libstd: Remove "dual impls" from the language and enforce coherence rule... #4640
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
…ules. "Dual impls" are impls that are both type implementations and trait implementations. They can lead to ambiguity and so this patch removes them from the language. This also enforces coherence rules. Without this patch, records can implement traits not defined in the current crate. This patch fixes this, and updates all of rustc to adhere to the new enforcement. Most of this patch is fixing rustc to obey the coherence rules, which involves converting a bunch of records to structs.
|
r+ |
bors
added a commit
to rust-lang-ci/rust
that referenced
this pull request
May 2, 2020
…=flip1995 New lint: pats_with_wild_match_arm Wildcard use with other pattern in same match arm. The wildcard covers other(s) pattern(s) as it will match anyway. changelog: add new lint when multiple patterns (including wildcard) are used in a match arm. Fixes rust-lang#4640.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
...s.
"Dual impls" are impls that are both type implementations and trait
implementations. They can lead to ambiguity and so this patch removes them
from the language.
This also enforces coherence rules. Without this patch, records can implement
traits not defined in the current crate. This patch fixes this, and updates
all of rustc to adhere to the new enforcement. Most of this patch is fixing
rustc to obey the coherence rules, which involves converting a bunch of records
to structs.
r? @brson