Add ast::ExprKind::Dummy

compiler/rustc_builtin_macros/src/assert/context.rs

@@ -303,6 +303,7 @@ impl<'cx, 'a> Context<'cx, 'a> {
             | ExprKind::Closure(_)
             | ExprKind::ConstBlock(_)
             | ExprKind::Continue(_)
+            | ExprKind::Dummy
             | ExprKind::Err
             | ExprKind::Field(_, _)
             | ExprKind::ForLoop { .. }

compiler/rustc_builtin_macros/src/concat.rs

@@ -68,6 +68,7 @@ pub fn expand_concat(
             ast::ExprKind::Err => {
                 has_errors = true;
             }
+            ast::ExprKind::Dummy => cx.dcx().span_bug(e.span, "concatenating `ExprKind::Dummy`"),
             _ => {
                 missing_literal.push(e.span);
             }

compiler/rustc_builtin_macros/src/concat_bytes.rs

@@ -176,6 +176,7 @@ pub fn expand_concat_bytes(
             ast::ExprKind::Err => {
                 has_errors = true;
             }
+            ast::ExprKind::Dummy => cx.dcx().span_bug(e.span, "concatenating `ExprKind::Dummy`"),
             _ => {
                 missing_literals.push(e.span);
             }