Fix panic when spawning a program that does not exist

crates/lune-std-process/src/lib.rs

@@ -145,10 +145,7 @@ async fn process_spawn(
     lua: &Lua,
     (program, args, options): (String, Option<Vec<String>>, ProcessSpawnOptions),
 ) -> LuaResult<LuaTable> {
-    let res = lua
+    let res = lua.spawn(spawn_command(program, args, options)).await?;
-        .spawn(spawn_command(program, args, options))
-        .await
-        .expect("Failed to receive result of spawned process");
 
     /*
         NOTE: If an exit code was not given by the child process,

crates/lune/src/tests.rs

@@ -140,6 +140,7 @@ create_tests! {
     process_spawn_async: "process/spawn/async",
     process_spawn_basic: "process/spawn/basic",
     process_spawn_cwd: "process/spawn/cwd",
+    process_spawn_no_panic: "process/spawn/no_panic",
     process_spawn_shell: "process/spawn/shell",
     process_spawn_stdin: "process/spawn/stdin",
     process_spawn_stdio: "process/spawn/stdio",

tests/process/spawn/no_panic.luau

@@ -0,0 +1,7 @@
+local process = require("@lune/process")
+
+-- Spawning a child process for a non-existent
+-- program should not panic, but should error
+
+local success = pcall(process.spawn, "someProgramThatDoesNotExist")
+assert(not success, "Spawned a non-existent program")