Struct LocalId 

pub struct LocalId(pub u32);

Local binding identifier. Unique per function body (not per program) — backends look up the binding by walking the body’s Let chain, so collision across functions isn’t a concern.

Phase 2 picks “assign at MIR construction time” over “carry the HIR slot index” (the latter was the strawman alternative listed in the RFC). The carry-from-HIR option would have meant MIR’s local space matches whatever the resolver chose — fine for the VM consumer, but the future inliner / monomorphizer needs the freedom to introduce fresh locals during optimization passes, and inheriting HIR’s numbering would silently overlap with those.

Seed during Phase 3 (waves 1-3b): the lowerer seeds new LocalIds from the resolver’s slot indices (ResolvedExpr::Resolved { slot, .. }, FnResolution.local_slots, ResolvedMatchArm.binding_slots) and grows synthetic locals from local_count upward for Stmt::Expr intermediates the resolver didn’t see. The slot space is unique per function so reuse is safe. Later optimizer passes are still free to renumber — LocalId is just an opaque identity per body, not a promise about resolver lineage.

Tuple Fields

0: u32

Trait Implementations

impl Clone for LocalId

fn clone(&self) -> LocalId

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for LocalId

impl Debug for LocalId

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

Formats the value using the given formatter.

impl Display for LocalId

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

Formats the value using the given formatter.

impl Eq for LocalId

impl Hash for LocalId

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 LocalId

fn cmp(&self, other: &LocalId) -> 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 LocalId

fn eq(&self, other: &LocalId) -> 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 LocalId

fn partial_cmp(&self, other: &LocalId) -> 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 StructuralPartialEq for LocalId