Add clarification on E0308 about opaque types
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@ -268,6 +268,7 @@ impl<'tcx> TyCtxt<'tcx> {
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let e_str = values.expected.to_string();
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let f_str = values.found.to_string();
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if &e_str == &f_str && &e_str == "impl std::future::Future" {
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// FIXME: use non-string based check.
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db.help("if both futures resolve to the same type, consider `await`ing \
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on both of them");
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}
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