Adding line causes repeatable freeze in neovim

[kpence]

If I open a file with this in my nvim:

const std = @import("std");

const Register = struct {
    string: []const u8,
    value: packed union {
        u16: u16,
        split_u8s: packed struct {
            high: u8,
            low: u8,
        },
    },
    fn create(new_string: []const u8) Self {
        return .{
            new_string,
            .{
                .u16 = 0
            },
        };
    }
};

pub fn main() !void {
    const stdout = std.io.getStdOut().writer();
    stdout.writeAll("Hello world");
}

And then add the following line:

@@ -1,6 +1,7 @@
 const std = @import("std");

 const Register = struct {
+    const Self = @This;
     string: []const u8,
     value: packed union {
         u16: u16,

This causes my nvim to freeze.

Here is my .vimrc

syntax on
filetype plugin indent on

" Obligatory settings
set autoindent
set cindent
set sw=4
set ts=4
set et
set number
set clipboard=unnamed

" vim plugins
" let g:zig_fmt_autosave = 0
call plug#begin('~/.vim/plugged')
Plug 'neoclide/coc.nvim', {'branch': 'release'}
Plug 'tpope/vim-surround'
Plug 'ziglang/zig.vim'
call plug#end()

This is my nvim version:

$ nvim --version
NVIM v0.8.3
Build type: Release
LuaJIT 2.1.0-beta3
Compiled by builduser

Features: +acl +iconv +tui
See ":help feature-compile"

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/usr/share/nvim"

Run :checkhealth for more info