1 files changed, 4 insertions, 10 deletions
diff --git a/compiler/rustc_hir_analysis/src/lib.rs b/compiler/rustc_hir_analysis/src/lib.rs
index d54e569905f..9a43ca685e3 100644
--- a/compiler/rustc_hir_analysis/src/lib.rs
+++ b/compiler/rustc_hir_analysis/src/lib.rs
@@ -271,16 +271,10 @@ fn check_main_fn_ty(tcx: TyCtxt<'_>, main_def_id: DefId) {
     } else if !main_fn_predicates.predicates.is_empty() {
         // generics may bring in implicit predicates, so we skip this check if generics is present.
         let generics_where_clauses_span = main_fn_where_clauses_span(tcx, main_def_id);
-        let mut diag = struct_span_err!(
-            tcx.sess,
-            generics_where_clauses_span.unwrap_or(main_span),
-            E0646,
-            "`main` function is not allowed to have a `where` clause"
-        );
-        if let Some(generics_where_clauses_span) = generics_where_clauses_span {
-            diag.span_label(generics_where_clauses_span, "`main` cannot have a `where` clause");
-        }
-        diag.emit();
+        tcx.sess.emit_err(errors::WhereClauseOnMain {
+            span: generics_where_clauses_span.unwrap_or(main_span),
+            generics_span: generics_where_clauses_span,
+        });
         error = true;
     }