Auto merge of rust-lang#127500 - compiler-errors:consolidate-region-e…

…rrors, r=lcnr

Consolidate region error reporting in `rustc_infer`

More work on rust-lang#127492. Separate but important step, since I'm gonna likely pull everything else here into another module.

I don't think I'm confident whether `nice_region_error` should be a submodule of the new `rustc_infer::infer::error_reporting::region` module, so I left it alone for now.

r? lcnr

compiler/rustc_borrowck/src/diagnostics/region_errors.rs

@@ -10,14 +10,12 @@ use rustc_hir::GenericBound::Trait;
 use rustc_hir::QPath::Resolved;
 use rustc_hir::WherePredicate::BoundPredicate;
 use rustc_hir::{PolyTraitRef, TyKind, WhereBoundPredicate};
-use rustc_infer::infer::{
-    error_reporting::nice_region_error::{
-        self, find_anon_type, find_param_with_region, suggest_adding_lifetime_params,
-        HirTraitObjectVisitor, NiceRegionError, TraitObjectVisitor,
-    },
-    error_reporting::unexpected_hidden_region_diagnostic,
-    NllRegionVariableOrigin, RelateParamBound,
+use rustc_infer::infer::error_reporting::nice_region_error::{
+    self, find_anon_type, find_param_with_region, suggest_adding_lifetime_params,
+    HirTraitObjectVisitor, NiceRegionError, TraitObjectVisitor,
 };
+use rustc_infer::infer::error_reporting::region::unexpected_hidden_region_diagnostic;
+use rustc_infer::infer::{NllRegionVariableOrigin, RelateParamBound};
 use rustc_middle::bug;
 use rustc_middle::hir::place::PlaceBase;
 use rustc_middle::mir::{ConstraintCategory, ReturnConstraint};