Auto merge of rust-lang#87996 - sexxi-goose:fix-87988, r=nikomatsakis

RFC2229 Add missing edge case

Closes rust-lang#87988

This PR fixes an ICE where a match discriminant is not being read when expected. This ICE was the result of a missing edge case which assumed that if a pattern is of type `PatKind::TupleStruct(..) | PatKind::Path(..) | PatKind::Struct(..) | PatKind::Tuple(..)` then a place could only be a multi variant if the place is of type kind Adt.

Author: bors