Struct syntax::ext::hygiene::SyntaxContext [] [src]

pub struct SyntaxContext(_);
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A SyntaxContext represents a chain of macro expansions (represented by marks).

Methods

impl SyntaxContext
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🔬 This is a nightly-only experimental API. (rustc_private)

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Extend a syntax context with a given mark

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🔬 This is a nightly-only experimental API. (rustc_private)

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Adjust this context for resolution in a scope created by the given expansion. For example, consider the following three resolutions of f: rust mod foo { pub fn f() {} } // `f`'s `SyntaxContext` is empty. m!(f); macro m($f:ident) { mod bar { pub fn f() {} // `f`'s `SyntaxContext` has a single `Mark` from `m`. pub fn $f() {} // `$f`'s `SyntaxContext` is empty. } foo::f(); // `f`'s `SyntaxContext` has a single `Mark` from `m` //^ Since `mod foo` is outside this expansion, `adjust` removes the mark from `f`, //| and it resolves to `::foo::f`. bar::f(); // `f`'s `SyntaxContext` has a single `Mark` from `m` //^ Since `mod bar` not outside this expansion, `adjust` does not change `f`, //| and it resolves to `::bar::f`. bar::$f(); // `f`'s `SyntaxContext` is empty. //^ Since `mod bar` is not outside this expansion, `adjust` does not change `$f`, //| and it resolves to `::bar::$f`. } This returns the expansion whose definition scope we use to privacy check the resolution, or None if we privacy check as usual (i.e. not w.r.t. a macro definition scope).

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🔬 This is a nightly-only experimental API. (rustc_private)

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Adjust this context for resolution in a scope created by the given expansion via a glob import with the given SyntaxContext. For example, rust m!(f); macro m($i:ident) { mod foo { pub fn f() {} // `f`'s `SyntaxContext` has a single `Mark` from `m`. pub fn $i() {} // `$i`'s `SyntaxContext` is empty. } n(f); macro n($j:ident) { use foo::*; f(); // `f`'s `SyntaxContext` has a mark from `m` and a mark from `n` //^ `glob_adjust` removes the mark from `n`, so this resolves to `foo::f`. $i(); // `$i`'s `SyntaxContext` has a mark from `n` //^ `glob_adjust` removes the mark from `n`, so this resolves to `foo::$i`. $j(); // `$j`'s `SyntaxContext` has a mark from `m` //^ This cannot be glob-adjusted, so this is a resolution error. } } This returns None if the context cannot be glob-adjusted. Otherwise, it returns the scope to use when privacy checking (see adjust for details).

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🔬 This is a nightly-only experimental API. (rustc_private)

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Undo glob_adjust if possible: rust if let Some(privacy_checking_scope) = self.reverse_glob_adjust(expansion, glob_ctxt) { assert!(self.glob_adjust(expansion, glob_ctxt) == Some(privacy_checking_scope)); }

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🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Trait Implementations

impl PartialEq<SyntaxContext> for SyntaxContext
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl PartialEq<SyntaxContext> for SyntaxContext
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl Encodable for SyntaxContext
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🔬 This is a nightly-only experimental API. (rustc_private)

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impl Hash for SyntaxContext
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Feeds this value into the given [Hasher]. Read more

1.3.0
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Feeds a slice of this type into the given [Hasher]. Read more

impl Default for SyntaxContext
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Returns the "default value" for a type. Read more

impl Clone for SyntaxContext
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Returns a copy of the value. Read more

1.0.0
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Performs copy-assignment from source. Read more

impl PartialOrd<SyntaxContext> for SyntaxContext
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This method returns an ordering between self and other values if one exists. Read more

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This method tests less than (for self and other) and is used by the < operator. Read more

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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

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This method tests greater than (for self and other) and is used by the > operator. Read more

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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

impl PartialOrd<SyntaxContext> for SyntaxContext
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This method returns an ordering between self and other values if one exists. Read more

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This method tests less than (for self and other) and is used by the < operator. Read more

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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

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This method tests greater than (for self and other) and is used by the > operator. Read more

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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

impl Debug for SyntaxContext
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Formats the value using the given formatter.

impl Copy for SyntaxContext
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impl Eq for SyntaxContext
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impl Ord for SyntaxContext
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This method returns an Ordering between self and other. Read more

1.21.0
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Compares and returns the maximum of two values. Read more

1.21.0
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Compares and returns the minimum of two values. Read more

impl Decodable for SyntaxContext
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🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?