Support enum in memory map patch address

Author: HKalbasi

crates/hir-ty/src/consteval/tests.rs

@@ -2441,14 +2441,14 @@ fn const_loop() {
 fn const_transfer_memory() {
     check_number(
         r#"
-    //- minicore: slice, index, coerce_unsized
+    //- minicore: slice, index, coerce_unsized, option
     const A1: &i32 = &1;
     const A2: &i32 = &10;
     const A3: [&i32; 3] = [&1, &2, &100];
-    const A4: (i32, &i32) = (1, &1000);
-    const GOAL: i32 = *A1 + *A2 + *A3[2] + *A4.1;
+    const A4: (i32, &i32, Option<&i32>) = (1, &1000, Some(&10000));
+    const GOAL: i32 = *A1 + *A2 + *A3[2] + *A4.1 + *A4.2.unwrap_or(&5);
     "#,
-        1111,
+        11111,
     );
 }
 

crates/hir-ty/src/mir/eval.rs

@@ -2007,7 +2007,28 @@ impl Evaluator<'_> {
                     }
                 }
                 AdtId::UnionId(_) => (),
-                AdtId::EnumId(_) => (),
+                AdtId::EnumId(e) => {
+                    if let Some((variant, layout)) = detect_variant_from_bytes(
+                        &layout,
+                        self.db,
+                        self.trait_env.clone(),
+                        self.read_memory(addr, layout.size.bytes_usize())?,
+                        e,
+                    ) {
+                        let ev = EnumVariantId { parent: e, local_id: variant };
+                        for (i, (_, ty)) in self.db.field_types(ev.into()).iter().enumerate() {
+                            let offset = layout.fields.offset(i).bytes_usize();
+                            let ty = ty.clone().substitute(Interner, subst);
+                            self.patch_addresses(
+                                patch_map,
+                                old_vtable,
+                                addr.offset(offset),
+                                &ty,
+                                locals,
+                            )?;
+                        }
+                    }
+                }
             },
             TyKind::Tuple(_, subst) => {
                 for (id, ty) in subst.iter(Interner).enumerate() {