Move trait selection error reporting to its own top-level module

Author: compiler-errors

clippy_lints/src/eta_reduction.rs

@@ -15,7 +15,7 @@ use rustc_middle::ty::{
 use rustc_session::declare_lint_pass;
 use rustc_span::symbol::sym;
 use rustc_target::spec::abi::Abi;
-use rustc_trait_selection::traits::error_reporting::InferCtxtExt as _;
+use rustc_trait_selection::error_reporting::traits::InferCtxtExt as _;
 
 declare_clippy_lint! {
     /// ### What it does

clippy_lints/src/future_not_send.rs

@@ -9,7 +9,7 @@ use rustc_middle::ty::{self, AliasTy, ClauseKind, PredicateKind};
 use rustc_session::declare_lint_pass;
 use rustc_span::def_id::LocalDefId;
 use rustc_span::{sym, Span};
-use rustc_trait_selection::traits::error_reporting::suggestions::TypeErrCtxtExt;
+use rustc_trait_selection::error_reporting::traits::suggestions::TypeErrCtxtExt;
 use rustc_trait_selection::traits::{self, FulfillmentError, ObligationCtxt};
 
 declare_clippy_lint! {

clippy_lints/src/unconditional_recursion.rs

@@ -15,7 +15,7 @@ use rustc_middle::ty::{self, AssocKind, Ty, TyCtxt};
 use rustc_session::impl_lint_pass;
 use rustc_span::symbol::{kw, Ident};
 use rustc_span::{sym, Span};
-use rustc_trait_selection::traits::error_reporting::suggestions::ReturnsVisitor;
+use rustc_trait_selection::error_reporting::traits::suggestions::ReturnsVisitor;
 
 declare_clippy_lint! {
     /// ### What it does