# [−][src]Struct proc_macro::Diagnostic

    pub struct Diagnostic { /* fields omitted */ }

🔬 This is a nightly-only experimental API. (`proc_macro_diagnostic` #54140)

A structure representing a diagnostic message and associated children messages.

## Methods

### `impl Diagnostic`[src]

#### `pub fn new<T: Into<String>>(level: Level, message: T) -> Diagnostic`[src]

🔬 This is a nightly-only experimental API. (`proc_macro_diagnostic` #54140)

Creates a new diagnostic with the given `level` and `message`.

#### `pub fn spanned<S, T>(spans: S, level: Level, message: T) -> Diagnostic where
S: MultiSpan,
T: Into<String>,` [src]

🔬 This is a nightly-only experimental API. (`proc_macro_diagnostic` #54140)

Creates a new diagnostic with the given `level` and `message` pointing to the given set of `spans`.

#### `pub fn span_error<S, T>(self, spans: S, message: T) -> Diagnostic where
S: MultiSpan,
T: Into<String>,` [src]

🔬 This is a nightly-only experimental API. (`proc_macro_diagnostic` #54140)

Adds a new child diagnostic message to `self` with the level identified by this method's name with the given `spans` and `message`.

#### `pub fn error<T: Into<String>>(self, message: T) -> Diagnostic`[src]

🔬 This is a nightly-only experimental API. (`proc_macro_diagnostic` #54140)

Adds a new child diagnostic message to `self` with the level identified by this method's name with the given `message`.

#### `pub fn span_warning<S, T>(self, spans: S, message: T) -> Diagnostic where
S: MultiSpan,
T: Into<String>,` [src]

🔬 This is a nightly-only experimental API. (`proc_macro_diagnostic` #54140)

Adds a new child diagnostic message to `self` with the level identified by this method's name with the given `spans` and `message`.

#### `pub fn warning<T: Into<String>>(self, message: T) -> Diagnostic`[src]

🔬 This is a nightly-only experimental API. (`proc_macro_diagnostic` #54140)

Adds a new child diagnostic message to `self` with the level identified by this method's name with the given `message`.

#### `pub fn span_note<S, T>(self, spans: S, message: T) -> Diagnostic where
S: MultiSpan,
T: Into<String>,` [src]

🔬 This is a nightly-only experimental API. (`proc_macro_diagnostic` #54140)

Adds a new child diagnostic message to `self` with the level identified by this method's name with the given `spans` and `message`.

#### `pub fn note<T: Into<String>>(self, message: T) -> Diagnostic`[src]

🔬 This is a nightly-only experimental API. (`proc_macro_diagnostic` #54140)

Adds a new child diagnostic message to `self` with the level identified by this method's name with the given `message`.

#### `pub fn span_help<S, T>(self, spans: S, message: T) -> Diagnostic where
S: MultiSpan,
T: Into<String>,` [src]

🔬 This is a nightly-only experimental API. (`proc_macro_diagnostic` #54140)

Adds a new child diagnostic message to `self` with the level identified by this method's name with the given `spans` and `message`.

#### `pub fn help<T: Into<String>>(self, message: T) -> Diagnostic`[src]

🔬 This is a nightly-only experimental API. (`proc_macro_diagnostic` #54140)

Adds a new child diagnostic message to `self` with the level identified by this method's name with the given `message`.

#### `pub fn level(&self) -> Level`[src]

🔬 This is a nightly-only experimental API. (`proc_macro_diagnostic` #54140)

Returns the diagnostic `level` for `self`.

#### `pub fn set_level(&mut self, level: Level)`[src]

🔬 This is a nightly-only experimental API. (`proc_macro_diagnostic` #54140)

Sets the level in `self` to `level`.

#### `pub fn message(&self) -> &str`[src]

🔬 This is a nightly-only experimental API. (`proc_macro_diagnostic` #54140)

Returns the message in `self`.

#### `pub fn set_message<T: Into<String>>(&mut self, message: T)`[src]

🔬 This is a nightly-only experimental API. (`proc_macro_diagnostic` #54140)

Sets the message in `self` to `message`.

#### `pub fn spans(&self) -> &[Span]`[src]

🔬 This is a nightly-only experimental API. (`proc_macro_diagnostic` #54140)

Returns the `Span`s in `self`.

#### `pub fn set_spans<S: MultiSpan>(&mut self, spans: S)`[src]

🔬 This is a nightly-only experimental API. (`proc_macro_diagnostic` #54140)

Sets the `Span`s in `self` to `spans`.

#### `pub fn children(&self) -> Children`[src]

🔬 This is a nightly-only experimental API. (`proc_macro_diagnostic` #54140)

Returns an iterator over the children diagnostics of `self`.

#### `pub fn emit(self)`[src]

🔬 This is a nightly-only experimental API. (`proc_macro_diagnostic` #54140)

Emit the diagnostic.

## Trait Implementations

### `impl Clone for Diagnostic`[src]

#### `fn clone(&self) -> Diagnostic`[src]

Returns a copy of the value. Read more

#### `fn clone_from(&mut self, source: &Self)`1.0.0[src]

Performs copy-assignment from `source`. Read more

### `impl Debug for Diagnostic`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result`[src]

Formats the value using the given formatter. Read more

## Auto Trait Implementations

### `impl Unpin for Diagnostic`

### `impl !Sync for Diagnostic`

### `impl !Send for Diagnostic`

### `impl UnwindSafe for Diagnostic`

### `impl RefUnwindSafe for Diagnostic`

## Blanket Implementations

### `impl<T> ToOwned for T where
T: Clone,` [src]

#### `type Owned = T`

The resulting type after obtaining ownership.

#### `fn to_owned(&self) -> T`[src]

Creates owned data from borrowed data, usually by cloning. Read more

#### `fn clone_into(&self, target: &mut T)`[src]

🔬 This is a nightly-only experimental API. (`toowned_clone_into` #41263)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

### `impl<T, U> Into<U> for T where
U: From<T>,` [src]

#### `fn into(self) -> U`[src]

Performs the conversion.

### `impl<T> From<T> for T`[src]

#### `fn from(t: T) -> T`[src]

Performs the conversion.

### `impl<T, U> TryFrom<U> for T where
U: Into<T>,` [src]

#### `type Error = Infallible`

The type returned in the event of a conversion error.

#### `fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`[src]

Performs the conversion.

### `impl<T, U> TryInto<U> for T where
U: TryFrom<T>,` [src]

#### `type Error = <U as TryFrom<T>>::Error`

The type returned in the event of a conversion error.

#### `fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`[src]

Performs the conversion.

### `impl<T> BorrowMut<T> for T where
T: ?Sized,` [src]

#### `fn borrow_mut(&mut self) -> &mut T`[src]

Mutably borrows from an owned value. Read more

### `impl<T> Borrow<T> for T where
T: ?Sized,` [src]

#### `fn borrow(&self) -> &T`[src]

Immutably borrows from an owned value. Read more

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `fn type_id(&self) -> TypeId`[src]

Gets the `TypeId` of `self`. Read more

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g., `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g., `vec -> usize` or `* -> vec`)

Search multiple things at once by splitting your query with comma (e.g., `str,u8` or `String,struct:Vec,test`)