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// Test that type inference fails where there are multiple possible return types
// for the `?` operator.
fn f(x: &i32) -> Result<i32, ()> {
Ok(*x)
}
fn g() -> Result<Vec<i32>, ()> {
let l = [1, 2, 3, 4];
l.iter().map(f).collect()? //~ ERROR type annotations needed
}
fn main() {
g();
}
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