Module pat 

As explained in crate::usefulness, values and patterns are made from constructors applied to fields. This file defines types that represent patterns in this way.

Structs

DeconstructedPat

Values and patterns can be represented as a constructor applied to some fields. This represents a pattern in this form. A DeconstructedPat will almost always come from user input; the only exception are some Wildcards introduced during pattern lowering.

IndexedPat

A pattern with an index denoting which field it corresponds to.

PatId 🔒

A globally unique id to distinguish patterns.

WitnessPat

Same idea as DeconstructedPat, except this is a fictitious pattern built up for diagnostics purposes. As such they don’t use interning and can be cloned.

Enums

PatOrWild 🔒

Represents either a pattern obtained from user input or a wildcard constructed during the algorithm. Do not use Wild to represent a wildcard pattern comping from user input.