Move check for error in impl header outside of reporting

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

@@ -402,10 +402,6 @@ fn report_conflicting_impls<'tcx>(
         impl_span: Span,
         err: &mut Diag<'_, G>,
     ) {
-        if (overlap.trait_ref, overlap.self_ty).references_error() {
-            err.downgrade_to_delayed_bug();
-        }
-
         match tcx.span_of_impl(overlap.with_impl) {
             Ok(span) => {
                 err.span_label(span, "first implementation here");
@@ -458,6 +454,11 @@ fn report_conflicting_impls<'tcx>(
         )
     });
 
+    // Don't report overlap errors if the header references error
+    if let Err(err) = (overlap.trait_ref, overlap.self_ty).error_reported() {
+        return Err(err);
+    }
+
     match used_to_be_allowed {
         None => {
             let reported = if overlap.with_impl.is_local()

tests/ui/traits/next-solver/coherence/skip-reporting-if-references-err.rs

@@ -0,0 +1,15 @@
+//@ compile-flags: -Znext-solver
+
+trait ToUnit<'a> {
+    type Unit;
+}
+
+impl<T> ToUnit for *const T {}
+//~^ ERROR implicit elided lifetime not allowed here
+
+trait Overlap<T> {}
+
+impl<T> Overlap<T> for T {}
+impl<T> Overlap<for<'a> fn(<*const T as ToUnit<'a>>::Unit)> for T {}
+
+fn main() {}

tests/ui/traits/next-solver/coherence/skip-reporting-if-references-err.stderr

@@ -0,0 +1,17 @@
+error[E0726]: implicit elided lifetime not allowed here
+  --> $DIR/skip-reporting-if-references-err.rs:7:9
+   |
+LL | impl<T> ToUnit for *const T {}
+   |         ^^^^^^ expected lifetime parameter
+   |
+help: indicate the anonymous lifetime
+   |
+LL | impl<T> ToUnit<'_> for *const T {}
+   |               ++++
+
+WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:14 ~ skip_reporting_if_references_err[c8da]::{impl#2}::'a), "'a")], def_id: DefId(0:5 ~ skip_reporting_if_references_err[c8da]::ToUnit::Unit) }
+WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:14 ~ skip_reporting_if_references_err[c8da]::{impl#2}::'a), "'a")], def_id: DefId(0:5 ~ skip_reporting_if_references_err[c8da]::ToUnit::Unit) }
+WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:14 ~ skip_reporting_if_references_err[c8da]::{impl#2}::'a), "'a")], def_id: DefId(0:5 ~ skip_reporting_if_references_err[c8da]::ToUnit::Unit) }
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0726`.