src/test/ui/inference/inference_unstable_forced.rs


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// If the unstable API is the only possible solution,
// still emit E0658 "use of unstable library feature".

// aux-build:inference_unstable_iterator.rs

extern crate inference_unstable_iterator;

use inference_unstable_iterator::IpuIterator;

fn main() {
    assert_eq!('x'.ipu_flatten(), 0);   //~ ERROR E0658
}