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Bounds seem to be ignored in negative impls #23072
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Yeah, hmm, this is caused by the way that trait dispatch picks a concrete impl if its the only thing available without recursively evaluating the bounds. Hmm. It makes sense for positive impls but for negative impls doesn't seem quite right. Niko -------- Original message -------- #![feature(optin_builtin_traits)] use std::marker::MarkerTrait; unsafe trait Pod: MarkerTrait {} trait Bound: MarkerTrait {} // it seems that the bound is ignored here, i.e. this gets treated as fn is_pod<T: Pod>(_: T) {} fn main() { — |
This turns out to be a deeper issue. We should hold off on removing feature-gate for negative impls until it is resolved. The core issue that that negative impls with extra bounds become effectively negative bounds:
Now |
error still persist in
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triage: OIBITs cannot have bounds anymore. yay. |
cc @nikomatsakis @flaper87
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