rust/src/test/compile-fail/issue-2611-5.rs

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// Tests that ty params get matched correctly when comparing
// an impl against a trait
import iter;
import iter::BaseIter;
trait A {
fn b<C:copy, D>(x: C) -> C;
}
struct E {
f: int
}
impl E: A {
// n.b. The error message is awful -- see #3404
fn b<F:copy, G>(_x: G) -> G { fail } //~ ERROR method `b` has an incompatible type
}
fn main() {}