pub struct BoundVar {
    pub debruijn: DebruijnIndex,
    pub index: usize,
}
Expand description

Identifies a particular bound variable within a binder. Variables are identified by the combination of a DebruijnIndex, which identifies the binder, and an index within that binder.

Consider this case:

forall<'a, 'b> { forall<'c, 'd> { ... } }

Within the ... term:

  • the variable 'a have a debruijn index of 1 and index 0
  • the variable 'b have a debruijn index of 1 and index 1
  • the variable 'c have a debruijn index of 0 and index 0
  • the variable 'd have a debruijn index of 0 and index 1

The variables 'a and 'b both have debruijn index of 1 because, counting out, they are the 2nd binder enclosing .... The indices identify the location within that binder.

The variables 'c and 'd both have debruijn index of 0 because they appear in the innermost binder enclosing the .... The indices identify the location within that binder.

Fields

debruijn: DebruijnIndex

Debruijn index, which identifies the binder.

index: usize

Index within the binder.

Implementations

Creates a new bound variable.

Casts the bound variable to a type.

Wrap the bound variable in a lifetime.

Wraps the bound variable in a constant.

True if this variable is bound within the amount innermost binders.

Adjusts the debruijn index (see DebruijnIndex::shifted_in).

Adjusts the debruijn index (see DebruijnIndex::shifted_in).

Adjusts the debruijn index (see DebruijnIndex::shifted_in).

Adjusts the debruijn index (see DebruijnIndex::shifted_in).

Return the index of the bound variable, but only if it is bound at the innermost binder. Otherwise, returns None.

Return the index of the bound variable, but only if it is bound at the innermost binder. Otherwise, returns None.

Trait Implementations

Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
Feeds this value into the given Hasher. Read more
Feeds a slice of this type into the given Hasher. Read more
This method returns an Ordering between self and other. Read more
Compares and returns the maximum of two values. Read more
Compares and returns the minimum of two values. Read more
Restrict a value to a certain interval. Read more
This method tests for self and other values to be equal, and is used by ==. Read more
This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more
This method returns an ordering between self and other values if one exists. Read more
This method tests less than (for self and other) and is used by the < operator. Read more
This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
This method tests greater than (for self and other) and is used by the > operator. Read more
This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

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
Cast a value to type U using CastTo.

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 resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
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.