Add support for span context to `derive(Diagnostic)` and use it by estebank · Pull Request #163414 · rust-lang/rust

estebank · 2026-09-27T20:52:04Z

Allow writing

struct Diagnostic {
    #[primary_span]
    #[label("label text")]
    span: Span,
    #[context]
    context: Span,
}

So that the code pointed at by context is shown in the rendered diagnostic without an underline.

Point at enclosing item(s) on unexpected item type:

error: expected type, found constant
  --> $DIR/consts.rs:2:19
   |
LL | pub fn accept(
LL |     _: impl Trait<K: Copy>
   |                   ^------ bounds are not allowed on associated constants
   |                   |
   |                   unexpected constant
   |
note: the associated constant is defined here
  --> $DIR/consts.rs:7:5
   |
LL |     const K: i32;
   |     ^^^^^^^^^^

Show trait/impl for duplicate impl associated items

error[E0201]: duplicate definitions with name `Bar`:
  --> $DIR/associated-item-duplicate-names-3.rs:14:5
   |
LL | trait Foo {
LL |     type Bar;
   |     --------- item in trait
...
LL | impl Foo for Baz {
LL |     type Bar = i16;
   |     --------------- previous definition here
LL |     type Bar = u16;
   |     ^^^^^^^^^^^^^^^ duplicate definition

Point at trait/impl on associated item mismatch

error[E0324]: item `RESOLVED_WRONG` is an associated method, which doesn't match its trait `MyTrait`
  --> $DIR/unresolved-trait-impl-item.rs:12:5
   |
LL | trait MyTrait {
LL |     async fn resolved(&self);
LL |     const RESOLVED_WRONG: u8 = 0;
   |     ----------------------------- item in trait
...
LL | impl MyTrait for i32 {
...
LL |     async fn RESOLVED_WRONG() {}
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ does not match trait

On impl item signature mismatch, point at impl and trait

error: `impl` item signature doesn't match `trait` item signature
  --> $DIR/self-without-lifetime-constraint.rs:46:5
   |
LL | pub trait FromSql: Sized {
LL |     fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self, &Self>;
   |     -------------------------------------------------------------------- expected `fn(ValueRef<'1>) -> Result<(&'2 str, &'1 &'2 str), _>`
...
LL | impl FromSql for &str {
LL |     fn column_result(value: ValueRef<'_>) -> FromSqlResult<&str, &&str> {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ found `fn(ValueRef<'1>) -> Result<(&'1 str, &'1 &'1 str), _>`
   |
   = note: expected signature `fn(ValueRef<'1>) -> Result<(&'2 str, &'1 &'2 str), FromSqlError>`
              found signature `fn(ValueRef<'1>) -> Result<(&'1 str, &'1 &'1 str), FromSqlError>`
help: the lifetime requirements from the `impl` do not correspond to the requirements in the `trait`
  --> $DIR/self-without-lifetime-constraint.rs:42:60
   |
LL |     fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self, &Self>;
   |                                                            ^^^^ consider borrowing this type parameter in the trait

rustbot · 2026-09-27T20:52:08Z

rustc_macros::diagnostics was changed

cc @TaKO8Ki, @JonathanBrouwer

rustbot · 2026-09-27T20:52:10Z

r? @petrochenkov

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rustbot · 2026-09-27T21:37:10Z

HIR ty lowering was modified

cc @fmease

petrochenkov · 2026-09-28T15:47:51Z

It would be easier to understand what's going on here with a link to the previous work like #162874.

petrochenkov · 2026-09-29T11:21:15Z

r=me after squashing the review changes into the main changes.
@rustbot author

rustbot · 2026-09-29T11:21:19Z

Reminder, once the PR becomes ready for a review, use @rustbot ready.

Allow writing ```rust struct Diagnostic { #[primary_span] #[label("label text")] span: Span, #[context] context: Span, } ``` So that the code pointed at by `context` is shown in the rendered diagnostic without an underline.

``` error[E0201]: duplicate definitions with name `Bar`: --> $DIR/associated-item-duplicate-names-3.rs:14:5 | LL | trait Foo { LL | type Bar; | --------- item in trait ... LL | impl Foo for Baz { LL | type Bar = i16; | --------------- previous definition here LL | type Bar = u16; | ^^^^^^^^^^^^^^^ duplicate definition ```

``` error[E0324]: item `RESOLVED_WRONG` is an associated method, which doesn't match its trait `MyTrait` --> $DIR/unresolved-trait-impl-item.rs:12:5 | LL | trait MyTrait { LL | async fn resolved(&self); LL | const RESOLVED_WRONG: u8 = 0; | ----------------------------- item in trait ... LL | impl MyTrait for i32 { ... LL | async fn RESOLVED_WRONG() {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ does not match trait ```

``` error: `impl` item signature doesn't match `trait` item signature --> $DIR/self-without-lifetime-constraint.rs:46:5 | LL | pub trait FromSql: Sized { LL | fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self, &Self>; | -------------------------------------------------------------------- expected `fn(ValueRef<'1>) -> Result<(&'2 str, &'1 &'2 str), _>` ... LL | impl FromSql for &str { LL | fn column_result(value: ValueRef<'_>) -> FromSqlResult<&str, &&str> { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ found `fn(ValueRef<'1>) -> Result<(&'1 str, &'1 &'1 str), _>` | = note: expected signature `fn(ValueRef<'1>) -> Result<(&'2 str, &'1 &'2 str), FromSqlError>` found signature `fn(ValueRef<'1>) -> Result<(&'1 str, &'1 &'1 str), FromSqlError>` help: the lifetime requirements from the `impl` do not correspond to the requirements in the `trait` --> $DIR/self-without-lifetime-constraint.rs:42:60 | LL | fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self, &Self>; | ^^^^ consider borrowing this type parameter in the trait ```

estebank · 2026-09-29T18:46:57Z

@bors r=petrochenkov

rust-bors · 2026-09-29T18:47:00Z

📌 Commit 246eb14 has been approved by petrochenkov

It is now in the queue for this repository.

…, r=petrochenkov Add support for span context to `derive(Diagnostic)` and use it Allow writing ```rust struct Diagnostic { #[primary_span] #[label("label text")] span: Span, #[context] context: Span, } ``` So that the code pointed at by `context` is shown in the rendered diagnostic without an underline. Point at enclosing item(s) on unexpected item type: ``` error: expected type, found constant --> $DIR/consts.rs:2:19 | LL | pub fn accept( LL | _: impl Trait<K: Copy> | ^------ bounds are not allowed on associated constants | | | unexpected constant | note: the associated constant is defined here --> $DIR/consts.rs:7:5 | LL | const K: i32; | ^^^^^^^^^^ ``` Show trait/impl for duplicate impl associated items ``` error[E0201]: duplicate definitions with name `Bar`: --> $DIR/associated-item-duplicate-names-3.rs:14:5 | LL | trait Foo { LL | type Bar; | --------- item in trait ... LL | impl Foo for Baz { LL | type Bar = i16; | --------------- previous definition here LL | type Bar = u16; | ^^^^^^^^^^^^^^^ duplicate definition ``` Point at trait/impl on associated item mismatch ``` error[E0324]: item `RESOLVED_WRONG` is an associated method, which doesn't match its trait `MyTrait` --> $DIR/unresolved-trait-impl-item.rs:12:5 | LL | trait MyTrait { LL | async fn resolved(&self); LL | const RESOLVED_WRONG: u8 = 0; | ----------------------------- item in trait ... LL | impl MyTrait for i32 { ... LL | async fn RESOLVED_WRONG() {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ does not match trait ``` On `impl` item signature mismatch, point at impl and trait ``` error: `impl` item signature doesn't match `trait` item signature --> $DIR/self-without-lifetime-constraint.rs:46:5 | LL | pub trait FromSql: Sized { LL | fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self, &Self>; | -------------------------------------------------------------------- expected `fn(ValueRef<'1>) -> Result<(&'2 str, &'1 &'2 str), _>` ... LL | impl FromSql for &str { LL | fn column_result(value: ValueRef<'_>) -> FromSqlResult<&str, &&str> { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ found `fn(ValueRef<'1>) -> Result<(&'1 str, &'1 &'1 str), _>` | = note: expected signature `fn(ValueRef<'1>) -> Result<(&'2 str, &'1 &'2 str), FromSqlError>` found signature `fn(ValueRef<'1>) -> Result<(&'1 str, &'1 &'1 str), FromSqlError>` help: the lifetime requirements from the `impl` do not correspond to the requirements in the `trait` --> $DIR/self-without-lifetime-constraint.rs:42:60 | LL | fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self, &Self>; | ^^^^ consider borrowing this type parameter in the trait ```

…uwer Rollup of 5 pull requests Successful merges: - #158102 (When compiling without a specified `--edition`, emit a message) - #158936 (Add `std::fs::{Home|Media}Dirs`) - #163414 (Add support for span context to `derive(Diagnostic)` and use it) - #163405 (Remove some #[linkage] options) - #163498 (Revert "Rollup merge of #120589 - devnexen:cpuaff_fbsd_upd, r=clarfonthey")

…, r=petrochenkov Add support for span context to `derive(Diagnostic)` and use it Allow writing ```rust struct Diagnostic { #[primary_span] #[label("label text")] span: Span, #[context] context: Span, } ``` So that the code pointed at by `context` is shown in the rendered diagnostic without an underline. Point at enclosing item(s) on unexpected item type: ``` error: expected type, found constant --> $DIR/consts.rs:2:19 | LL | pub fn accept( LL | _: impl Trait<K: Copy> | ^------ bounds are not allowed on associated constants | | | unexpected constant | note: the associated constant is defined here --> $DIR/consts.rs:7:5 | LL | const K: i32; | ^^^^^^^^^^ ``` Show trait/impl for duplicate impl associated items ``` error[E0201]: duplicate definitions with name `Bar`: --> $DIR/associated-item-duplicate-names-3.rs:14:5 | LL | trait Foo { LL | type Bar; | --------- item in trait ... LL | impl Foo for Baz { LL | type Bar = i16; | --------------- previous definition here LL | type Bar = u16; | ^^^^^^^^^^^^^^^ duplicate definition ``` Point at trait/impl on associated item mismatch ``` error[E0324]: item `RESOLVED_WRONG` is an associated method, which doesn't match its trait `MyTrait` --> $DIR/unresolved-trait-impl-item.rs:12:5 | LL | trait MyTrait { LL | async fn resolved(&self); LL | const RESOLVED_WRONG: u8 = 0; | ----------------------------- item in trait ... LL | impl MyTrait for i32 { ... LL | async fn RESOLVED_WRONG() {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ does not match trait ``` On `impl` item signature mismatch, point at impl and trait ``` error: `impl` item signature doesn't match `trait` item signature --> $DIR/self-without-lifetime-constraint.rs:46:5 | LL | pub trait FromSql: Sized { LL | fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self, &Self>; | -------------------------------------------------------------------- expected `fn(ValueRef<'1>) -> Result<(&'2 str, &'1 &'2 str), _>` ... LL | impl FromSql for &str { LL | fn column_result(value: ValueRef<'_>) -> FromSqlResult<&str, &&str> { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ found `fn(ValueRef<'1>) -> Result<(&'1 str, &'1 &'1 str), _>` | = note: expected signature `fn(ValueRef<'1>) -> Result<(&'2 str, &'1 &'2 str), FromSqlError>` found signature `fn(ValueRef<'1>) -> Result<(&'1 str, &'1 &'1 str), FromSqlError>` help: the lifetime requirements from the `impl` do not correspond to the requirements in the `trait` --> $DIR/self-without-lifetime-constraint.rs:42:60 | LL | fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self, &Self>; | ^^^^ consider borrowing this type parameter in the trait ```

Rollup of 8 pull requests Successful merges: - #158102 (When compiling without a specified `--edition`, emit a message) - #158936 (Add `std::fs::{Home|Media}Dirs`) - #163414 (Add support for span context to `derive(Diagnostic)` and use it) - #163481 (triagebot: use r-l/r zulip linkifier for r-l/r rustfmt backport nominations) - #163502 (arch::breakpoint: update docs) - #163505 (Sync cg_gcc subtree 2026-09-29) - #163405 (Remove some #[linkage] options) - #163498 (Revert "Rollup merge of #120589 - devnexen:cpuaff_fbsd_upd, r=clarfonthey")

…, r=petrochenkov Add support for span context to `derive(Diagnostic)` and use it Allow writing ```rust struct Diagnostic { #[primary_span] #[label("label text")] span: Span, #[context] context: Span, } ``` So that the code pointed at by `context` is shown in the rendered diagnostic without an underline. Point at enclosing item(s) on unexpected item type: ``` error: expected type, found constant --> $DIR/consts.rs:2:19 | LL | pub fn accept( LL | _: impl Trait<K: Copy> | ^------ bounds are not allowed on associated constants | | | unexpected constant | note: the associated constant is defined here --> $DIR/consts.rs:7:5 | LL | const K: i32; | ^^^^^^^^^^ ``` Show trait/impl for duplicate impl associated items ``` error[E0201]: duplicate definitions with name `Bar`: --> $DIR/associated-item-duplicate-names-3.rs:14:5 | LL | trait Foo { LL | type Bar; | --------- item in trait ... LL | impl Foo for Baz { LL | type Bar = i16; | --------------- previous definition here LL | type Bar = u16; | ^^^^^^^^^^^^^^^ duplicate definition ``` Point at trait/impl on associated item mismatch ``` error[E0324]: item `RESOLVED_WRONG` is an associated method, which doesn't match its trait `MyTrait` --> $DIR/unresolved-trait-impl-item.rs:12:5 | LL | trait MyTrait { LL | async fn resolved(&self); LL | const RESOLVED_WRONG: u8 = 0; | ----------------------------- item in trait ... LL | impl MyTrait for i32 { ... LL | async fn RESOLVED_WRONG() {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ does not match trait ``` On `impl` item signature mismatch, point at impl and trait ``` error: `impl` item signature doesn't match `trait` item signature --> $DIR/self-without-lifetime-constraint.rs:46:5 | LL | pub trait FromSql: Sized { LL | fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self, &Self>; | -------------------------------------------------------------------- expected `fn(ValueRef<'1>) -> Result<(&'2 str, &'1 &'2 str), _>` ... LL | impl FromSql for &str { LL | fn column_result(value: ValueRef<'_>) -> FromSqlResult<&str, &&str> { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ found `fn(ValueRef<'1>) -> Result<(&'1 str, &'1 &'1 str), _>` | = note: expected signature `fn(ValueRef<'1>) -> Result<(&'2 str, &'1 &'2 str), FromSqlError>` found signature `fn(ValueRef<'1>) -> Result<(&'1 str, &'1 &'1 str), FromSqlError>` help: the lifetime requirements from the `impl` do not correspond to the requirements in the `trait` --> $DIR/self-without-lifetime-constraint.rs:42:60 | LL | fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self, &Self>; | ^^^^ consider borrowing this type parameter in the trait ```

Rollup of 7 pull requests Successful merges: - #158936 (Add `std::fs::{Home|Media}Dirs`) - #163414 (Add support for span context to `derive(Diagnostic)` and use it) - #163481 (triagebot: use r-l/r zulip linkifier for r-l/r rustfmt backport nominations) - #163502 (arch::breakpoint: update docs) - #163505 (Sync cg_gcc subtree 2026-09-29) - #163405 (Remove some #[linkage] options) - #163498 (Revert "Rollup merge of #120589 - devnexen:cpuaff_fbsd_upd, r=clarfonthey")

Rollup of 6 pull requests Successful merges: - #158936 (Add `std::fs::{Home|Media}Dirs`) - #163414 (Add support for span context to `derive(Diagnostic)` and use it) - #163481 (triagebot: use r-l/r zulip linkifier for r-l/r rustfmt backport nominations) - #163502 (arch::breakpoint: update docs) - #163505 (Sync cg_gcc subtree 2026-09-29) - #163498 (Revert "Rollup merge of #120589 - devnexen:cpuaff_fbsd_upd, r=clarfonthey")

Rollup merge of #163414 - estebank:derive-diagnostic-context, r=petrochenkov Add support for span context to `derive(Diagnostic)` and use it Allow writing ```rust struct Diagnostic { #[primary_span] #[label("label text")] span: Span, #[context] context: Span, } ``` So that the code pointed at by `context` is shown in the rendered diagnostic without an underline. Point at enclosing item(s) on unexpected item type: ``` error: expected type, found constant --> $DIR/consts.rs:2:19 | LL | pub fn accept( LL | _: impl Trait<K: Copy> | ^------ bounds are not allowed on associated constants | | | unexpected constant | note: the associated constant is defined here --> $DIR/consts.rs:7:5 | LL | const K: i32; | ^^^^^^^^^^ ``` Show trait/impl for duplicate impl associated items ``` error[E0201]: duplicate definitions with name `Bar`: --> $DIR/associated-item-duplicate-names-3.rs:14:5 | LL | trait Foo { LL | type Bar; | --------- item in trait ... LL | impl Foo for Baz { LL | type Bar = i16; | --------------- previous definition here LL | type Bar = u16; | ^^^^^^^^^^^^^^^ duplicate definition ``` Point at trait/impl on associated item mismatch ``` error[E0324]: item `RESOLVED_WRONG` is an associated method, which doesn't match its trait `MyTrait` --> $DIR/unresolved-trait-impl-item.rs:12:5 | LL | trait MyTrait { LL | async fn resolved(&self); LL | const RESOLVED_WRONG: u8 = 0; | ----------------------------- item in trait ... LL | impl MyTrait for i32 { ... LL | async fn RESOLVED_WRONG() {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ does not match trait ``` On `impl` item signature mismatch, point at impl and trait ``` error: `impl` item signature doesn't match `trait` item signature --> $DIR/self-without-lifetime-constraint.rs:46:5 | LL | pub trait FromSql: Sized { LL | fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self, &Self>; | -------------------------------------------------------------------- expected `fn(ValueRef<'1>) -> Result<(&'2 str, &'1 &'2 str), _>` ... LL | impl FromSql for &str { LL | fn column_result(value: ValueRef<'_>) -> FromSqlResult<&str, &&str> { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ found `fn(ValueRef<'1>) -> Result<(&'1 str, &'1 &'1 str), _>` | = note: expected signature `fn(ValueRef<'1>) -> Result<(&'2 str, &'1 &'2 str), FromSqlError>` found signature `fn(ValueRef<'1>) -> Result<(&'1 str, &'1 &'1 str), FromSqlError>` help: the lifetime requirements from the `impl` do not correspond to the requirements in the `trait` --> $DIR/self-without-lifetime-constraint.rs:42:60 | LL | fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self, &Self>; | ^^^^ consider borrowing this type parameter in the trait ```

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estebank changed the title ~~Add support for span context to derive(Diagnostic)~~ Add support for span context to derive(Diagnostic) and use it Sep 27, 2026

petrochenkov reviewed Sep 28, 2026

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Comment thread tests/ui/associated-type-bounds/consts.rs Outdated

Comment thread tests/ui/associated-item/associated-item-duplicate-names.stderr

Comment thread compiler/rustc_resolve/src/late.rs

Comment thread compiler/rustc_hir_analysis/src/hir_ty_lowering/errors.rs Outdated

petrochenkov added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Sep 28, 2026

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estebank added 5 commits September 29, 2026 16:36

Add support for span context to derive(Diagnostic)

768500b

Allow writing ```rust struct Diagnostic { #[primary_span] #[label("label text")] span: Span, #[context] context: Span, } ``` So that the code pointed at by `context` is shown in the rendered diagnostic without an underline.

Point at enclosing item(s) on unexpected item type

c5f17f6

estebank force-pushed the derive-diagnostic-context branch from 577968c to 246eb14 Compare September 29, 2026 16:37

rust-bors Bot 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-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Sep 29, 2026

JonathanBrouwer mentioned this pull request Sep 29, 2026

Rollup of 5 pull requests #163504

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tgross35 mentioned this pull request Sep 29, 2026

Rollup of 8 pull requests #163514

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tgross35 mentioned this pull request Sep 30, 2026

Rollup of 7 pull requests #163517

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jhpratt mentioned this pull request Sep 30, 2026

Rollup of 6 pull requests #163522

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rust-bors Bot merged commit c7a9fa3 into rust-lang:main Sep 30, 2026
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Toolchain upgrade to nightly-2026-10-09 flux-rs/flux#1811

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Add support for span context to `derive(Diagnostic)` and use it - #163414

Add support for span context to `derive(Diagnostic)` and use it#163414
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