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This commit fixes the issue #50452.
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When inserting a node N into the tree of impls, we sometimes find than
an existing node C should be replaced with N. We used to overwrite C
in place with the new def-id N -- but since the lists of def-ids are
separated by simplified type, that could lead to N being inserted in
the wrong place. This meant we might miss conflicts. We are now not
trying to be so smart -- we remove C and then add N later.
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not skipping any wfchecks on default impls
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a default impl should never be considered as implementing the
trait on its own -- regardless of whether it contains all items
or not
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a `default impl` need not include all items from the trait
a `default impl` alone does not mean that a type implements the trait
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Properly parse impls for the never type `!`
Recover from missing `for` in `impl Trait for Type`
Prohibit inherent default impls and default impls of auto traits
Change wording in more diagnostics to use "auto traits"
Some minor code cleanups in the parser
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We also rename some of the files to conform to the
feature-gate-<feat_name>.rs pattern that is most common.
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DefaultImpl is a highly confusing name for what we now call auto impls,
as in `impl Send for ..`. The name auto impl is not formally decided
but for sanity anything is better than `DefaultImpl` which refers
neither to `default impl` nor to `impl Default`.
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pr review
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this commit implements the first step of the `default impl` feature:
all items in a `default impl` are (implicitly) `default` and hence
specializable.
In order to test this feature I've copied all the tests provided for the
`default` method implementation (in run-pass/specialization and
compile-fail/specialization directories) and moved the `default` keyword
from the item to the impl.
See referenced issue for further info
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This patch allows overlap to occur between any two impls of a trait for
traits which have no associated items.
Several compile-fail tests around coherence had to be changed to add at
least one item to the trait they test against.
Ref #29864
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Now, no feature outside of the whitelist is
without a test marked as its gate test.
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This commit rewrites all of the tidy checks we have, namely:
* featureck
* errorck
* tidy
* binaries
into Rust under a new `tidy` tool inside of the `src/tools` directory. This at
the same time deletes all the corresponding Python tidy checks so we can be sure
to only have one source of truth for all the tidy checks.
cc #31590
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