870

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Nov 12, 2017

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Commits on Nov 7, 2017

• add tests for the arbitrary_self_types, which won't pass yet

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• initial implementation of arbitrary_self_types

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• Rewrote check_method_receiver and ExplicitSelf, got a borrow checker error

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• Fix the lifetime error in ExplicitSelf

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• Improve feature gate error, and return after emitting errors instead of looping forever

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• Fix some of the tests

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• get the old error messages back

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• Add arbitrary_self_types feature gate error to some tests

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• Update/improve documentation of ExpliciSelf

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• wrap error code in DiagnosticId::Error so it compiles

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Commits on Nov 8, 2017

• modify ExplicitSelf::determine to take an `is_self_type` predicate closure, instead of infcx

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• move ExplicitSelf to rustc::ty::util, and use it to implement object safety checks

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• normalize associated types in both self_ty and self_arg_ty

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• Switch from using At::eq to InferCtxt::can_eq and demand_eqtype_with_origin

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• add a NOTE comment to the object safety test so that it passes

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• Remove the error check that I think is redundant, and change the test error messages that I don't understand why they changed, so the tests pass

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• tidy things up a bit

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• shorten line length for tidy

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• fix error message in arbitrary-self-types-not-object-safe test

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• update ui test to new error message

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Commits on Nov 9, 2017

• fix the bug in region_inference where constraint origins were being overwritten

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• fixed all the compile-fail error messages

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• update test/ui/static-lifetime.stderr with new error message

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• add a comment explaining the bugfix to infer::region_inference::add_constraint

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• Don't emit the feature error if it's an invalid self type

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• add run-pass tests

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