Parsing problem(?) with Box<dyn FnOnce()>

[ijackson]

Another oddity I'm afraid. This:

use fehler::throws;

#[throws(std::io::Error)] // ERROR: Wrapper type must be a normal path type
pub fn zonk() {
  let mut _unused : Box<dyn FnOnce()> = Box::new(||());
}

pub fn works0() -> Result<(), std::io::Error> {
  let mut _unused : Box<dyn FnOnce()> = Box::new(||());
  Ok(())
}

pub fn works1() {
  let mut _unused : Box<dyn FnOnce()> = Box::new(||());
}

#[throws(std::io::Error)]
pub fn works2() {
  let mut _unused : Box<()> = Box::new(());
}

Produces this:

error: custom attribute panicked
 --> src/lib.rs:4:1
  |
3 | #[throws(std::io::Error)] // ERROR: Wrapper type must be a normal path type
  | ^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = help: message: Wrapper type must be a normal path type

I think zonk should compile and be equivalent to works0. Again, this test case is minimised from a larger program. Thanks for your attention.

[Nemo157]

This appears to have been fixed by cc7b192