Gate const closures even when they appear in macros

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -422,14 +422,6 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
             ast::ExprKind::TryBlock(_) => {
                 gate_feature_post!(&self, try_blocks, e.span, "`try` expression is experimental");
             }
-            ast::ExprKind::Closure(box ast::Closure { constness: ast::Const::Yes(_), .. }) => {
-                gate_feature_post!(
-                    &self,
-                    const_closures,
-                    e.span,
-                    "const closures are experimental"
-                );
-            }
             _ => {}
         }
         visit::walk_expr(self, e)
@@ -592,6 +584,7 @@ pub fn check_crate(krate: &ast::Crate, sess: &Session) {
     gate_all!(associated_const_equality, "associated const equality is incomplete");
     gate_all!(yeet_expr, "`do yeet` expression is experimental");
     gate_all!(dyn_star, "`dyn*` trait objects are experimental");
+    gate_all!(const_closures, "const closures are experimental");
 
     // All uses of `gate_all!` below this point were added in #65742,
     // and subsequently disabled (with the non-early gating readded).