Add pattern types to ast

compiler/rustc_ast/src/ast.rs

@@ -2152,6 +2152,9 @@ pub enum TyKind {
     MacCall(P<MacCall>),
     /// Placeholder for a `va_list`.
     CVarArgs,
+    /// Pattern types like `u32 as 1..=`, which is the same as `NonZeroU32`,
+    /// just as part of the type system.
+    Pat(P<Ty>, P<Pat>),
     /// Sometimes we need a dummy value when no error has occurred.
     Dummy,
     /// Placeholder for a kind that has failed to be defined.