On Linux (Fedora 36) using zig 0.9.1, using a completely fresh copy of zls.
➜ git clone --recurse-submodules https://github.com/zigtools/zls
Cloning into 'zls'...
<snip>
➜ cd zls
➜ zig build -Drelease-safe
./build.zig:12:8: error: no member named 'use_stage1' in struct 'std.build.LibExeObjStep'
exe.use_stage1 = true;
^
On Linux (Fedora 36) using zig 0.9.1, using a completely fresh copy of zls.