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On E0308 involving dyn Trait, mention trait objects #120315

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merged 2 commits into from
Jan 25, 2024

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@estebank estebank commented Jan 24, 2024

When encountering a type mismatch error involving dyn Trait, mention the existence of boxed trait objects if the other type involved implements Trait.

Fix #102629.

When encountering a type mismatch error involving `dyn Trait`, mention
the existence of boxed trait objects if the other type involved
implements `Trait`.

Partially addresses rust-lang#102629.
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rustbot commented Jan 24, 2024

r? @wesleywiser

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@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jan 24, 2024
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Nice! I can definitely see this and #120261 helping point new users in the right direction if they haven't really seen boxing before.

@bors r+ rollup

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bors commented Jan 24, 2024

📌 Commit 796814d has been approved by wesleywiser

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jan 24, 2024
bors added a commit to rust-lang-ci/rust that referenced this pull request Jan 25, 2024
…iaskrgr

Rollup of 10 pull requests

Successful merges:

 - rust-lang#119305 (Add `AsyncFn` family of traits)
 - rust-lang#119389 (Provide more context on recursive `impl` evaluation overflow)
 - rust-lang#119895 (Remove `track_errors` entirely)
 - rust-lang#120230 (Assert that a single scope is passed to `for_scope`)
 - rust-lang#120278 (Remove --fatal-warnings on wasm targets)
 - rust-lang#120292 (coverage: Dismantle `Instrumentor` and flatten span refinement)
 - rust-lang#120315 (On E0308 involving `dyn Trait`, mention trait objects)
 - rust-lang#120317 (pattern_analysis: Let `ctor_sub_tys` return any Iterator they want)
 - rust-lang#120318 (pattern_analysis: Reuse most of the `DeconstructedPat` `Debug` impl)
 - rust-lang#120325 (rustc_data_structures: use either instead of itertools)

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 0cbef47 into rust-lang:master Jan 25, 2024
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@rustbot rustbot added this to the 1.77.0 milestone Jan 25, 2024
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Jan 25, 2024
Rollup merge of rust-lang#120315 - estebank:issue-102629-2, r=wesleywiser

On E0308 involving `dyn Trait`, mention trait objects

When encountering a type mismatch error involving `dyn Trait`, mention the existence of boxed trait objects if the other type involved implements `Trait`.

Fix rust-lang#102629.
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On E0308, detect incorrect attempts to use trait objects
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