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ParamEnvAnd::fully_perform: we have an ocx, use it #129078

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Aug 16, 2024
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ParamEnvAnd::fully_perform: we have an ocx, use it #129078

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38 changes: 3 additions & 35 deletions compiler/rustc_trait_selection/src/traits/query/type_op/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -170,44 +170,12 @@ where
// collecting region constraints via `region_constraints`.
let (mut output, _) = scrape_region_constraints(
infcx,
|_ocx| {
let (output, ei, mut obligations, _) =
|ocx| {
let (output, ei, obligations, _) =
Q::fully_perform_into(self, infcx, &mut region_constraints, span)?;
error_info = ei;

// Typically, instantiating NLL query results does not
// create obligations. However, in some cases there
// are unresolved type variables, and unify them *can*
// create obligations. In that case, we have to go
// fulfill them. We do this via a (recursive) query.
while !obligations.is_empty() {
trace!("{:#?}", obligations);
let mut progress = false;
for obligation in std::mem::take(&mut obligations) {
let obligation = infcx.resolve_vars_if_possible(obligation);
match ProvePredicate::fully_perform_into(
obligation.param_env.and(ProvePredicate::new(obligation.predicate)),
infcx,
&mut region_constraints,
span,
) {
Ok(((), _, new, certainty)) => {
obligations.extend(new);
progress = true;
if let Certainty::Ambiguous = certainty {
obligations.push(obligation);
}
}
Err(_) => obligations.push(obligation),
}
}
if !progress {
infcx.dcx().span_bug(
span,
format!("ambiguity processing {obligations:?} from {self:?}"),
);
}
}
ocx.register_obligations(obligations);
Ok(output)
},
"fully_perform",
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