Traits for function items

hi @steffahn, do you remember if, at that time (when you wrote a ZeroSizedFunction in playground for Implementing traits on function pointers - #2 by steffahn - help - The Rust Programming Language Forum) the last line of

    let v = 42;
    // not a nice error message, but the following (if uncommented) doesn’t compile
    let a = (move || println!("{:?}", v)).as_fn();

was refused at compile time, or at runtime? With current stable (v. 1.96.1) it's refused at runtime only! Maybe rustc got lazy.