diff --git a/src/build/UnicodeTables.zig b/src/build/UnicodeTables.zig
index 9972c851a..aba3e8f24 100644
--- a/src/build/UnicodeTables.zig
+++ b/src/build/UnicodeTables.zig
@@ -21,6 +21,9 @@ pub fn init(b: *std.Build, uucode_tables: std.Build.LazyPath) !UnicodeTables {
             .omit_frame_pointer = false,
             .unwind_tables = .sync,
         }),
+
+        // TODO: x86_64 self-hosted crashes
+        .use_llvm = true,
     });
 
     const symbols_exe = b.addExecutable(.{
@@ -32,6 +35,9 @@ pub fn init(b: *std.Build, uucode_tables: std.Build.LazyPath) !UnicodeTables {
             .omit_frame_pointer = false,
             .unwind_tables = .sync,
         }),
+
+        // TODO: x86_64 self-hosted crashes
+        .use_llvm = true,
     });
 
     if (b.lazyDependency("uucode", .{
diff --git a/src/unicode/Properties.zig b/src/unicode/Properties.zig
index b7840743a..c8c4a581c 100644
--- a/src/unicode/Properties.zig
+++ b/src/unicode/Properties.zig
@@ -24,13 +24,9 @@ pub fn eql(a: Properties, b: Properties) bool {
 // Needed for lut.Generator
 pub fn format(
     self: Properties,
-    comptime layout: []const u8,
-    opts: std.fmt.FormatOptions,
-    writer: anytype,
+    writer: *std.Io.Writer,
 ) !void {
-    _ = layout;
-    _ = opts;
-    try std.fmt.format(writer,
+    try writer.print(
         \\.{{
         \\    .width= {},
         \\    .grapheme_boundary_class= .{s},
diff --git a/src/unicode/lut.zig b/src/unicode/lut.zig
index e10c5c0b8..da90f1ee7 100644
--- a/src/unicode/lut.zig
+++ b/src/unicode/lut.zig
@@ -54,12 +54,14 @@ pub fn Generator(
             defer blocks_map.deinit();
 
             // Our stages
-            var stage1 = std.ArrayList(u16).init(alloc);
-            defer stage1.deinit();
-            var stage2 = std.ArrayList(u16).init(alloc);
-            defer stage2.deinit();
-            var stage3 = std.ArrayList(Elem).init(alloc);
-            defer stage3.deinit();
+            var stage1: std.ArrayList(u16) = .empty;
+            var stage2: std.ArrayList(u16) = .empty;
+            var stage3: std.ArrayList(Elem) = .empty;
+            defer {
+                stage1.deinit(alloc);
+                stage2.deinit(alloc);
+                stage3.deinit(alloc);
+            }
 
             var block: Block = undefined;
             var block_len: u16 = 0;
@@ -74,7 +76,7 @@ pub fn Generator(
                     }
 
                     const idx = stage3.items.len;
-                    try stage3.append(elem);
+                    try stage3.append(alloc, elem);
                     break :block_idx idx;
                 };
 
@@ -96,11 +98,11 @@ pub fn Generator(
                         u16,
                         stage2.items.len,
                     ) orelse return error.Stage2TooLarge;
-                    for (block[0..block_len]) |entry| try stage2.append(entry);
+                    for (block[0..block_len]) |entry| try stage2.append(alloc, entry);
                 }
 
                 // Map stage1 => stage2 and reset our block
-                try stage1.append(gop.value_ptr.*);
+                try stage1.append(alloc, gop.value_ptr.*);
                 block_len = 0;
             }
 
@@ -109,11 +111,11 @@ pub fn Generator(
             assert(stage2.items.len <= std.math.maxInt(u16));
             assert(stage3.items.len <= std.math.maxInt(u16));
 
-            const stage1_owned = try stage1.toOwnedSlice();
+            const stage1_owned = try stage1.toOwnedSlice(alloc);
             errdefer alloc.free(stage1_owned);
-            const stage2_owned = try stage2.toOwnedSlice();
+            const stage2_owned = try stage2.toOwnedSlice(alloc);
             errdefer alloc.free(stage2_owned);
-            const stage3_owned = try stage3.toOwnedSlice();
+            const stage3_owned = try stage3.toOwnedSlice(alloc);
             errdefer alloc.free(stage3_owned);
 
             return .{
@@ -145,7 +147,7 @@ pub fn Tables(comptime Elem: type) type {
         /// Writes the lookup table as Zig to the given writer. The
         /// written file exports three constants: stage1, stage2, and
         /// stage3. These can be used to rebuild the lookup table in Zig.
-        pub fn writeZig(self: *const Self, writer: anytype) !void {
+        pub fn writeZig(self: *const Self, writer: *std.Io.Writer) !void {
             try writer.print(
                 \\//! This file is auto-generated. Do not edit.
                 \\
@@ -168,7 +170,13 @@ pub fn Tables(comptime Elem: type) type {
                 \\
                 \\pub const stage3: [{}]Elem = .{{
             , .{self.stage3.len});
-            for (self.stage3) |entry| try writer.print("{},", .{entry});
+            for (self.stage3) |entry| {
+                if (@typeInfo(@TypeOf(entry)) == .@"struct" and
+                    @hasDecl(@TypeOf(entry), "format"))
+                    try writer.print("{f},", .{entry})
+                else
+                    try writer.print("{},", .{entry});
+            }
             try writer.writeAll(
                 \\};
                 \\    };
diff --git a/src/unicode/props_uucode.zig b/src/unicode/props_uucode.zig
index ba0511ea4..6aed7d7d5 100644
--- a/src/unicode/props_uucode.zig
+++ b/src/unicode/props_uucode.zig
@@ -84,7 +84,11 @@ pub fn main() !void {
     defer alloc.free(t.stage1);
     defer alloc.free(t.stage2);
     defer alloc.free(t.stage3);
-    try t.writeZig(std.io.getStdOut().writer());
+
+    var buf: [4096]u8 = undefined;
+    var stdout = std.fs.File.stdout().writer(&buf);
+    try t.writeZig(&stdout.interface);
+    try stdout.end();
 
     // Uncomment when manually debugging to see our table sizes.
     // std.log.warn("stage1={} stage2={} stage3={}", .{
diff --git a/src/unicode/symbols_uucode.zig b/src/unicode/symbols_uucode.zig
index 3da019e81..8cbd59211 100644
--- a/src/unicode/symbols_uucode.zig
+++ b/src/unicode/symbols_uucode.zig
@@ -30,7 +30,11 @@ pub fn main() !void {
     defer alloc.free(t.stage1);
     defer alloc.free(t.stage2);
     defer alloc.free(t.stage3);
-    try t.writeZig(std.io.getStdOut().writer());
+
+    var buf: [4096]u8 = undefined;
+    var stdout = std.fs.File.stdout().writer(&buf);
+    try t.writeZig(&stdout.interface);
+    try stdout.end();
 
     // Uncomment when manually debugging to see our table sizes.
     // std.log.warn("stage1={} stage2={} stage3={}", .{