diff --git a/compiler/rustc_macros/src/diagnostics/subdiagnostic.rs b/compiler/rustc_macros/src/diagnostics/subdiagnostic.rs
index 2f42a3b0bd4..62d49c1c64e 100644
--- a/compiler/rustc_macros/src/diagnostics/subdiagnostic.rs
+++ b/compiler/rustc_macros/src/diagnostics/subdiagnostic.rs
@@ -422,6 +422,7 @@ impl<'parent, 'a> SubdiagnosticDeriveVariantBuilder<'parent, 'a> {
                 list.parse_nested_meta(|nested| {
                     if nested.path.is_ident("code") {
                         let code_field = new_code_ident();
+                        let span = nested.path.span().unwrap();
                         let formatting_init = build_suggestion_code(
                             &code_field,
                             nested,
diff --git a/compiler/rustc_macros/src/diagnostics/utils.rs b/compiler/rustc_macros/src/diagnostics/utils.rs
index bc104941c38..838347ecb61 100644
--- a/compiler/rustc_macros/src/diagnostics/utils.rs
+++ b/compiler/rustc_macros/src/diagnostics/utils.rs
@@ -727,7 +727,7 @@ impl SubdiagnosticKind {
                         fields,
                         AllowMultipleAlternatives::Yes,
                     );
-                    code.set_once(code_init, span);
+                    code.set_once(code_init, path_span);
                 }
                 (
                     "applicability",
diff --git a/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.stderr b/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.stderr
index 041ebdee0ab..cd14c7496b3 100644
--- a/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.stderr
+++ b/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.stderr
@@ -435,16 +435,16 @@ LL | | struct LintAttributeOnLintDiag {}
    = help: specify the slug as the first argument to the attribute, such as `#[diag(compiletest_example)]`
 
 error: specified multiple times
-  --> $DIR/diagnostic-derive.rs:608:5
+  --> $DIR/diagnostic-derive.rs:608:53
    |
 LL |     #[suggestion(no_crate_suggestion, code = "...", code = ",,,")]
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |                                                     ^^^^
    |
 note: previously specified here
-  --> $DIR/diagnostic-derive.rs:608:5
+  --> $DIR/diagnostic-derive.rs:608:39
    |
 LL |     #[suggestion(no_crate_suggestion, code = "...", code = ",,,")]
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |                                       ^^^^
 
 error: wrong types for suggestion
   --> $DIR/diagnostic-derive.rs:617:24
diff --git a/tests/ui-fulldeps/session-diagnostic/subdiagnostic-derive.rs b/tests/ui-fulldeps/session-diagnostic/subdiagnostic-derive.rs
index c882f7792d5..1d928ca93f9 100644
--- a/tests/ui-fulldeps/session-diagnostic/subdiagnostic-derive.rs
+++ b/tests/ui-fulldeps/session-diagnostic/subdiagnostic-derive.rs
@@ -82,7 +82,7 @@ struct F {
 
 #[derive(Subdiagnostic)]
 #[label(bug = "...")]
-//~^ ERROR `#[label(bug = ...)]` is not a valid attribute
+//~^ ERROR invalid nested attribute
 //~| ERROR diagnostic slug must be first argument
 struct G {
     #[primary_span]
@@ -92,8 +92,7 @@ struct G {
 
 #[derive(Subdiagnostic)]
 #[label("...")]
-//~^ ERROR `#[label("...")]` is not a valid attribute
-//~| ERROR diagnostic slug must be first argument
+//~^ ERROR unexpected literal in nested attribute, expected ident
 struct H {
     #[primary_span]
     span: Span,
@@ -102,7 +101,7 @@ struct H {
 
 #[derive(Subdiagnostic)]
 #[label(slug = 4)]
-//~^ ERROR `#[label(slug = ...)]` is not a valid attribute
+//~^ ERROR invalid nested attribute
 //~| ERROR diagnostic slug must be first argument
 struct J {
     #[primary_span]
@@ -112,7 +111,7 @@ struct J {
 
 #[derive(Subdiagnostic)]
 #[label(slug("..."))]
-//~^ ERROR `#[label(slug(...))]` is not a valid attribute
+//~^ ERROR invalid nested attribute
 //~| ERROR diagnostic slug must be first argument
 struct K {
     #[primary_span]
@@ -132,7 +131,7 @@ struct L {
 
 #[derive(Subdiagnostic)]
 #[label()]
-//~^ ERROR diagnostic slug must be first argument of a `#[label(...)]` attribute
+//~^ ERROR unexpected end of input, unexpected token in nested attribute, expected ident
 struct M {
     #[primary_span]
     span: Span,
@@ -141,7 +140,7 @@ struct M {
 
 #[derive(Subdiagnostic)]
 #[label(no_crate_example, code = "...")]
-//~^ ERROR `#[label(code = ...)]` is not a valid attribute
+//~^ ERROR invalid nested attribute
 struct N {
     #[primary_span]
     span: Span,
@@ -150,7 +149,7 @@ struct N {
 
 #[derive(Subdiagnostic)]
 #[label(no_crate_example, applicability = "machine-applicable")]
-//~^ ERROR `#[label(applicability = ...)]` is not a valid attribute
+//~^ ERROR invalid nested attribute
 struct O {
     #[primary_span]
     span: Span,
@@ -222,7 +221,7 @@ enum T {
 enum U {
     #[label(code = "...")]
     //~^ ERROR diagnostic slug must be first argument of a `#[label(...)]` attribute
-    //~| ERROR `#[label(code = ...)]` is not a valid attribute
+    //~| ERROR invalid nested attribute
     A {
         #[primary_span]
         span: Span,
@@ -323,7 +322,7 @@ struct AD {
 
 #[derive(Subdiagnostic)]
 #[label(no_crate_example, no_crate::example)]
-//~^ ERROR `#[label(no_crate::example)]` is not a valid attribute
+//~^ ERROR a diagnostic slug must be the first argument to the attribute
 struct AE {
     #[primary_span]
     span: Span,
@@ -537,7 +536,7 @@ struct BA {
 #[derive(Subdiagnostic)]
 #[multipart_suggestion(no_crate_example, code = "...", applicability = "machine-applicable")]
 //~^ ERROR multipart suggestion without any `#[suggestion_part(...)]` fields
-//~| ERROR `#[multipart_suggestion(code = ...)]` is not a valid attribute
+//~| ERROR invalid nested attribute
 struct BBa {
     var: String,
 }
@@ -554,7 +553,7 @@ struct BBb {
 #[multipart_suggestion(no_crate_example, applicability = "machine-applicable")]
 struct BBc {
     #[suggestion_part()]
-    //~^ ERROR `#[suggestion_part(...)]` attribute without `code = "..."`
+    //~^ ERROR unexpected end of input, unexpected token in nested attribute, expected ident
     span1: Span,
 }
 
@@ -574,10 +573,11 @@ struct BD {
     //~^ ERROR `#[suggestion_part(...)]` attribute without `code = "..."`
     span1: Span,
     #[suggestion_part()]
-    //~^ ERROR `#[suggestion_part(...)]` attribute without `code = "..."`
+    //~^ ERROR unexpected end of input, unexpected token in nested attribute, expected ident
     span2: Span,
     #[suggestion_part(foo = "bar")]
-    //~^ ERROR `#[suggestion_part(foo = ...)]` is not a valid attribute
+    //~^ ERROR `code` is the only valid nested attribute
+    //~| ERROR expected `,`
     span4: Span,
     #[suggestion_part(code = "...")]
     //~^ ERROR the `#[suggestion_part(...)]` attribute can only be applied to fields of type `Span` or `MultiSpan`
@@ -669,6 +669,7 @@ enum BL {
 struct BM {
     #[suggestion_part(code("foo"))]
     //~^ ERROR expected exactly one string literal for `code = ...`
+    //~| ERROR unexpected token
     span: Span,
     r#type: String,
 }
@@ -678,6 +679,7 @@ struct BM {
 struct BN {
     #[suggestion_part(code("foo", "bar"))]
     //~^ ERROR expected exactly one string literal for `code = ...`
+    //~| ERROR unexpected token
     span: Span,
     r#type: String,
 }
@@ -687,6 +689,7 @@ struct BN {
 struct BO {
     #[suggestion_part(code(3))]
     //~^ ERROR expected exactly one string literal for `code = ...`
+    //~| ERROR unexpected token
     span: Span,
     r#type: String,
 }
@@ -701,10 +704,13 @@ struct BP {
 }
 
 #[derive(Subdiagnostic)]
+//~^ ERROR cannot find value `__code_29` in this scope
+//~| NOTE in this expansion
+//~| NOTE not found in this scope
 #[multipart_suggestion(no_crate_example)]
 struct BQ {
     #[suggestion_part(code = 3)]
-    //~^ ERROR `code = "..."`/`code(...)` must contain only string literals
+    //~^ ERROR expected string literal
     span: Span,
     r#type: String,
 }
@@ -779,7 +785,7 @@ struct SuggestionStyleInvalid1 {
 
 #[derive(Subdiagnostic)]
 #[suggestion(no_crate_example, code = "", style = 42)]
-//~^ ERROR `#[suggestion(style = ...)]` is not a valid attribute
+//~^ ERROR expected `= "xxx"`
 struct SuggestionStyleInvalid2 {
     #[primary_span]
     sub: Span,
@@ -787,7 +793,7 @@ struct SuggestionStyleInvalid2 {
 
 #[derive(Subdiagnostic)]
 #[suggestion(no_crate_example, code = "", style)]
-//~^ ERROR `#[suggestion(style)]` is not a valid attribute
+//~^ ERROR a diagnostic slug must be the first argument to the attribute
 struct SuggestionStyleInvalid3 {
     #[primary_span]
     sub: Span,
@@ -795,7 +801,8 @@ struct SuggestionStyleInvalid3 {
 
 #[derive(Subdiagnostic)]
 #[suggestion(no_crate_example, code = "", style("foo"))]
-//~^ ERROR `#[suggestion(style(...))]` is not a valid attribute
+//~^ ERROR expected `= "xxx"`
+//~| ERROr expected `,`
 struct SuggestionStyleInvalid4 {
     #[primary_span]
     sub: Span,
diff --git a/tests/ui-fulldeps/session-diagnostic/subdiagnostic-derive.stderr b/tests/ui-fulldeps/session-diagnostic/subdiagnostic-derive.stderr
index d8bf0ba413c..4211b91f04a 100644
--- a/tests/ui-fulldeps/session-diagnostic/subdiagnostic-derive.stderr
+++ b/tests/ui-fulldeps/session-diagnostic/subdiagnostic-derive.stderr
@@ -45,97 +45,97 @@ LL | #[label("...")]
    |         ^^^^^
 
 error: invalid nested attribute
-  --> $DIR/subdiagnostic-derive.rs:104:9
+  --> $DIR/subdiagnostic-derive.rs:103:9
    |
 LL | #[label(slug = 4)]
    |         ^^^^
 
 error: diagnostic slug must be first argument of a `#[label(...)]` attribute
-  --> $DIR/subdiagnostic-derive.rs:104:1
+  --> $DIR/subdiagnostic-derive.rs:103:1
    |
 LL | #[label(slug = 4)]
    | ^^^^^^^^^^^^^^^^^^
 
 error: invalid nested attribute
-  --> $DIR/subdiagnostic-derive.rs:114:9
+  --> $DIR/subdiagnostic-derive.rs:113:9
    |
 LL | #[label(slug("..."))]
    |         ^^^^
 
 error: diagnostic slug must be first argument of a `#[label(...)]` attribute
-  --> $DIR/subdiagnostic-derive.rs:114:1
+  --> $DIR/subdiagnostic-derive.rs:113:1
    |
 LL | #[label(slug("..."))]
    | ^^^^^^^^^^^^^^^^^^^^^
 
 error: unexpected end of input, unexpected token in nested attribute, expected ident
-  --> $DIR/subdiagnostic-derive.rs:134:9
+  --> $DIR/subdiagnostic-derive.rs:133:9
    |
 LL | #[label()]
    |         ^
 
 error: invalid nested attribute
-  --> $DIR/subdiagnostic-derive.rs:143:27
+  --> $DIR/subdiagnostic-derive.rs:142:27
    |
 LL | #[label(no_crate_example, code = "...")]
    |                           ^^^^
 
 error: invalid nested attribute
-  --> $DIR/subdiagnostic-derive.rs:152:27
+  --> $DIR/subdiagnostic-derive.rs:151:27
    |
 LL | #[label(no_crate_example, applicability = "machine-applicable")]
    |                           ^^^^^^^^^^^^^
 
 error: unsupported type attribute for subdiagnostic enum
-  --> $DIR/subdiagnostic-derive.rs:161:1
+  --> $DIR/subdiagnostic-derive.rs:160:1
    |
 LL | #[foo]
    | ^^^^^^
 
 error: `#[bar]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:175:5
+  --> $DIR/subdiagnostic-derive.rs:174:5
    |
 LL |     #[bar]
    |     ^^^^^^
 
 error: `#[bar = ...]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:187:5
+  --> $DIR/subdiagnostic-derive.rs:186:5
    |
 LL |     #[bar = "..."]
    |     ^^^^^^^^^^^^^^
 
 error: `#[bar = ...]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:199:5
+  --> $DIR/subdiagnostic-derive.rs:198:5
    |
 LL |     #[bar = 4]
    |     ^^^^^^^^^^
 
 error: `#[bar(...)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:211:5
+  --> $DIR/subdiagnostic-derive.rs:210:5
    |
 LL |     #[bar("...")]
    |     ^^^^^^^^^^^^^
 
 error: invalid nested attribute
-  --> $DIR/subdiagnostic-derive.rs:223:13
+  --> $DIR/subdiagnostic-derive.rs:222:13
    |
 LL |     #[label(code = "...")]
    |             ^^^^
 
 error: diagnostic slug must be first argument of a `#[label(...)]` attribute
-  --> $DIR/subdiagnostic-derive.rs:223:5
+  --> $DIR/subdiagnostic-derive.rs:222:5
    |
 LL |     #[label(code = "...")]
    |     ^^^^^^^^^^^^^^^^^^^^^^
 
 error: the `#[primary_span]` attribute can only be applied to fields of type `Span` or `MultiSpan`
-  --> $DIR/subdiagnostic-derive.rs:252:5
+  --> $DIR/subdiagnostic-derive.rs:251:5
    |
 LL |     #[primary_span]
    |     ^^^^^^^^^^^^^^^
 
 error: label without `#[primary_span]` field
-  --> $DIR/subdiagnostic-derive.rs:249:1
+  --> $DIR/subdiagnostic-derive.rs:248:1
    |
 LL | / #[label(no_crate_example)]
 LL | |
@@ -147,13 +147,13 @@ LL | | }
    | |_^
 
 error: `#[applicability]` is only valid on suggestions
-  --> $DIR/subdiagnostic-derive.rs:262:5
+  --> $DIR/subdiagnostic-derive.rs:261:5
    |
 LL |     #[applicability]
    |     ^^^^^^^^^^^^^^^^
 
 error: `#[bar]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:272:5
+  --> $DIR/subdiagnostic-derive.rs:271:5
    |
 LL |     #[bar]
    |     ^^^^^^
@@ -161,13 +161,13 @@ LL |     #[bar]
    = help: only `primary_span`, `applicability` and `skip_arg` are valid field attributes
 
 error: `#[bar = ...]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:283:5
+  --> $DIR/subdiagnostic-derive.rs:282:5
    |
 LL |     #[bar = "..."]
    |     ^^^^^^^^^^^^^^
 
 error: `#[bar(...)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:294:5
+  --> $DIR/subdiagnostic-derive.rs:293:5
    |
 LL |     #[bar("...")]
    |     ^^^^^^^^^^^^^
@@ -175,7 +175,7 @@ LL |     #[bar("...")]
    = help: only `primary_span`, `applicability` and `skip_arg` are valid field attributes
 
 error: unexpected unsupported untagged union
-  --> $DIR/subdiagnostic-derive.rs:310:1
+  --> $DIR/subdiagnostic-derive.rs:309:1
    |
 LL | / union AC {
 LL | |
@@ -185,73 +185,73 @@ LL | | }
    | |_^
 
 error: a diagnostic slug must be the first argument to the attribute
-  --> $DIR/subdiagnostic-derive.rs:325:44
+  --> $DIR/subdiagnostic-derive.rs:324:44
    |
 LL | #[label(no_crate_example, no_crate::example)]
    |                                            ^
 
 error: specified multiple times
-  --> $DIR/subdiagnostic-derive.rs:338:5
+  --> $DIR/subdiagnostic-derive.rs:337:5
    |
 LL |     #[primary_span]
    |     ^^^^^^^^^^^^^^^
    |
 note: previously specified here
-  --> $DIR/subdiagnostic-derive.rs:335:5
+  --> $DIR/subdiagnostic-derive.rs:334:5
    |
 LL |     #[primary_span]
    |     ^^^^^^^^^^^^^^^
 
 error: subdiagnostic kind not specified
-  --> $DIR/subdiagnostic-derive.rs:344:8
+  --> $DIR/subdiagnostic-derive.rs:343:8
    |
 LL | struct AG {
    |        ^^
 
 error: specified multiple times
-  --> $DIR/subdiagnostic-derive.rs:381:1
+  --> $DIR/subdiagnostic-derive.rs:380:46
    |
 LL | #[suggestion(no_crate_example, code = "...", code = "...")]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |                                              ^^^^
    |
 note: previously specified here
-  --> $DIR/subdiagnostic-derive.rs:381:1
+  --> $DIR/subdiagnostic-derive.rs:380:32
    |
 LL | #[suggestion(no_crate_example, code = "...", code = "...")]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |                                ^^^^
 
 error: specified multiple times
-  --> $DIR/subdiagnostic-derive.rs:399:5
+  --> $DIR/subdiagnostic-derive.rs:398:5
    |
 LL |     #[applicability]
    |     ^^^^^^^^^^^^^^^^
    |
 note: previously specified here
-  --> $DIR/subdiagnostic-derive.rs:396:5
+  --> $DIR/subdiagnostic-derive.rs:395:5
    |
 LL |     #[applicability]
    |     ^^^^^^^^^^^^^^^^
 
 error: the `#[applicability]` attribute can only be applied to fields of type `Applicability`
-  --> $DIR/subdiagnostic-derive.rs:409:5
+  --> $DIR/subdiagnostic-derive.rs:408:5
    |
 LL |     #[applicability]
    |     ^^^^^^^^^^^^^^^^
 
 error: suggestion without `code = "..."`
-  --> $DIR/subdiagnostic-derive.rs:422:1
+  --> $DIR/subdiagnostic-derive.rs:421:1
    |
 LL | #[suggestion(no_crate_example)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: invalid applicability
-  --> $DIR/subdiagnostic-derive.rs:432:62
+  --> $DIR/subdiagnostic-derive.rs:431:62
    |
 LL | #[suggestion(no_crate_example, code = "...", applicability = "foo")]
    |                                                              ^^^^^
 
 error: suggestion without `#[primary_span]` field
-  --> $DIR/subdiagnostic-derive.rs:450:1
+  --> $DIR/subdiagnostic-derive.rs:449:1
    |
 LL | / #[suggestion(no_crate_example, code = "...")]
 LL | |
@@ -261,25 +261,25 @@ LL | | }
    | |_^
 
 error: unsupported type attribute for subdiagnostic enum
-  --> $DIR/subdiagnostic-derive.rs:464:1
+  --> $DIR/subdiagnostic-derive.rs:463:1
    |
 LL | #[label]
    | ^^^^^^^^
 
 error: `var` doesn't refer to a field on this type
-  --> $DIR/subdiagnostic-derive.rs:484:39
+  --> $DIR/subdiagnostic-derive.rs:483:39
    |
 LL | #[suggestion(no_crate_example, code = "{var}", applicability = "machine-applicable")]
    |                                       ^^^^^^^
 
 error: `var` doesn't refer to a field on this type
-  --> $DIR/subdiagnostic-derive.rs:503:43
+  --> $DIR/subdiagnostic-derive.rs:502:43
    |
 LL |     #[suggestion(no_crate_example, code = "{var}", applicability = "machine-applicable")]
    |                                           ^^^^^^^
 
 error: `#[suggestion_part]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:526:5
+  --> $DIR/subdiagnostic-derive.rs:525:5
    |
 LL |     #[suggestion_part]
    |     ^^^^^^^^^^^^^^^^^^
@@ -287,7 +287,7 @@ LL |     #[suggestion_part]
    = help: `#[suggestion_part(...)]` is only valid in multipart suggestions, use `#[primary_span]` instead
 
 error: `#[suggestion_part(...)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:529:5
+  --> $DIR/subdiagnostic-derive.rs:528:5
    |
 LL |     #[suggestion_part(code = "...")]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -295,7 +295,7 @@ LL |     #[suggestion_part(code = "...")]
    = help: `#[suggestion_part(...)]` is only valid in multipart suggestions
 
 error: suggestion without `#[primary_span]` field
-  --> $DIR/subdiagnostic-derive.rs:523:1
+  --> $DIR/subdiagnostic-derive.rs:522:1
    |
 LL | / #[suggestion(no_crate_example, code = "...")]
 LL | |
@@ -307,7 +307,7 @@ LL | | }
    | |_^
 
 error: invalid nested attribute
-  --> $DIR/subdiagnostic-derive.rs:538:42
+  --> $DIR/subdiagnostic-derive.rs:537:42
    |
 LL | #[multipart_suggestion(no_crate_example, code = "...", applicability = "machine-applicable")]
    |                                          ^^^^
@@ -315,7 +315,7 @@ LL | #[multipart_suggestion(no_crate_example, code = "...", applicability = "mac
    = help: only `style` and `applicability` are valid nested attributes
 
 error: multipart suggestion without any `#[suggestion_part(...)]` fields
-  --> $DIR/subdiagnostic-derive.rs:538:1
+  --> $DIR/subdiagnostic-derive.rs:537:1
    |
 LL | / #[multipart_suggestion(no_crate_example, code = "...", applicability = "machine-applicable")]
 LL | |
@@ -326,19 +326,19 @@ LL | | }
    | |_^
 
 error: `#[suggestion_part(...)]` attribute without `code = "..."`
-  --> $DIR/subdiagnostic-derive.rs:548:5
+  --> $DIR/subdiagnostic-derive.rs:547:5
    |
 LL |     #[suggestion_part]
    |     ^^^^^^^^^^^^^^^^^^
 
 error: unexpected end of input, unexpected token in nested attribute, expected ident
-  --> $DIR/subdiagnostic-derive.rs:556:23
+  --> $DIR/subdiagnostic-derive.rs:555:23
    |
 LL |     #[suggestion_part()]
    |                       ^
 
 error: `#[primary_span]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:565:5
+  --> $DIR/subdiagnostic-derive.rs:564:5
    |
 LL |     #[primary_span]
    |     ^^^^^^^^^^^^^^^
@@ -346,7 +346,7 @@ LL |     #[primary_span]
    = help: multipart suggestions use one or more `#[suggestion_part]`s rather than one `#[primary_span]`
 
 error: multipart suggestion without any `#[suggestion_part(...)]` fields
-  --> $DIR/subdiagnostic-derive.rs:562:1
+  --> $DIR/subdiagnostic-derive.rs:561:1
    |
 LL | / #[multipart_suggestion(no_crate_example)]
 LL | |
@@ -358,13 +358,13 @@ LL | | }
    | |_^
 
 error: `#[suggestion_part(...)]` attribute without `code = "..."`
-  --> $DIR/subdiagnostic-derive.rs:573:5
+  --> $DIR/subdiagnostic-derive.rs:572:5
    |
 LL |     #[suggestion_part]
    |     ^^^^^^^^^^^^^^^^^^
 
 error: `code` is the only valid nested attribute
-  --> $DIR/subdiagnostic-derive.rs:579:23
+  --> $DIR/subdiagnostic-derive.rs:578:23
    |
 LL |     #[suggestion_part(foo = "bar")]
    |                       ^^^
@@ -382,28 +382,28 @@ LL |     #[suggestion_part()]
    |     ^^^^^^^^^^^^^^^^^^^^
 
 error: unexpected end of input, unexpected token in nested attribute, expected ident
-  --> $DIR/subdiagnostic-derive.rs:576:23
+  --> $DIR/subdiagnostic-derive.rs:575:23
    |
 LL |     #[suggestion_part()]
    |                       ^
 
 error: expected `,`
-  --> $DIR/subdiagnostic-derive.rs:579:27
+  --> $DIR/subdiagnostic-derive.rs:578:27
    |
 LL |     #[suggestion_part(foo = "bar")]
    |                           ^
 
 error: specified multiple times
-  --> $DIR/subdiagnostic-derive.rs:593:5
+  --> $DIR/subdiagnostic-derive.rs:593:37
    |
 LL |     #[suggestion_part(code = "...", code = ",,,")]
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |                                     ^^^^
    |
 note: previously specified here
-  --> $DIR/subdiagnostic-derive.rs:593:5
+  --> $DIR/subdiagnostic-derive.rs:593:23
    |
 LL |     #[suggestion_part(code = "...", code = ",,,")]
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |                       ^^^^
 
 error: `#[applicability]` has no effect if all `#[suggestion]`/`#[multipart_suggestion]` attributes have a static `applicability = "..."`
   --> $DIR/subdiagnostic-derive.rs:622:5
@@ -424,55 +424,55 @@ LL |     #[suggestion_part(code("foo"))]
    |                            ^^^^^
 
 error: expected exactly one string literal for `code = ...`
-  --> $DIR/subdiagnostic-derive.rs:679:41
+  --> $DIR/subdiagnostic-derive.rs:680:41
    |
 LL |     #[suggestion_part(code("foo", "bar"))]
    |                                         ^
 
 error: unexpected token
-  --> $DIR/subdiagnostic-derive.rs:679:28
+  --> $DIR/subdiagnostic-derive.rs:680:28
    |
 LL |     #[suggestion_part(code("foo", "bar"))]
    |                            ^^^^^
 
 error: expected exactly one string literal for `code = ...`
-  --> $DIR/subdiagnostic-derive.rs:688:30
+  --> $DIR/subdiagnostic-derive.rs:690:30
    |
 LL |     #[suggestion_part(code(3))]
    |                              ^
 
 error: unexpected token
-  --> $DIR/subdiagnostic-derive.rs:688:28
+  --> $DIR/subdiagnostic-derive.rs:690:28
    |
 LL |     #[suggestion_part(code(3))]
    |                            ^
 
 error: expected exactly one string literal for `code = ...`
-  --> $DIR/subdiagnostic-derive.rs:697:29
+  --> $DIR/subdiagnostic-derive.rs:700:29
    |
 LL |     #[suggestion_part(code())]
    |                             ^
 
 error: expected string literal
-  --> $DIR/subdiagnostic-derive.rs:706:30
+  --> $DIR/subdiagnostic-derive.rs:712:30
    |
 LL |     #[suggestion_part(code = 3)]
    |                              ^
 
 error: specified multiple times
-  --> $DIR/subdiagnostic-derive.rs:748:1
+  --> $DIR/subdiagnostic-derive.rs:754:1
    |
 LL | #[suggestion(no_crate_example, code = "", style = "hidden", style = "normal")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
 note: previously specified here
-  --> $DIR/subdiagnostic-derive.rs:748:1
+  --> $DIR/subdiagnostic-derive.rs:754:1
    |
 LL | #[suggestion(no_crate_example, code = "", style = "hidden", style = "normal")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: `#[suggestion_hidden(...)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:757:1
+  --> $DIR/subdiagnostic-derive.rs:763:1
    |
 LL | #[suggestion_hidden(no_crate_example, code = "")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -480,7 +480,7 @@ LL | #[suggestion_hidden(no_crate_example, code = "")]
    = help: Use `#[suggestion(..., style = "hidden")]` instead
 
 error: `#[suggestion_hidden(...)]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:765:1
+  --> $DIR/subdiagnostic-derive.rs:771:1
    |
 LL | #[suggestion_hidden(no_crate_example, code = "", style = "normal")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -488,7 +488,7 @@ LL | #[suggestion_hidden(no_crate_example, code = "", style = "normal")]
    = help: Use `#[suggestion(..., style = "hidden")]` instead
 
 error: invalid suggestion style
-  --> $DIR/subdiagnostic-derive.rs:773:51
+  --> $DIR/subdiagnostic-derive.rs:779:51
    |
 LL | #[suggestion(no_crate_example, code = "", style = "foo")]
    |                                                   ^^^^^
@@ -496,31 +496,31 @@ LL | #[suggestion(no_crate_example, code = "", style = "foo")]
    = help: valid styles are `normal`, `short`, `hidden`, `verbose` and `tool-only`
 
 error: expected `= "xxx"`
-  --> $DIR/subdiagnostic-derive.rs:781:49
+  --> $DIR/subdiagnostic-derive.rs:787:49
    |
 LL | #[suggestion(no_crate_example, code = "", style = 42)]
    |                                                 ^
 
 error: a diagnostic slug must be the first argument to the attribute
-  --> $DIR/subdiagnostic-derive.rs:789:48
+  --> $DIR/subdiagnostic-derive.rs:795:48
    |
 LL | #[suggestion(no_crate_example, code = "", style)]
    |                                                ^
 
 error: expected `= "xxx"`
-  --> $DIR/subdiagnostic-derive.rs:797:48
+  --> $DIR/subdiagnostic-derive.rs:803:48
    |
 LL | #[suggestion(no_crate_example, code = "", style("foo"))]
    |                                                ^
 
 error: expected `,`
-  --> $DIR/subdiagnostic-derive.rs:797:48
+  --> $DIR/subdiagnostic-derive.rs:803:48
    |
 LL | #[suggestion(no_crate_example, code = "", style("foo"))]
    |                                                ^
 
 error: `#[primary_span]` is not a valid attribute
-  --> $DIR/subdiagnostic-derive.rs:808:5
+  --> $DIR/subdiagnostic-derive.rs:815:5
    |
 LL |     #[primary_span]
    |     ^^^^^^^^^^^^^^^
@@ -529,7 +529,7 @@ LL |     #[primary_span]
    = help: to create a suggestion with multiple spans, use `#[multipart_suggestion]` instead
 
 error: suggestion without `#[primary_span]` field
-  --> $DIR/subdiagnostic-derive.rs:805:1
+  --> $DIR/subdiagnostic-derive.rs:812:1
    |
 LL | / #[suggestion(no_crate_example, code = "")]
 LL | |
@@ -547,61 +547,61 @@ LL | #[foo]
    |   ^^^
 
 error: cannot find attribute `foo` in this scope
-  --> $DIR/subdiagnostic-derive.rs:161:3
+  --> $DIR/subdiagnostic-derive.rs:160:3
    |
 LL | #[foo]
    |   ^^^
 
 error: cannot find attribute `bar` in this scope
-  --> $DIR/subdiagnostic-derive.rs:175:7
+  --> $DIR/subdiagnostic-derive.rs:174:7
    |
 LL |     #[bar]
    |       ^^^
 
 error: cannot find attribute `bar` in this scope
-  --> $DIR/subdiagnostic-derive.rs:187:7
+  --> $DIR/subdiagnostic-derive.rs:186:7
    |
 LL |     #[bar = "..."]
    |       ^^^
 
 error: cannot find attribute `bar` in this scope
-  --> $DIR/subdiagnostic-derive.rs:199:7
+  --> $DIR/subdiagnostic-derive.rs:198:7
    |
 LL |     #[bar = 4]
    |       ^^^
 
 error: cannot find attribute `bar` in this scope
-  --> $DIR/subdiagnostic-derive.rs:211:7
+  --> $DIR/subdiagnostic-derive.rs:210:7
    |
 LL |     #[bar("...")]
    |       ^^^
 
 error: cannot find attribute `bar` in this scope
-  --> $DIR/subdiagnostic-derive.rs:272:7
+  --> $DIR/subdiagnostic-derive.rs:271:7
    |
 LL |     #[bar]
    |       ^^^
 
 error: cannot find attribute `bar` in this scope
-  --> $DIR/subdiagnostic-derive.rs:283:7
+  --> $DIR/subdiagnostic-derive.rs:282:7
    |
 LL |     #[bar = "..."]
    |       ^^^
 
 error: cannot find attribute `bar` in this scope
-  --> $DIR/subdiagnostic-derive.rs:294:7
+  --> $DIR/subdiagnostic-derive.rs:293:7
    |
 LL |     #[bar("...")]
    |       ^^^
 
 error[E0425]: cannot find value `slug` in module `crate::fluent_generated`
-  --> $DIR/subdiagnostic-derive.rs:124:9
+  --> $DIR/subdiagnostic-derive.rs:123:9
    |
 LL | #[label(slug)]
    |         ^^^^ not found in `crate::fluent_generated`
 
 error[E0425]: cannot find value `__code_29` in this scope
-  --> $DIR/subdiagnostic-derive.rs:703:10
+  --> $DIR/subdiagnostic-derive.rs:706:10
    |
 LL | #[derive(Subdiagnostic)]
    |          ^^^^^^^^^^^^^ not found in this scope