Find correct span when suggesting using clone

Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>

Author: xizheyin

compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs

@@ -1302,8 +1302,10 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 None => ".clone()".to_string(),
             };
 
+            let span = expr.span.find_oldest_ancestor_in_same_ctxt().shrink_to_hi();
+
             diag.span_suggestion_verbose(
-                expr.span.shrink_to_hi(),
+                span,
                 "consider using clone here",
                 suggestion,
                 Applicability::MachineApplicable,

tests/ui/typeck/suggestions/suggest-clone-in-macro-issue-139253.stderr

@@ -27,6 +27,10 @@ LL |     let c: S = dbg!(field);
    |                ^^^^^^^^^^^ expected `S`, found `&S`
    |
    = note: this error originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider using clone here
+   |
+LL |     let c: S = dbg!(field).clone();
+   |                           ++++++++
 
 error[E0308]: mismatched types
   --> $DIR/suggest-clone-in-macro-issue-139253.rs:16:16
@@ -35,6 +39,10 @@ LL |     let c: S = dbg!(dbg!(field));
    |                ^^^^^^^^^^^^^^^^^ expected `S`, found `&S`
    |
    = note: this error originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider using clone here
+   |
+LL |     let c: S = dbg!(dbg!(field)).clone();
+   |                                 ++++++++
 
 error: aborting due to 4 previous errors