feat: 数组支持 struct 元素类型 [Point; N]

src/sema/sema.c

@@ -719,12 +719,21 @@ static void analyze_node(AstNode* node, Scope* scope, ErrorList* errors, Arena*
             error_add(errors, "<sema>", node->loc.line, node->loc.col,
                       "数组索引必须是 i64 类型, 得到 '%s'", type_name(idx->type.kind));
         }
-        TypeKind elem_kind = sym->type == TYPE_ARRAY ? TYPE_I64 : sym->type;
+        TypeKind elem_kind = (sym->type == TYPE_ARRAY) ? sym->array_element_type : sym->type;
         if (val->type.kind != TYPE_ERROR && val->type.kind != elem_kind) {
             error_add(errors, "<sema>", node->loc.line, node->loc.col,
                       "数组元素类型不匹配: 期望 '%s'，得到 '%s'",
                       type_name(elem_kind), type_name(val->type.kind));
         }
+        // struct 元素类型时还需检查结构体名是否匹配
+        if (val->type.kind != TYPE_ERROR && elem_kind == TYPE_STRUCT
+            && sym->array_element_struct_name && val->type.struct_name) {
+            if (strcmp(sym->array_element_struct_name, val->type.struct_name) != 0) {
+                error_add(errors, "<sema>", node->loc.line, node->loc.col,
+                          "数组元素类型不匹配: 期望 '%s'，得到 '%s'",
+                          sym->array_element_struct_name, val->type.struct_name);
+            }
+        }
         node->type.kind = TYPE_VOID;
         break;
     }

test/programs/24_array_struct.l

@@ -0,0 +1,12 @@
+struct Point { x: i64, y: i64 }
+
+fn main() -> i64 {
+    let arr: [Point; 2] = arr;
+    arr[0] = Point { x: 10, y: 20 };
+    arr[1] = Point { x: 30, y: 40 };
+    print_i64(arr[0].x);
+    print_i64(arr[0].y);
+    print_i64(arr[1].x);
+    print_i64(arr[1].y);
+    return 0;
+}