mirror of https://github.com/rust-lang/rust
26 lines
711 B
Rust
26 lines
711 B
Rust
//@ build-fail
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//@ compile-flags:-C overflow-checks=off
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//@ normalize-stderr-test: ".nll/" -> "/"
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enum Nil {NilValue}
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struct Cons<T> {head:isize, tail:T}
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trait Dot {fn dot(&self, other:Self) -> isize;}
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impl Dot for Nil {
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fn dot(&self, _:Nil) -> isize {0}
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}
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impl<T:Dot> Dot for Cons<T> {
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fn dot(&self, other:Cons<T>) -> isize {
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self.head * other.head + self.tail.dot(other.tail)
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}
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}
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fn test<T:Dot> (n:isize, i:isize, first:T, second:T) ->isize {
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match n { 0 => {first.dot(second)}
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_ => {test (n-1, i+1, Cons {head:2*i+1, tail:first}, Cons{head:i*i, tail:second})}
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//~^ ERROR recursion limit
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}
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}
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pub fn main() {
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let n = test(1, 0, Nil::NilValue, Nil::NilValue);
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println!("{}", n);
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}
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