error[E0644]: closure/generator type that references itself
  --> $DIR/unboxed-closure-no-cyclic-sig.rs:18:7
   |
LL |     g(|_| {  }); //~ ERROR closure/generator type that references itself
   |       ^^^^^^^^ cyclic type of infinite size
   |
   = note: closures cannot capture themselves or take themselves as argument;
           this error may be the result of a recent compiler bug-fix,
           see https://github.com/rust-lang/rust/issues/46062 for more details

error: aborting due to previous error

For more information about this error, try `rustc --explain E0644`.