make error_reported check for delayed bugs

compiler/rustc_errors/src/lib.rs

@@ -1044,13 +1044,24 @@ impl Handler {
     }
     pub fn has_errors_or_lint_errors(&self) -> Option<ErrorGuaranteed> {
         if self.inner.borrow().has_errors_or_lint_errors() {
-            Some(ErrorGuaranteed(()))
+            Some(ErrorGuaranteed::unchecked_claim_error_was_emitted())
+        } else {
+            None
+        }
+    }
+    pub fn has_errors_or_delayed_span_bugs(&self) -> Option<ErrorGuaranteed> {
+        if self.inner.borrow().has_errors_or_delayed_span_bugs() {
+            Some(ErrorGuaranteed::unchecked_claim_error_was_emitted())
         } else {
             None
         }
     }
-    pub fn has_errors_or_delayed_span_bugs(&self) -> bool {
-        self.inner.borrow().has_errors_or_delayed_span_bugs()
+    pub fn is_compilation_going_to_fail(&self) -> Option<ErrorGuaranteed> {
+        if self.inner.borrow().is_compilation_going_to_fail() {
+            Some(ErrorGuaranteed::unchecked_claim_error_was_emitted())
+        } else {
+            None
+        }
     }
 
     pub fn print_error_count(&self, registry: &Registry) {
@@ -1484,6 +1495,10 @@ impl HandlerInner {
         self.err_count() > 0 || self.lint_err_count > 0 || self.warn_count > 0
     }
 
+    fn is_compilation_going_to_fail(&self) -> bool {
+        self.has_errors() || self.lint_err_count > 0 || !self.delayed_span_bugs.is_empty()
+    }
+
     fn abort_if_errors(&mut self) {
         self.emit_stashed_diagnostics();
 

compiler/rustc_incremental/src/persist/fs.rs

@@ -322,7 +322,7 @@ pub fn finalize_session_directory(sess: &Session, svh: Svh) {
 
     let incr_comp_session_dir: PathBuf = sess.incr_comp_session_dir().clone();
 
-    if sess.has_errors_or_delayed_span_bugs() {
+    if let Some(_) = sess.has_errors_or_delayed_span_bugs() {
         // If there have been any errors during compilation, we don't want to
         // publish this session directory. Rather, we'll just delete it.
 

compiler/rustc_incremental/src/persist/save.rs

@@ -28,7 +28,7 @@ pub fn save_dep_graph(tcx: TyCtxt<'_>) {
             return;
         }
         // This is going to be deleted in finalize_session_directory, so let's not create it
-        if sess.has_errors_or_delayed_span_bugs() {
+        if let Some(_) = sess.has_errors_or_delayed_span_bugs() {
             return;
         }
 
@@ -89,7 +89,7 @@ pub fn save_work_product_index(
         return;
     }
     // This is going to be deleted in finalize_session_directory, so let's not create it
-    if sess.has_errors_or_delayed_span_bugs() {
+    if let Some(_) = sess.has_errors_or_delayed_span_bugs() {
         return;
     }
 

compiler/rustc_middle/src/ty/visit.rs

@@ -97,10 +97,10 @@ pub trait TypeVisitable<'tcx>: fmt::Debug + Clone {
     }
     fn error_reported(&self) -> Result<(), ErrorGuaranteed> {
         if self.references_error() {
-            if let Some(reported) = ty::tls::with(|tcx| tcx.sess.has_errors()) {
+            if let Some(reported) = ty::tls::with(|tcx| tcx.sess.is_compilation_going_to_fail()) {
                 Err(reported)
             } else {
-                bug!("expect tcx.sess.has_errors return true");
+                bug!("expect tcx.sess.is_compilation_going_to_fail return `Some`");
             }
         } else {
             Ok(())

compiler/rustc_query_system/src/dep_graph/graph.rs

@@ -667,7 +667,7 @@ impl<K: DepKind> DepGraph<K> {
             None => {}
         }
 
-        if !qcx.dep_context().sess().has_errors_or_delayed_span_bugs() {
+        if let None = qcx.dep_context().sess().has_errors_or_delayed_span_bugs() {
             panic!("try_mark_previous_green() - Forcing the DepNode should have set its color")
         }
 

compiler/rustc_session/src/session.rs

@@ -538,9 +538,12 @@ impl Session {
     pub fn has_errors(&self) -> Option<ErrorGuaranteed> {
         self.diagnostic().has_errors()
     }
-    pub fn has_errors_or_delayed_span_bugs(&self) -> bool {
+    pub fn has_errors_or_delayed_span_bugs(&self) -> Option<ErrorGuaranteed> {
         self.diagnostic().has_errors_or_delayed_span_bugs()
     }
+    pub fn is_compilation_going_to_fail(&self) -> Option<ErrorGuaranteed> {
+        self.diagnostic().is_compilation_going_to_fail()
+    }
     pub fn abort_if_errors(&self) {
         self.diagnostic().abort_if_errors();
     }

src/test/ui/consts/issue-104768.rs

@@ -0,0 +1,4 @@
+const A: &_ = 0_u32;
+//~^ ERROR: the placeholder `_` is not allowed within types on item signatures for constants
+
+fn main() {}

src/test/ui/consts/issue-104768.stderr

@@ -0,0 +1,12 @@
+error[E0121]: the placeholder `_` is not allowed within types on item signatures for constants
+  --> $DIR/issue-104768.rs:1:10
+   |
+LL | const A: &_ = 0_u32;
+   |          ^^
+   |          |
+   |          not allowed in type signatures
+   |          help: replace with the correct type: `u32`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0121`.