# Struct proc_macro::Span [−] [src]

    pub struct Span(_);

🔬 This is a nightly-only experimental API. (`proc_macro` #38356)

A region of source code, along with macro expansion information.

## Methods

### `impl Span`
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#### `pub fn def_site() -> Span`
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🔬 This is a nightly-only experimental API. (`proc_macro` #38356)

A span that resolves at the macro definition site.

### `impl Span`
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#### `pub fn call_site() -> Span`
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🔬 This is a nightly-only experimental API. (`proc_macro` #38356)

The span of the invocation of the current procedural macro.

#### `pub fn source_file(&self) -> SourceFile`
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🔬 This is a nightly-only experimental API. (`proc_macro` #38356)

The original source file into which this span points.

#### `pub fn parent(&self) -> Option<Span>`
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🔬 This is a nightly-only experimental API. (`proc_macro` #38356)

The `Span` for the tokens in the previous macro expansion from which `self` was generated from, if any.

#### `pub fn source(&self) -> Span`
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🔬 This is a nightly-only experimental API. (`proc_macro` #38356)

The span for the origin source code that `self` was generated from. If this `Span` wasn't generated from other macro expansions then the return value is the same as `*self`.

#### `pub fn start(&self) -> LineColumn`
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🔬 This is a nightly-only experimental API. (`proc_macro` #38356)

Get the starting line/column in the source file for this span.

#### `pub fn end(&self) -> LineColumn`
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🔬 This is a nightly-only experimental API. (`proc_macro` #38356)

Get the ending line/column in the source file for this span.

#### `pub fn join(&self, other: Span) -> Option<Span>`
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🔬 This is a nightly-only experimental API. (`proc_macro` #38356)

Create a new span encompassing `self` and `other`.

Returns `None` if `self` and `other` are from different files.

#### `pub fn resolved_at(&self, other: Span) -> Span`
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🔬 This is a nightly-only experimental API. (`proc_macro` #38356)

Creates a new span with the same line/column information as `self` but that resolves symbols as though it were at `other`.

#### `pub fn located_at(&self, other: Span) -> Span`
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🔬 This is a nightly-only experimental API. (`proc_macro` #38356)

Creates a new span with the same name resolution behavior as `self` but with the line/column information of `other`.

#### `pub fn error<T: Into<String>>(self, message: T) -> Diagnostic`
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🔬 This is a nightly-only experimental API. (`proc_macro` #38356)

Create a new `Diagnostic` with the given `message` at the span `self`.

#### `pub fn warning<T: Into<String>>(self, message: T) -> Diagnostic`
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🔬 This is a nightly-only experimental API. (`proc_macro` #38356)

Create a new `Diagnostic` with the given `message` at the span `self`.

#### `pub fn note<T: Into<String>>(self, message: T) -> Diagnostic`
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🔬 This is a nightly-only experimental API. (`proc_macro` #38356)

Create a new `Diagnostic` with the given `message` at the span `self`.

#### `pub fn help<T: Into<String>>(self, message: T) -> Diagnostic`
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🔬 This is a nightly-only experimental API. (`proc_macro` #38356)

Create a new `Diagnostic` with the given `message` at the span `self`.

## Trait Implementations

### `impl Copy for Span`
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### `impl Clone for Span`
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#### `fn clone(&self) -> Span`
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Returns a copy of the value. Read more

#### `fn clone_from(&mut self, source: &Self)`
1.0.0
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Performs copy-assignment from `source`. Read more

### `impl Debug for Span`
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#### `fn fmt(&self, __arg_0: &mut Formatter) -> Result`
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Formats the value using the given formatter. Read more

### `impl PartialEq for Span`
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#### `fn eq(&self, __arg_0: &Span) -> bool`
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This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, __arg_0: &Span) -> bool`
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This method tests for `!=`.

### `impl Eq for Span`
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