| // |
| // We get an error message at the top of file (dummy span). |
| // This is not helpful, but also kind of annoying to prevent, |
| // so for now just live with it. |
| // This test case was originally for issue #2258. |
| |
| trait ToOpt: Sized { |
| fn to_option(&self) -> Option<Self>; |
| } |
| |
| impl ToOpt for usize { |
| fn to_option(&self) -> Option<usize> { |
| Some(*self) |
| } |
| } |
| |
| impl<T:Clone> ToOpt for Option<T> { |
| fn to_option(&self) -> Option<Option<T>> { |
| Some((*self).clone()) |
| } |
| } |
| |
| fn function<T:ToOpt + Clone>(counter: usize, t: T) { |
| //~^ ERROR reached the recursion limit while instantiating `function::<std::option::Option< |
| if counter > 0 { |
| function(counter - 1, t.to_option()); |
| // FIXME(#4287) Error message should be here. It should be |
| // a type error to instantiate `test` at a type other than T. |
| } |
| } |
| |
| fn main() { |
| function(22, 22); |
| } |