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Provide structured suggestion for impl Default of type where all fields have defaults #134979

Merged
merged 1 commit into from
Jan 1, 2025
Merged

Provide structured suggestion for impl Default of type where all fields have defaults #134979

merged 1 commit into from
Jan 1, 2025

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estebank
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error: `Default` impl doesn't use the declared default field values
  --> $DIR/manual-default-impl-could-be-derived.rs:28:1
   |
LL | / impl Default for B {
LL | |     fn default() -> Self {
LL | |         B {
LL | |             x: s(),
   | |                --- this field has a default value
LL | |             y: 0,
   | |                - this field has a default value
...  |
LL | | }
   | |_^
   |
help: to avoid divergence in behavior between `Struct { .. }` and `<Struct as Default>::default()`, derive the `Default`
   |
LL ~ #[derive(Default)] struct B {
   |

Note that above the structured suggestion also includes completely removing the manual impl, but the rendering doesn't.

@estebank
Provide structured suggestion for impl Default of type where all fi…
2b2ea9e 
…elds have defaults

```
error: `Default` impl doesn't use the declared default field values
  --> $DIR/manual-default-impl-could-be-derived.rs:28:1
   |
LL | / impl Default for B {
LL | |     fn default() -> Self {
LL | |         B {
LL | |             x: s(),
   | |                --- this field has a default value
LL | |             y: 0,
   | |                - this field has a default value
...  |
LL | | }
   | |_^
   |
help: to avoid divergence in behavior between `Struct { .. }` and `<Struct as Default>::default()`, derive the `Default`
   |
LL ~ #[derive(Default)] struct B {
   |
```

Note that above the structured suggestion also includes completely removing the manual `impl`, but the rendering doesn't.
@estebank estebank added the F-default_field_values `#![feature(default_field_values)]` label Dec 31, 2024
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rustbot commented Dec 31, 2024

r? @jieyouxu

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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 Dec 31, 2024
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@bors r+ rollup

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bors commented Dec 31, 2024

📌 Commit 2b2ea9e has been approved by compiler-errors

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 Dec 31, 2024
Zalathar added a commit to Zalathar/rust that referenced this pull request Jan 1, 2025
@Zalathar
Rollup merge of rust-lang#134979 - estebank:default-lint-sugg, r=comp…
e349ce4 
…iler-errors

Provide structured suggestion for `impl Default` of type where all fields have defaults

```
error: `Default` impl doesn't use the declared default field values
  --> $DIR/manual-default-impl-could-be-derived.rs:28:1
   |
LL | / impl Default for B {
LL | |     fn default() -> Self {
LL | |         B {
LL | |             x: s(),
   | |                --- this field has a default value
LL | |             y: 0,
   | |                - this field has a default value
...  |
LL | | }
   | |_^
   |
help: to avoid divergence in behavior between `Struct { .. }` and `<Struct as Default>::default()`, derive the `Default`
   |
LL ~ #[derive(Default)] struct B {
   |
```

Note that above the structured suggestion also includes completely removing the manual `impl`, but the rendering doesn't.
@Zalathar Zalathar mentioned this pull request Jan 1, 2025
Closed
bors added a commit to rust-lang-ci/rust that referenced this pull request Jan 1, 2025
@bors
Auto merge of rust-lang#134991 - Zalathar:rollup-lo5eya3, r=Zalathar
3d15f38 
Rollup of 7 pull requests

Successful merges:

 - rust-lang#131439 (Remove allowing static_mut_refs lint)
 - rust-lang#133292 (E0277: suggest dereferencing function arguments in more cases)
 - rust-lang#134080 (Avoid use of LFS64 symbols on Emscripten)
 - rust-lang#134877 (add suggestion for wrongly ordered format parameters)
 - rust-lang#134926 (Update books)
 - rust-lang#134945 (Some small nits to the borrowck suggestions for mutating a map through index)
 - rust-lang#134979 (Provide structured suggestion for `impl Default` of type where all fields have defaults)

r? `@ghost`
`@rustbot` modify labels: rollup
@Zalathar Zalathar mentioned this pull request Jan 1, 2025
Merged
bors added a commit to rust-lang-ci/rust that referenced this pull request Jan 1, 2025
@bors
Auto merge of rust-lang#134992 - Zalathar:rollup-pldy5w6, r=Zalathar
bc3e301 
Rollup of 6 pull requests

Successful merges:

 - rust-lang#131439 (Remove allowing static_mut_refs lint)
 - rust-lang#133292 (E0277: suggest dereferencing function arguments in more cases)
 - rust-lang#134877 (add suggestion for wrongly ordered format parameters)
 - rust-lang#134945 (Some small nits to the borrowck suggestions for mutating a map through index)
 - rust-lang#134950 (bootstrap: Overhaul and simplify the `tool_check_step!` macro)
 - rust-lang#134979 (Provide structured suggestion for `impl Default` of type where all fields have defaults)

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 65cb7c6 into rust-lang:master Jan 1, 2025
6 checks passed
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Jan 1, 2025
@rust-timer
Unrolled build for rust-lang#134979
3b10631 
Rollup merge of rust-lang#134979 - estebank:default-lint-sugg, r=compiler-errors

Provide structured suggestion for `impl Default` of type where all fields have defaults

```
error: `Default` impl doesn't use the declared default field values
  --> $DIR/manual-default-impl-could-be-derived.rs:28:1
   |
LL | / impl Default for B {
LL | |     fn default() -> Self {
LL | |         B {
LL | |             x: s(),
   | |                --- this field has a default value
LL | |             y: 0,
   | |                - this field has a default value
...  |
LL | | }
   | |_^
   |
help: to avoid divergence in behavior between `Struct { .. }` and `<Struct as Default>::default()`, derive the `Default`
   |
LL ~ #[derive(Default)] struct B {
   |
```

Note that above the structured suggestion also includes completely removing the manual `impl`, but the rendering doesn't.
@rustbot rustbot added this to the 1.85.0 milestone Jan 1, 2025
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F-default_field_values `#![feature(default_field_values)]` S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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@estebank @rustbot @compiler-errors @bors @jieyouxu