Remove unnecessary explicit enum

This can be computed (as it is now)

src/server/message_parser.zig

@@ -1,37 +1,8 @@
 const std = @import("std");
 
-pub const MessageType = enum {
+pub const MessageType = @typeInfo(Message).@"union".tag_type.?;
-    info,
-    connect,
-    @"pub",
-    hpub,
-    sub,
-    unsub,
-    msg,
-    hmsg,
-    ping,
-    pong,
-    @"+ok",
-    @"-err",
 
-    fn parseMemEql(input: []const u8) ?MessageType {
+pub const Message = union(enum) {
-        // if (std.mem.eql(u8, "INFO", input)) return .info;
-        if (std.mem.eql(u8, "CONNECT", input)) return .connect;
-        if (std.mem.eql(u8, "PUB", input)) return .@"pub";
-        if (std.mem.eql(u8, "HPUB", input)) return .hpub;
-        if (std.mem.eql(u8, "SUB", input)) return .sub;
-        if (std.mem.eql(u8, "UNSUB", input)) return .unsub;
-        // if (std.mem.eql(u8, "MSG", input)) return .msg;
-        // if (std.mem.eql(u8, "HMSG", input)) return .hmsg;
-        if (std.mem.eql(u8, "PING", input)) return .ping;
-        if (std.mem.eql(u8, "PONG", input)) return .pong;
-        // if (std.mem.eql(u8, "@"+OK"", input)) return .@"+ok";
-        // if (std.mem.eql(u8, "@"-ERR"", input)) return .@"-err";
-        return error.InvalidMessageType;
-    }
-};
-
-pub const Message = union(MessageType) {
     info: ServerInfo,
     connect: Connect,
     @"pub": Pub,
@@ -437,6 +408,7 @@ fn parsePub(alloc: std.mem.Allocator, in: *std.Io.Reader) !Message {
     var third: ?std.ArrayList(u8) = null;
     defer if (third) |*t| t.deinit(alloc);
     var payload: std.Io.Writer.Allocating = .init(alloc);
+    errdefer payload.deinit();
 
     sw: switch (@as(States, .before_second)) {
         .before_second => {
@@ -574,6 +546,7 @@ fn parseHPub(alloc: std.mem.Allocator, in: *std.Io.Reader) !Message {
     var fourth: ?std.ArrayList(u8) = null;
     defer if (fourth) |*f| f.deinit(alloc);
     var payload: std.Io.Writer.Allocating = .init(alloc);
+    errdefer payload.deinit();
 
     sw: switch (@as(States, .before_second)) {
         .before_second => {