gistfile1.txt

/ ** This doesn't work ** /
//let class_name = to_wstring("minifb_window");
			
/ ** However calling to_wstring() code not from within external function DOES! **/
let v: Vec<u16> = OsStr::new("minifb_window").encode_wide().chain(Some(0).into_iter()).collect();
let class_name = v.as_ptr();

Possible explanation (see definition of as_ptr()): https://doc.rust-lang.org/std/vec/struct.Vec.html 

"The caller must ensure that the slice outlives the pointer this function returns, or else it will end up pointing to garbage."