fix map update syntax

vlib/v/ast/table.v

@@ -26,6 +26,7 @@ pub mut:
 	arr_pop          bool            // arr.pop()
 	arr_init         bool            // [1, 2, 3]
 	arr_map          bool            // []map[key]value
+	map_update       bool            // {...foo}
 	interpolation    bool            // '${foo} ${bar}'
 	option_or_result bool            // has panic call
 	print_types      map[int]bool    // print() idx types

vlib/v/checker/containers.v

@@ -506,6 +506,7 @@ fn (mut c Checker) map_init(mut node ast.MapInit) ast.Type {
 	}
 
 	if (node.keys.len > 0 && node.vals.len > 0) || node.has_update_expr {
+		c.table.used_features.map_update = true
 		mut map_type := ast.void_type
 		use_expected_type := c.expected_type != ast.void_type && !c.inside_const
 			&& c.table.sym(c.expected_type).kind == .map && !(c.inside_fn_arg

vlib/v/markused/markused.v

@@ -149,6 +149,7 @@ pub fn mark_used(mut table ast.Table, mut pref_ pref.Preferences, ast_files []&a
 			core_fns << 'new_array_from_c_array_noscan'
 			core_fns << '__new_array_with_multi_default'
 			core_fns << '__new_array_with_multi_default_noscan'
+			core_fns << '__new_array_with_array_default'
 		}
 		if table.used_features.option_or_result {
 			core_fns << '_option_ok'
@@ -172,6 +173,10 @@ pub fn mark_used(mut table ast.Table, mut pref_ pref.Preferences, ast_files []&a
 			core_fns << map_idx_str + '.clone'
 			table.used_features.used_maps++
 		}
+		if table.used_features.map_update {
+			core_fns << 'new_map_update_init'
+			table.used_features.used_maps++
+		}
 		all_fn_root_names << core_fns
 	}