pub struct TypeVariableTable<'a, 'tcx> {
    storage: &'a mut TypeVariableStorage<'tcx>,
    undo_log: &'a mut InferCtxtUndoLogs<'tcx>,
}

Fields

storage: &'a mut TypeVariableStorage<'tcx>undo_log: &'a mut InferCtxtUndoLogs<'tcx>

Implementations

Returns the origin that was given when vid was created.

Note that this function does not return care whether vid has been unified with something else or not.

Records that a == b, depending on dir.

Precondition: neither a nor b are known.

Records that a <: b, depending on dir.

Precondition: neither a nor b are known.

Instantiates vid with the type ty.

Precondition: vid must not have been previously instantiated.

Creates a new type variable.

  • diverging: indicates if this is a “diverging” type variable, e.g., one created as the type of a return expression. The code in this module doesn’t care if a variable is diverging, but the main Rust type-checker will sometimes “unify” such variables with the ! or () types.
  • origin: indicates why the type variable was created. The code in this module doesn’t care, but it can be useful for improving error messages.

Returns the number of type variables created thus far.

Returns the “root” variable of vid in the eq_relations equivalence table. All type variables that have been equated will yield the same root variable (per the union-find algorithm), so root_var(a) == root_var(b) implies that a == b (transitively).

Returns the “root” variable of vid in the sub_relations equivalence table. All type variables that have been are related via equality or subtyping will yield the same root variable (per the union-find algorithm), so sub_root_var(a) == sub_root_var(b) implies that:

exists X. (a <: X || X <: a) && (b <: X || X <: b)

Returns true if a and b have same “sub-root” (i.e., exists some type X such that forall i in {a, b}. (i <: X || X <: i).

Retrieves the type to which vid has been instantiated, if any.

An always-inlined variant of probe, for very hot call sites.

If t is a type-inference variable, and it has been instantiated, then return the with which it was instantiated. Otherwise, returns t.

Returns a range of the type variables created during the snapshot.

Returns indices of all variables that are not yet instantiated.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.

Size: 16 bytes