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3 - Make more use of let_chains

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Continuation of #94376.

cc #53667
This commit is contained in:
Caio 2022-02-27 11:10:20 -03:00
parent bab4c13f64
commit 0eb8b32de3
6 changed files with 44 additions and 58 deletions
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13
compiler/rustc_borrowck/src/diagnostics/region_errors.rs
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@ -140,14 +140,11 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
/// Returns `true` if a closure is inferred to be an `FnMut` closure.
fn is_closure_fn_mut(&self, fr: RegionVid) -> bool {
if let Some(ty::ReFree(free_region)) = self.to_error_region(fr).as_deref() {
if let ty::BoundRegionKind::BrEnv = free_region.bound_region {
if let DefiningTy::Closure(_, substs) =
self.regioncx.universal_regions().defining_ty
{
return substs.as_closure().kind() == ty::ClosureKind::FnMut;
}
}
if let Some(ty::ReFree(free_region)) = self.to_error_region(fr).as_deref()
&& let ty::BoundRegionKind::BrEnv = free_region.bound_region
&& let DefiningTy::Closure(_, substs) = self.regioncx.universal_regions().defining_ty
{
return substs.as_closure().kind() == ty::ClosureKind::FnMut;
}
false