rust/tests/ui/cast/issue-85586.rs

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// Check that errors for unresolved types in cast expressions are reported
// for the offending subexpression, not the whole cast expression.
#![allow(unused_variables)]
fn main() {
let a = [1, 2, 3].iter().sum();
let b = (a + 1) as usize;
//~^ ERROR: type annotations needed [E0282]
}