fe6ad097c6
Because of type inference, duplicate obligations exist and cause duplicate errors. To avoid this, only display the first error for each (predicate,span). The inclusion of the span is somewhat bikesheddy, but *is* the more conservative option (it does not remove some instability, as duplicate obligations are ignored by `duplicate_set` under some inference conditions). Fixes #28098 cc #21528 (is it a dupe?)
31 lines
808 B
Rust
31 lines
808 B
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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struct MyStruct {
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x: isize,
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y: isize,
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}
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impl MyStruct {
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fn next(&mut self) -> Option<isize> {
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Some(self.x)
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}
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}
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pub fn main() {
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let mut bogus = MyStruct {
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x: 1,
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y: 2,
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};
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for x in bogus { //~ ERROR `core::iter::Iterator` is not implemented for the type `MyStruct`
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drop(x);
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}
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}
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