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use super::{EvalCtxt, NestedGoals};
use crate::solve::inspect;
use rustc_middle::traits::query::NoSolution;
impl<'a, 'tcx> EvalCtxt<'a, 'tcx> {
pub(in crate::solve) fn commit_if_ok<T>(
&mut self,
f: impl FnOnce(&mut EvalCtxt<'_, 'tcx>) -> Result<T, NoSolution>,
) -> Result<T, NoSolution> {
let mut nested_ecx = EvalCtxt {
infcx: self.infcx,
variables: self.variables,
var_values: self.var_values,
predefined_opaques_in_body: self.predefined_opaques_in_body,
max_input_universe: self.max_input_universe,
search_graph: self.search_graph,
nested_goals: NestedGoals::new(),
tainted: self.tainted,
inspect: self.inspect.new_probe(),
};
let result = nested_ecx.infcx.commit_if_ok(|_| f(&mut nested_ecx));
if result.is_ok() {
let EvalCtxt {
infcx: _,
variables: _,
var_values: _,
predefined_opaques_in_body: _,
max_input_universe: _,
search_graph: _,
nested_goals,
tainted,
inspect,
} = nested_ecx;
self.nested_goals.extend(nested_goals);
self.tainted = tainted;
self.inspect.integrate_snapshot(inspect);
} else {
nested_ecx.inspect.probe_kind(inspect::ProbeKind::CommitIfOk);
self.inspect.finish_probe(nested_ecx.inspect);
}
result
}
}
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