Not implemented asserts to prevent silent fails

src/api/wayland/mod.rs

@@ -257,6 +257,10 @@ impl Window {
     {
         use self::wayland::internals::FFI;
 
+        // not implemented
+        assert!(win_attribs.min_dimensions.is_none());
+        assert!(win_attribs.max_dimensions.is_none());
+
         let wayland_context = match *WAYLAND_CONTEXT {
             Some(ref c) => c,
             None => return Err(CreationError::NotSupported),