Fix compiler errors for latest zig changes

Author: sam701

src/app_runner.zig

@@ -76,7 +76,13 @@ pub const AppRunner = struct {
             processError(&printer, err, cr.error_data orelse unreachable, app);
             if (app.help_config.print_help_on_error) {
                 printer.printNewLine();
-                try help.print_command_help(&printer, app, try cr.command_path.toOwnedSlice(self.orig_allocator), cr.global_options);
+                try help.print_command_help(
+                    &printer,
+                    app,
+                    try cr.command_path.toOwnedSlice(self.orig_allocator),
+                    cr.global_options,
+                    self.orig_allocator,
+                );
             }
             std.process.exit(1);
         }

src/help.zig

@@ -14,10 +14,9 @@ pub fn print_command_help(
     app: *const command.App,
     command_path: []const *const command.Command,
     global_options: *const GlobalOptions,
+    alloc: Allocator,
 ) !void {
-    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
-    const allocator = gpa.allocator();
-    var arena = std.heap.ArenaAllocator.init(allocator);
+    var arena = std.heap.ArenaAllocator.init(alloc);
     defer arena.deinit();
 
     defer printer.flush();

src/parser.zig

@@ -263,7 +263,13 @@ pub fn Parser(comptime Iterator: type) type {
                 var buf: [4096]u8 = undefined;
                 var writer = std.Io.File.stdout().writer(self.io, &buf);
                 var printer = Printer.init(&writer);
-                try help.print_command_help(&printer, self.app, try self.command_path.toOwnedSlice(self.orig_allocator), self.global_options);
+                try help.print_command_help(
+                    &printer,
+                    self.app,
+                    try self.command_path.toOwnedSlice(self.orig_allocator),
+                    self.global_options,
+                    self.arena.child_allocator,
+                );
                 std.process.exit(0);
             }
 

src/value_ref.zig

@@ -105,7 +105,7 @@ const ValueList = struct {
         const gen = struct {
             fn createList(alloc: Allocator) Allocator.Error!*anyopaque {
                 const list = try alloc.create(List);
-                list.* = List{};
+                list.* = .empty;
                 return list;
             }
             fn addOne(list_ptr: *anyopaque, alloc: Allocator) Allocator.Error!*anyopaque {