Separate AnonConst from ConstBlock in HIR.

compiler/rustc_passes/src/check_const.rs

@@ -199,6 +199,11 @@ impl<'tcx> Visitor<'tcx> for CheckConstVisitor<'tcx> {
         self.recurse_into(kind, None, |this| intravisit::walk_anon_const(this, anon));
     }
 
+    fn visit_inline_const(&mut self, block: &'tcx hir::ConstBlock) {
+        let kind = Some(hir::ConstContext::Const);
+        self.recurse_into(kind, None, |this| intravisit::walk_inline_const(this, block));
+    }
+
     fn visit_body(&mut self, body: &'tcx hir::Body<'tcx>) {
         let owner = self.tcx.hir().body_owner_def_id(body.id());
         let kind = self.tcx.hir().body_const_context(owner);

compiler/rustc_passes/src/dead.rs

@@ -500,6 +500,17 @@ impl<'tcx> Visitor<'tcx> for MarkSymbolVisitor<'tcx> {
 
         self.in_pat = in_pat;
     }
+
+    fn visit_inline_const(&mut self, c: &'tcx hir::ConstBlock) {
+        // When inline const blocks are used in pattern position, paths
+        // referenced by it should be considered as used.
+        let in_pat = mem::replace(&mut self.in_pat, false);
+
+        self.live_symbols.insert(c.def_id);
+        intravisit::walk_inline_const(self, c);
+
+        self.in_pat = in_pat;
+    }
 }
 
 fn has_allow_dead_code_or_lang_attr(tcx: TyCtxt<'_>, def_id: LocalDefId) -> bool {

compiler/rustc_passes/src/loops.rs

@@ -24,7 +24,7 @@ enum Context {
     Closure(Span),
     AsyncClosure(Span),
     LabeledBlock,
-    AnonConst,
+    Constant,
 }
 
 #[derive(Copy, Clone)]
@@ -53,7 +53,11 @@ impl<'a, 'hir> Visitor<'hir> for CheckLoopVisitor<'a, 'hir> {
     }
 
     fn visit_anon_const(&mut self, c: &'hir hir::AnonConst) {
-        self.with_context(AnonConst, |v| intravisit::walk_anon_const(v, c));
+        self.with_context(Constant, |v| intravisit::walk_anon_const(v, c));
+    }
+
+    fn visit_inline_const(&mut self, c: &'hir hir::ConstBlock) {
+        self.with_context(Constant, |v| intravisit::walk_inline_const(v, c));
     }
 
     fn visit_expr(&mut self, e: &'hir hir::Expr<'hir>) {
@@ -192,7 +196,7 @@ impl<'a, 'hir> CheckLoopVisitor<'a, 'hir> {
             AsyncClosure(closure_span) => {
                 self.sess.emit_err(BreakInsideAsyncBlock { span, closure_span, name });
             }
-            Normal | AnonConst => {
+            Normal | Constant => {
                 self.sess.emit_err(OutsideLoop { span, name, is_break: name == "break" });
             }
         }