Enum Region

pub enum Region {
    Static,
    BVar(DeBruijnId, RegionId),
    Erased,
    Unknown,
}

Variants

Static

Static region

BVar(DeBruijnId, RegionId)

Bound region variable.

Important:

Similarly to what the Rust compiler does, we use De Bruijn indices to identify groups of bound variables, and variable identifiers to identity the variables inside the groups.

For instance, we have the following:

                    we compute the De Bruijn indices from here
                           VVVVVVVVVVVVVVVVVVVVVVV
fn f<'a, 'b>(x: for<'c> fn(&'a u8, &'b u16, &'c u32) -> u64) {}
     ^^^^^^         ^^       ^       ^        ^
       |      De Bruijn: 0   |       |        |
 De Bruijn: 1                |       |        |
                       De Bruijn: 1  |    De Bruijn: 0
                          Var id: 0  |       Var id: 0
                                     |
                               De Bruijn: 1
                                  Var id: 1

Erased

Erased region

Unknown

For error reporting.

Implementations

impl Region

pub fn is_static(&self) -> bool

pub fn is_bvar(&self) -> bool

pub fn is_erased(&self) -> bool

pub fn is_unknown(&self) -> bool

impl Region

pub fn as_static(&self) -> Option<()>

pub fn as_bvar(&self) -> Option<(&DeBruijnId, &RegionId)>

pub fn as_erased(&self) -> Option<()>

pub fn as_unknown(&self) -> Option<()>

impl Region

pub fn as_static_mut(&mut self) -> Option<()>

pub fn as_bvar_mut(&mut self) -> Option<(&mut DeBruijnId, &mut RegionId)>

pub fn as_erased_mut(&mut self) -> Option<()>

pub fn as_unknown_mut(&mut self) -> Option<()>

Trait Implementations

impl Clone for Region

fn clone(&self) -> Region

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Region

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Region

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Region

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Drive for Region

fn drive<V: Visitor>(&self, visitor: &mut V)

impl DriveMut for Region

fn drive_mut<V: VisitorMut>(&mut self, visitor: &mut V)

impl<C: AstFormatter> FmtWithCtx<C> for Region

fn fmt_with_ctx(&self, ctx: &C) -> String

fn fmt_with_ctx_and_indent(&self, _tab: &str, _ctx: &C) -> String

fn with_ctx<'a>(&'a self, ctx: &'a C) -> impl Display + 'a

Returns a struct that implements Display. This allows the following:

impl Hash for Region

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Region

fn cmp(&self, other: &Region) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Region

fn eq(&self, other: &Region) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Region

fn partial_cmp(&self, other: &Region) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for Region

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for Region

impl Eq for Region

impl StructuralPartialEq for Region