rust/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.stderr

error: unsupported type attribute for diagnostic derive enum
  --> $DIR/diagnostic-derive.rs:39:1
   |
LL | #[diag(compiletest_example, code = "E0123")]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: diagnostic slug not specified
  --> $DIR/diagnostic-derive.rs:42:5
   |
LL |     Foo,
   |     ^^^
   |
   = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`

error: diagnostic slug not specified
  --> $DIR/diagnostic-derive.rs:44:5
   |
LL |     Bar,
   |     ^^^
   |
   = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`

error: `#[diag = ...]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:50:1
   |
LL | #[diag = "E0123"]
   | ^^^^^^^^^^^^^^^^^

error: `#[nonsense(...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:55:1
   |
LL | #[nonsense(compiletest_example, code = "E0123")]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: diagnostic slug not specified
  --> $DIR/diagnostic-derive.rs:55:1
   |
LL | / #[nonsense(compiletest_example, code = "E0123")]
LL | |
LL | |
LL | |
LL | | struct InvalidStructAttr {}
   | |___________________________^
   |
   = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`

error: `#[diag("...")]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:62:8
   |
LL | #[diag("E0123")]
   |        ^^^^^^^
   |
   = help: a diagnostic slug is required as the first argument

error: diagnostic slug not specified
  --> $DIR/diagnostic-derive.rs:62:1
   |
LL | / #[diag("E0123")]
LL | |
LL | |
LL | | struct InvalidLitNestedAttr {}
   | |______________________________^
   |
   = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`

error: `#[diag(nonsense(...))]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:73:8
   |
LL | #[diag(nonsense("foo"), code = "E0123", slug = "foo")]
   |        ^^^^^^^^^^^^^^^
   |
   = help: a diagnostic slug is required as the first argument

error: diagnostic slug not specified
  --> $DIR/diagnostic-derive.rs:73:1
   |
LL | / #[diag(nonsense("foo"), code = "E0123", slug = "foo")]
LL | |
LL | |
LL | | struct InvalidNestedStructAttr1 {}
   | |__________________________________^
   |
   = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`

error: `#[diag(nonsense = ...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:79:8
   |
LL | #[diag(nonsense = "...", code = "E0123", slug = "foo")]
   |        ^^^^^^^^^^^^^^^^
   |
   = help: only `code` is a valid nested attributes following the slug

error: `#[diag(slug = ...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:79:42
   |
LL | #[diag(nonsense = "...", code = "E0123", slug = "foo")]
   |                                          ^^^^^^^^^^^^
   |
   = help: only `code` is a valid nested attributes following the slug

error: diagnostic slug not specified
  --> $DIR/diagnostic-derive.rs:79:1
   |
LL | / #[diag(nonsense = "...", code = "E0123", slug = "foo")]
LL | |
LL | |
LL | |
LL | | struct InvalidNestedStructAttr2 {}
   | |__________________________________^
   |
   = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`

error: `#[diag(nonsense = ...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:86:8
   |
LL | #[diag(nonsense = 4, code = "E0123", slug = "foo")]
   |        ^^^^^^^^^^^^

error: `#[diag(slug = ...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:86:38
   |
LL | #[diag(nonsense = 4, code = "E0123", slug = "foo")]
   |                                      ^^^^^^^^^^^^
   |
   = help: only `code` is a valid nested attributes following the slug

error: diagnostic slug not specified
  --> $DIR/diagnostic-derive.rs:86:1
   |
LL | / #[diag(nonsense = 4, code = "E0123", slug = "foo")]
LL | |
LL | |
LL | |
LL | | struct InvalidNestedStructAttr3 {}
   | |__________________________________^
   |
   = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`

error: `#[diag(slug = ...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:93:45
   |
LL | #[diag(compiletest_example, code = "E0123", slug = "foo")]
   |                                             ^^^^^^^^^^^^
   |
   = help: only `code` is a valid nested attributes following the slug

error: `#[suggestion = ...]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:100:5
   |
LL |     #[suggestion = "bar"]
   |     ^^^^^^^^^^^^^^^^^^^^^

error: specified multiple times
  --> $DIR/diagnostic-derive.rs:107:8
   |
LL | #[diag(compiletest_example, code = "E0456")]
   |        ^^^^^^^^^^^^^^^^^^^
   |
note: previously specified here
  --> $DIR/diagnostic-derive.rs:106:8
   |
LL | #[diag(compiletest_example, code = "E0123")]
   |        ^^^^^^^^^^^^^^^^^^^

error: specified multiple times
  --> $DIR/diagnostic-derive.rs:107:36
   |
LL | #[diag(compiletest_example, code = "E0456")]
   |                                    ^^^^^^^
   |
note: previously specified here
  --> $DIR/diagnostic-derive.rs:106:36
   |
LL | #[diag(compiletest_example, code = "E0123")]
   |                                    ^^^^^^^

error: specified multiple times
  --> $DIR/diagnostic-derive.rs:113:52
   |
LL | #[diag(compiletest_example, code = "E0456", code = "E0457")]
   |                                                    ^^^^^^^
   |
note: previously specified here
  --> $DIR/diagnostic-derive.rs:113:36
   |
LL | #[diag(compiletest_example, code = "E0456", code = "E0457")]
   |                                    ^^^^^^^

error: `#[diag(compiletest_example)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:118:29
   |
LL | #[diag(compiletest_example, compiletest_example, code = "E0456")]
   |                             ^^^^^^^^^^^^^^^^^^^
   |
   = help: diagnostic slug must be the first argument

error: diagnostic slug not specified
  --> $DIR/diagnostic-derive.rs:123:1
   |
LL | struct KindNotProvided {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`

error: diagnostic slug not specified
  --> $DIR/diagnostic-derive.rs:126:1
   |
LL | / #[diag(code = "E0456")]
LL | |
LL | | struct SlugNotProvided {}
   | |_________________________^
   |
   = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`

error: the `#[primary_span]` attribute can only be applied to fields of type `Span` or `MultiSpan`
  --> $DIR/diagnostic-derive.rs:137:5
   |
LL |     #[primary_span]
   |     ^^^^^^^^^^^^^^^

error: `#[nonsense]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:145:5
   |
LL |     #[nonsense]
   |     ^^^^^^^^^^^

error: the `#[label(...)]` attribute can only be applied to fields of type `Span` or `MultiSpan`
  --> $DIR/diagnostic-derive.rs:162:5
   |
LL |     #[label(label)]
   |     ^^^^^^^^^^^^^^^

error: `name` doesn't refer to a field on this type
  --> $DIR/diagnostic-derive.rs:170:37
   |
LL |     #[suggestion(suggestion, code = "{name}")]
   |                                     ^^^^^^^^

error: invalid format string: expected `'}'` but string was terminated
  --> $DIR/diagnostic-derive.rs:175:10
   |
LL | #[derive(Diagnostic)]
   |          ^^^^^^^^^^ expected `'}'` in format string
   |
   = note: if you intended to print `{`, you can escape it using `{{`
   = note: this error originates in the derive macro `Diagnostic` (in Nightly builds, run with -Z macro-backtrace for more info)

error: invalid format string: unmatched `}` found
  --> $DIR/diagnostic-derive.rs:185:10
   |
LL | #[derive(Diagnostic)]
   |          ^^^^^^^^^^ unmatched `}` in format string
   |
   = note: if you intended to print `}`, you can escape it using `}}`
   = note: this error originates in the derive macro `Diagnostic` (in Nightly builds, run with -Z macro-backtrace for more info)

error: the `#[label(...)]` attribute can only be applied to fields of type `Span` or `MultiSpan`
  --> $DIR/diagnostic-derive.rs:205:5
   |
LL |     #[label(label)]
   |     ^^^^^^^^^^^^^^^

error: suggestion without `code = "..."`
  --> $DIR/diagnostic-derive.rs:224:5
   |
LL |     #[suggestion(suggestion)]
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^

error: `#[suggestion(nonsense = ...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:232:18
   |
LL |     #[suggestion(nonsense = "bar")]
   |                  ^^^^^^^^^^^^^^^^
   |
   = help: only `style`, `code` and `applicability` are valid nested attributes

error: suggestion without `code = "..."`
  --> $DIR/diagnostic-derive.rs:232:5
   |
LL |     #[suggestion(nonsense = "bar")]
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: `#[suggestion(msg = ...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:241:18
   |
LL |     #[suggestion(msg = "bar")]
   |                  ^^^^^^^^^^^
   |
   = help: only `style`, `code` and `applicability` are valid nested attributes

error: suggestion without `code = "..."`
  --> $DIR/diagnostic-derive.rs:241:5
   |
LL |     #[suggestion(msg = "bar")]
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: wrong field type for suggestion
  --> $DIR/diagnostic-derive.rs:264:5
   |
LL | /     #[suggestion(suggestion, code = "This is suggested code")]
LL | |
LL | |     suggestion: Applicability,
   | |_____________________________^
   |
   = help: `#[suggestion(...)]` should be applied to fields of type `Span` or `(Span, Applicability)`

error: specified multiple times
  --> $DIR/diagnostic-derive.rs:280:24
   |
LL |     suggestion: (Span, Span, Applicability),
   |                        ^^^^
   |
note: previously specified here
  --> $DIR/diagnostic-derive.rs:280:18
   |
LL |     suggestion: (Span, Span, Applicability),
   |                  ^^^^

error: specified multiple times
  --> $DIR/diagnostic-derive.rs:288:33
   |
LL |     suggestion: (Applicability, Applicability, Span),
   |                                 ^^^^^^^^^^^^^
   |
note: previously specified here
  --> $DIR/diagnostic-derive.rs:288:18
   |
LL |     suggestion: (Applicability, Applicability, Span),
   |                  ^^^^^^^^^^^^^

error: `#[label = ...]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:295:5
   |
LL |     #[label = "bar"]
   |     ^^^^^^^^^^^^^^^^

error: specified multiple times
  --> $DIR/diagnostic-derive.rs:446:44
   |
LL |     #[suggestion(suggestion, code = "...", applicability = "maybe-incorrect")]
   |                                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
note: previously specified here
  --> $DIR/diagnostic-derive.rs:448:24
   |
LL |     suggestion: (Span, Applicability),
   |                        ^^^^^^^^^^^^^

error: invalid applicability
  --> $DIR/diagnostic-derive.rs:454:44
   |
LL |     #[suggestion(suggestion, code = "...", applicability = "batman")]
   |                                            ^^^^^^^^^^^^^^^^^^^^^^^^

error: `#[label(foo)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:517:20
   |
LL |     #[label(label, foo)]
   |                    ^^^
   |
   = help: a diagnostic slug must be the first argument to the attribute

error: `#[label(foo = ...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:525:20
   |
LL |     #[label(label, foo = "...")]
   |                    ^^^^^^^^^^^

error: `#[label(foo(...))]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:533:20
   |
LL |     #[label(label, foo("..."))]
   |                    ^^^^^^^^^^

error: `#[primary_span]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:545:5
   |
LL |     #[primary_span]
   |     ^^^^^^^^^^^^^^^
   |
   = help: the `primary_span` field attribute is not valid for lint diagnostics

error: `#[error(...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:565:1
   |
LL | #[error(compiletest_example, code = "E0123")]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: diagnostic slug not specified
  --> $DIR/diagnostic-derive.rs:565:1
   |
LL | / #[error(compiletest_example, code = "E0123")]
LL | |
LL | |
LL | |
LL | | struct ErrorAttribute {}
   | |________________________^
   |
   = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`

error: `#[warn_(...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:572:1
   |
LL | #[warn_(compiletest_example, code = "E0123")]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: diagnostic slug not specified
  --> $DIR/diagnostic-derive.rs:572:1
   |
LL | / #[warn_(compiletest_example, code = "E0123")]
LL | |
LL | |
LL | |
LL | | struct WarnAttribute {}
   | |_______________________^
   |
   = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`

error: `#[lint(...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:579:1
   |
LL | #[lint(compiletest_example, code = "E0123")]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: diagnostic slug not specified
  --> $DIR/diagnostic-derive.rs:579:1
   |
LL | / #[lint(compiletest_example, code = "E0123")]
LL | |
LL | |
LL | |
LL | | struct LintAttributeOnSessionDiag {}
   | |____________________________________^
   |
   = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]`

error: `#[lint(...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:586:1
   |
LL | #[lint(compiletest_example, code = "E0123")]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: `#[lint(...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:586:1
   |
LL | #[lint(compiletest_example, code = "E0123")]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: diagnostic slug not specified
  --> $DIR/diagnostic-derive.rs:586:1
   |
LL | / #[lint(compiletest_example, code = "E0123")]
LL | |
LL | |
LL | |
LL | |
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:596:44
   |
LL |     #[suggestion(suggestion, code = "...", code = ",,,")]
   |                                            ^^^^^^^^^^^^
   |
note: previously specified here
  --> $DIR/diagnostic-derive.rs:596:30
   |
LL |     #[suggestion(suggestion, code = "...", code = ",,,")]
   |                              ^^^^^^^^^^^^

error: wrong types for suggestion
  --> $DIR/diagnostic-derive.rs:605:24
   |
LL |     suggestion: (Span, usize),
   |                        ^^^^^
   |
   = help: `#[suggestion(...)]` on a tuple field must be applied to fields of type `(Span, Applicability)`

error: wrong types for suggestion
  --> $DIR/diagnostic-derive.rs:613:17
   |
LL |     suggestion: (Span,),
   |                 ^^^^^^^
   |
   = help: `#[suggestion(...)]` on a tuple field must be applied to fields of type `(Span, Applicability)`

error: suggestion without `code = "..."`
  --> $DIR/diagnostic-derive.rs:620:5
   |
LL |     #[suggestion(suggestion)]
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^

error: `#[multipart_suggestion(...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:627:1
   |
LL | #[multipart_suggestion(suggestion)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: consider creating a `Subdiagnostic` instead

error: `#[multipart_suggestion(...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:630:1
   |
LL | #[multipart_suggestion()]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: consider creating a `Subdiagnostic` instead

error: `#[multipart_suggestion(...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:634:5
   |
LL |     #[multipart_suggestion(suggestion)]
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: consider creating a `Subdiagnostic` instead

error: `#[suggestion(...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:642:1
   |
LL | #[suggestion(suggestion, code = "...")]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: `#[label]` and `#[suggestion]` can only be applied to fields

error: `#[label]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:651:1
   |
LL | #[label]
   | ^^^^^^^^
   |
   = help: `#[label]` and `#[suggestion]` can only be applied to fields

error: `#[subdiagnostic(...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:685:5
   |
LL |     #[subdiagnostic(bad)]
   |     ^^^^^^^^^^^^^^^^^^^^^
   |
   = help: `eager` is the only supported nested attribute for `subdiagnostic`

error: `#[subdiagnostic = ...]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:693:5
   |
LL |     #[subdiagnostic = "bad"]
   |     ^^^^^^^^^^^^^^^^^^^^^^^^

error: `#[subdiagnostic(...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:701:5
   |
LL |     #[subdiagnostic(bad, bad)]
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: `eager` is the only supported nested attribute for `subdiagnostic`

error: `#[subdiagnostic(...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:709:5
   |
LL |     #[subdiagnostic("bad")]
   |     ^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: `eager` is the only supported nested attribute for `subdiagnostic`

error: `#[subdiagnostic(...)]` is not a valid attribute
  --> $DIR/diagnostic-derive.rs:717:5
   |
LL |     #[subdiagnostic(eager)]
   |     ^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: eager subdiagnostics are not supported on lints

error: expected at least one string literal for `code(...)`
  --> $DIR/diagnostic-derive.rs:775:18
   |
LL |     #[suggestion(code())]
   |                  ^^^^^^

error: `code(...)` must contain only string literals
  --> $DIR/diagnostic-derive.rs:783:23
   |
LL |     #[suggestion(code(foo))]
   |                       ^^^

error: `code = "..."`/`code(...)` must contain only string literals
  --> $DIR/diagnostic-derive.rs:791:18
   |
LL |     #[suggestion(code = 3)]
   |                  ^^^^^^^^

error: cannot find attribute `nonsense` in this scope
  --> $DIR/diagnostic-derive.rs:55:3
   |
LL | #[nonsense(compiletest_example, code = "E0123")]
   |   ^^^^^^^^

error: cannot find attribute `nonsense` in this scope
  --> $DIR/diagnostic-derive.rs:145:7
   |
LL |     #[nonsense]
   |       ^^^^^^^^

error: cannot find attribute `error` in this scope
  --> $DIR/diagnostic-derive.rs:565:3
   |
LL | #[error(compiletest_example, code = "E0123")]
   |   ^^^^^

error: cannot find attribute `warn_` in this scope
  --> $DIR/diagnostic-derive.rs:572:3
   |
LL | #[warn_(compiletest_example, code = "E0123")]
   |   ^^^^^ help: a built-in attribute with a similar name exists: `warn`

error: cannot find attribute `lint` in this scope
  --> $DIR/diagnostic-derive.rs:579:3
   |
LL | #[lint(compiletest_example, code = "E0123")]
   |   ^^^^ help: a built-in attribute with a similar name exists: `link`

error: cannot find attribute `lint` in this scope
  --> $DIR/diagnostic-derive.rs:586:3
   |
LL | #[lint(compiletest_example, code = "E0123")]
   |   ^^^^ help: a built-in attribute with a similar name exists: `link`

error: cannot find attribute `multipart_suggestion` in this scope
  --> $DIR/diagnostic-derive.rs:627:3
   |
LL | #[multipart_suggestion(suggestion)]
   |   ^^^^^^^^^^^^^^^^^^^^

error: cannot find attribute `multipart_suggestion` in this scope
  --> $DIR/diagnostic-derive.rs:630:3
   |
LL | #[multipart_suggestion()]
   |   ^^^^^^^^^^^^^^^^^^^^

error: cannot find attribute `multipart_suggestion` in this scope
  --> $DIR/diagnostic-derive.rs:634:7
   |
LL |     #[multipart_suggestion(suggestion)]
   |       ^^^^^^^^^^^^^^^^^^^^

error[E0425]: cannot find value `nonsense` in module `rustc_errors::fluent`
  --> $DIR/diagnostic-derive.rs:68:8
   |
LL | #[diag(nonsense, code = "E0123")]
   |        ^^^^^^^^ not found in `rustc_errors::fluent`

error[E0277]: the trait bound `Hello: IntoDiagnosticArg` is not satisfied
  --> $DIR/diagnostic-derive.rs:339:10
   |
LL | #[derive(Diagnostic)]
   |          ^^^^^^^^^^ the trait `IntoDiagnosticArg` is not implemented for `Hello`
   |
   = help: normalized in stderr
note: required by a bound in `DiagnosticBuilder::<'a, G>::set_arg`
  --> $COMPILER_DIR/rustc_errors/src/diagnostic_builder.rs:LL:CC
   = note: this error originates in the derive macro `Diagnostic` which comes from the expansion of the macro `forward` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 83 previous errors

Some errors have detailed explanations: E0277, E0425.
For more information about an error, try `rustc --explain E0277`.