Modify find_expr from Span to better account for closures

Start pointing to where bindings were declared when they are captured in closures:

```
error[E0597]: `x` does not live long enough
  --> $DIR/suggest-return-closure.rs:23:9
   |
LL |     let x = String::new();
   |         - binding `x` declared here
...
LL |     |c| {
   |     --- value captured here
LL |         x.push(c);
   |         ^ borrowed value does not live long enough
...
LL | }
   | -- borrow later used here
   | |
   | `x` dropped here while still borrowed
```

Suggest cloning in more cases involving closures:

```
error[E0507]: cannot move out of `foo` in pattern guard
  --> $DIR/issue-27282-move-ref-mut-into-guard.rs:11:19
   |
LL |             if { (|| { let mut bar = foo; bar.take() })(); false } => {},
   |                   ^^                 --- move occurs because `foo` has type `&mut Option<&i32>`, which does not implement the `Copy` trait
   |                   |
   |                   `foo` is moved here
   |
   = note: variables bound in patterns cannot be moved from until after the end of the pattern guard
help: consider cloning the value if the performance cost is acceptable
   |
LL |             if { (|| { let mut bar = foo.clone(); bar.take() })(); false } => {},
   |                                         ++++++++
```

compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs

@@ -50,15 +50,22 @@ pub struct FindExprBySpan<'hir> {
     pub span: Span,
     pub result: Option<&'hir hir::Expr<'hir>>,
     pub ty_result: Option<&'hir hir::Ty<'hir>>,
+    pub tcx: TyCtxt<'hir>,
 }
 
 impl<'hir> FindExprBySpan<'hir> {
-    pub fn new(span: Span) -> Self {
-        Self { span, result: None, ty_result: None }
+    pub fn new(span: Span, tcx: TyCtxt<'hir>) -> Self {
+        Self { span, result: None, ty_result: None, tcx }
     }
 }
 
 impl<'v> Visitor<'v> for FindExprBySpan<'v> {
+    type NestedFilter = rustc_middle::hir::nested_filter::OnlyBodies;
+
+    fn nested_visit_map(&mut self) -> Self::Map {
+        self.tcx.hir()
+    }
+
     fn visit_expr(&mut self, ex: &'v hir::Expr<'v>) {
         if self.span == ex.span {
             self.result = Some(ex);

compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs

@@ -901,7 +901,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
             // Remove all the desugaring and macro contexts.
             span.remove_mark();
         }
-        let mut expr_finder = FindExprBySpan::new(span);
+        let mut expr_finder = FindExprBySpan::new(span, self.tcx);
         let Some(body_id) = self.tcx.hir().maybe_body_owned_by(obligation.cause.body_id) else {
             return;
         };
@@ -1367,7 +1367,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
                             return false;
                         };
                         let body = self.tcx.hir().body(body_id);
-                        let mut expr_finder = FindExprBySpan::new(span);
+                        let mut expr_finder = FindExprBySpan::new(span, self.tcx);
                         expr_finder.visit_expr(body.value);
                         let Some(expr) = expr_finder.result else {
                             return false;
@@ -1469,7 +1469,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
             // Remove all the hir desugaring contexts while maintaining the macro contexts.
             span.remove_mark();
         }
-        let mut expr_finder = super::FindExprBySpan::new(span);
+        let mut expr_finder = super::FindExprBySpan::new(span, self.tcx);
         let Some(body_id) = self.tcx.hir().maybe_body_owned_by(obligation.cause.body_id) else {
             return false;
         };

compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs

@@ -2457,7 +2457,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
                     && let Some(body_id) =
                         self.tcx.hir().maybe_body_owned_by(obligation.cause.body_id)
                 {
-                    let mut expr_finder = FindExprBySpan::new(span);
+                    let mut expr_finder = FindExprBySpan::new(span, self.tcx);
                     expr_finder.visit_expr(self.tcx.hir().body(body_id).value);
 
                     if let Some(hir::Expr {