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//
// 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);
}
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