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Use let else here

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Santiago Pastorino 2022-03-17 14:55:16 -03:00
parent 9c076f3f90
commit ba8b4a4f82
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1 changed files with 31 additions and 31 deletions
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62
compiler/rustc_trait_selection/src/traits/coherence.rs
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@ -387,42 +387,42 @@ fn resolve_negative_obligation<'cx, 'tcx>(
) -> bool { ) -> bool {
let tcx = infcx.tcx; let tcx = infcx.tcx;
if let Some(o) = o.flip_polarity(tcx) { let Some(o) = o.flip_polarity(tcx) else {
let mut fulfillment_cx = FulfillmentContext::new(); return false;
fulfillment_cx.register_predicate_obligation(infcx, o); };
let errors = fulfillment_cx.select_all_or_error(infcx); let mut fulfillment_cx = FulfillmentContext::new();
fulfillment_cx.register_predicate_obligation(infcx, o);
if !errors.is_empty() { let errors = fulfillment_cx.select_all_or_error(infcx);
return false;
}
let mut outlives_env = OutlivesEnvironment::new(param_env); if !errors.is_empty() {
// FIXME -- add "assumed to be well formed" types into the `outlives_env` return false;
// "Save" the accumulated implied bounds into the outlives environment
// (due to the FIXME above, there aren't any, but this step is still needed).
// The "body id" is given as `CRATE_HIR_ID`, which is the same body-id used
// by the "dummy" causes elsewhere (body-id is only relevant when checking
// function bodies with closures).
outlives_env.save_implied_bounds(CRATE_HIR_ID);
infcx.process_registered_region_obligations(
outlives_env.region_bound_pairs_map(),
Some(tcx.lifetimes.re_root_empty),
param_env,
);
let errors = infcx.resolve_regions(region_context, &outlives_env, RegionckMode::default());
if !errors.is_empty() {
return false;
}
return true;
} }
false let mut outlives_env = OutlivesEnvironment::new(param_env);
// FIXME -- add "assumed to be well formed" types into the `outlives_env`
// "Save" the accumulated implied bounds into the outlives environment
// (due to the FIXME above, there aren't any, but this step is still needed).
// The "body id" is given as `CRATE_HIR_ID`, which is the same body-id used
// by the "dummy" causes elsewhere (body-id is only relevant when checking
// function bodies with closures).
outlives_env.save_implied_bounds(CRATE_HIR_ID);
infcx.process_registered_region_obligations(
outlives_env.region_bound_pairs_map(),
Some(tcx.lifetimes.re_root_empty),
param_env,
);
let errors = infcx.resolve_regions(region_context, &outlives_env, RegionckMode::default());
if !errors.is_empty() {
return false;
}
true
} }
pub fn trait_ref_is_knowable<'tcx>( pub fn trait_ref_is_knowable<'tcx>(