error: `#[derive(SessionDiagnostic)]` can only be used on structs
  --> $DIR/session-derive-errors.rs:28:1
   |
LL | #[error = "E0123"]
   | ^^^^^^^^^^^^^^^^^^

error: `#[label = ...]` is not a valid SessionDiagnostic struct attribute
  --> $DIR/session-derive-errors.rs:37:1
   |
LL | #[label = "This is in the wrong place"]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: `#[suggestion = ...]` is not a valid SessionDiagnostic field attribute
  --> $DIR/session-derive-errors.rs:44:5
   |
LL |     #[suggestion = "this is the wrong kind of attribute"]
   |     ^

error: `error` specified multiple times
  --> $DIR/session-derive-errors.rs:52:11
   |
LL | #[error = "E0456"]
   |           ^^^^^^^

error: `lint` specified when `error` was already specified
  --> $DIR/session-derive-errors.rs:58:10
   |
LL | #[lint = "some_useful_lint"]
   |          ^^^^^^^^^^^^^^^^^^

error: `code` not specified
  --> $DIR/session-derive-errors.rs:67:1
   |
LL | struct ErrorCodeNotProvided {}
   | ^^^^^^
   |
   = help: use the [code = "..."] attribute to set this diagnostic's error code 

error: the `#[message = "..."]` attribute can only be applied to fields of type Span
  --> $DIR/session-derive-errors.rs:95:5
   |
LL |     #[message = "this message is applied to a String field"]
   |     ^

error: `name` doesn't refer to a field on this type
  --> $DIR/session-derive-errors.rs:102:1
   |
LL | #[message = "This error has a field, and references {name}"]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: invalid format string: expected `'}'` but string was terminated
  --> $DIR/session-derive-errors.rs:110:1
   |
LL | #[error = "E0123"]
   |               - because of this opening brace
LL | #[message = "This is missing a closing brace: {name"]
   | ^ expected `'}'` in format string
   |
   = note: if you intended to print `{`, you can escape it using `{{`
   = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: invalid format string: unmatched `}` found
  --> $DIR/session-derive-errors.rs:119:1
   |
LL | #[message = "This is missing an opening brace: name}"]
   | ^ unmatched `}` in format string
   |
   = note: if you intended to print `}`, you can escape it using `}}`
   = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: The `#[label = ...]` attribute can only be applied to fields of type Span
  --> $DIR/session-derive-errors.rs:138:5
   |
LL |     #[label = "See here"]
   |     ^

error: `nonsense` is not a valid key for `#[suggestion(...)]`
  --> $DIR/session-derive-errors.rs:163:18
   |
LL |     #[suggestion(nonsense = "This is nonsense")]
   |                  ^^^^^^^^

error: `msg` is not a valid key for `#[suggestion(...)]`
  --> $DIR/session-derive-errors.rs:171:18
   |
LL |     #[suggestion(msg = "This is a suggestion")]
   |                  ^^^

error: missing suggestion message
  --> $DIR/session-derive-errors.rs:179:7
   |
LL |     #[suggestion(code = "This is suggested code")]
   |       ^^^^^^^^^^
   |
   = help: provide a suggestion message using #[suggestion(message = "...")]

error: wrong field type for suggestion
  --> $DIR/session-derive-errors.rs:194:5
   |
LL |     #[suggestion(message = "This is a message", code = "This is suggested code")]
   |     ^
   |
   = help: #[suggestion(...)] should be applied to fields of type Span or (Span, Applicability)

error: type of field annotated with `#[suggestion(...)]` contains more than one Span
  --> $DIR/session-derive-errors.rs:209:5
   |
LL |     #[suggestion(message = "This is a message", code = "This is suggested code")]
   |     ^

error: type of field annotated with `#[suggestion(...)]` contains more than one Applicability
  --> $DIR/session-derive-errors.rs:217:5
   |
LL |     #[suggestion(message = "This is a message", code = "This is suggested code")]
   |     ^

error: invalid annotation list `#[label(...)]`
  --> $DIR/session-derive-errors.rs:225:7
   |
LL |     #[label("wrong kind of annotation for label")]
   |       ^^^^^

error: aborting due to 18 previous errors