diff --git a/src/buffer/Manager.zig b/src/buffer/Manager.zig
index 6cb1d99..3594e69 100644
--- a/src/buffer/Manager.zig
+++ b/src/buffer/Manager.zig
@@ -32,8 +32,7 @@ fn add_buffer(self: *Self, buffer: *Buffer) error{OutOfMemory}!void {
     try self.buffers.put(self.allocator, try self.allocator.dupe(u8, buffer.get_file_path()), buffer);
 }
 
-pub fn delete_buffer(self: *Self, buffer_: *Buffer) void {
-    const buffer = self.buffer_from_ref(self.buffer_to_ref(buffer_)) orelse return; // check buffer is valid
+pub fn delete_buffer(self: *Self, buffer: *Buffer) void {
     if (self.buffers.fetchRemove(buffer.get_file_path())) |kv| {
         self.allocator.free(kv.key);
         kv.value.deinit();
diff --git a/src/tui/editor.zig b/src/tui/editor.zig
index 617a4ff..211e62a 100644
--- a/src/tui/editor.zig
+++ b/src/tui/editor.zig
@@ -4863,52 +4863,6 @@ pub const Editor = struct {
     }
     pub const dump_current_line_tree_meta: Meta = .{ .description = "Debug: dump current line (tree)" };
 
-    pub fn dump_document_tree(self: *Self, _: Context) Result {
-        const syn = self.syntax orelse return error.Stop;
-        const tree = syn.tree orelse return error.Stop;
-        const ast_ = tree.getRootNode().asSExpressionString();
-        defer syntax.Node.freeSExpressionString(ast_);
-        var scratch_name: std.Io.Writer.Allocating = .init(self.allocator);
-        defer scratch_name.deinit();
-
-        var ast: std.Io.Writer.Allocating = .init(self.allocator);
-        defer ast.deinit();
-        var iter = ast_;
-        var indt: usize = 0;
-        while (iter.len > 0) : (iter = iter[1..]) {
-            const char = iter[0];
-            switch (char) {
-                '(' => {
-                    if (indt > 0) {
-                        try ast.writer.writeByte('\n');
-                        for (0..indt) |_| try ast.writer.writeAll("  ");
-                    }
-                    indt += 1;
-                    try ast.writer.writeByte(char);
-                },
-                ')' => {
-                    indt -= 1;
-                    try ast.writer.writeByte(char);
-                },
-                ' ' => {
-                    if (iter.len > 1 and iter[1] == '(')
-                        continue;
-                    try ast.writer.writeByte(char);
-                },
-                else => try ast.writer.writeByte(char),
-            }
-        }
-
-        try if (self.file_path) |file_path|
-            scratch_name.writer.print("*ast: {s}*", .{file_path})
-        else
-            scratch_name.writer.print("*ast*", .{});
-        try command.executeName("open_scratch_buffer", command.fmt(.{ scratch_name.written(), ast.written(), "text" }));
-        tp.self_pid().send(.{ "cmd", "navigate", .{ .file = scratch_name.written() } }) catch return;
-        tp.self_pid().send(.{ "cmd", "set_file_type", .{"scheme"} }) catch return;
-    }
-    pub const dump_document_tree_meta: Meta = .{ .description = "Debug: dump current document tree" };
-
     pub fn undo(self: *Self, _: Context) Result {
         try self.restore_undo();
         self.clamp();