Don't create an extra infcx in report_closure_arg_mismatch

Author: compiler-errors

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

@@ -20,7 +20,6 @@ use rustc_hir::def_id::DefId;
 use rustc_hir::intravisit::Visitor;
 use rustc_hir::lang_items::LangItem;
 use rustc_hir::{AsyncGeneratorKind, GeneratorKind, Node};
-use rustc_infer::infer::TyCtxtInferExt;
 use rustc_middle::hir::map;
 use rustc_middle::ty::{
     self, suggest_arbitrary_trait_bound, suggest_constraining_type_param, AdtKind, DefIdTree,
@@ -1633,8 +1632,7 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
         let expected = build_fn_sig_ty(self.tcx, expected);
         let found = build_fn_sig_ty(self.tcx, found);
 
-        let (expected_str, found_str) =
-            self.tcx.infer_ctxt().enter(|infcx| infcx.cmp(expected, found));
+        let (expected_str, found_str) = self.cmp(expected, found);
 
         let signature_kind = format!("{argument_kind} signature");
         err.note_expected_found(&signature_kind, expected_str, &signature_kind, found_str);