Created attachment 268812 [details]
Patch file for crates/extension_host/src/wasm_host/wit/since_v0_8_0.rs

After installing the Typst extension and its respective LSP,  TinyMist, Zed would crash soon after opening the directory containing any .typ files.

After running Zed from the command line with the --foreground flag and setting env RUST_BACKTRACE=1 I was able to find the cause of the crash:

thread 'tokio-runtime-worker' (146651) panicked at crates/extension_host/src/wasm_host/wit/since_v0_8_0.rs:840:22:
unsupported os
stack backtrace:
note: Some details are omitted, run with RUST_BACKTRACE=full for a verbose backtrace.

The cause of the panic is a match statement inside of the current_platform() function inside of crates/extension_host/src/wasm_host/wit/since_v0_8_0.rs   Because FreeBSD is not in the list of supported operating systems the function panics.  

impl platform::Host for WasmState {
    async fn current_platform(&mut self) -> Result<(platform::Os, platform::Architecture)> {
        Ok((
            match env::consts::OS {
                "macos" => platform::Os::Mac,
                "linux" => platform::Os::Linux,
                "windows" => platform::Os::Windows,
                _ => panic!("unsupported os"),
            },
           // ... omitted
     }      
}
The solution to this bug can be found by adding the string "freebsd" to the list of supported systems, and returning the enum platform::Os::Linux as many of these extensions work well due to FreeBSD's similar ABI and Linux Compatibility Layer. 
"linux" | "freebsd"  => platform::Os::Linux,

This will address the error and prevent the crash. This also resolves the same crash for any other WASM-based extension that calls current_platform(), including the LaTeX, HTML, GLSL, and typos extensions.

Please see the attached patch file