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