Make pretty-print emit metafunctions as comment, updates #840

And update a few stray regression test results post-merges

Author: hsutter

regression-tests/test-results/pure2-print.cpp2.output

@@ -1,6 +1,6 @@
 pure2-print.cpp2...
 
-outer: type = 
+outer:/* @print */ type = 
 {
     object_alias: <T: type> T requires (true) == 42;
     mytype: final type = 

regression-tests/test-results/version

@@ -1,5 +1,5 @@
 
-cppfront compiler v0.3.0   Build 8C20:1314
+cppfront compiler v0.3.0   Build 8C28:1634
 Copyright(c) Herb Sutter   All rights reserved
 
 SPDX-License-Identifier: CC-BY-NC-ND-4.0

source/build.info

@@ -1 +1 @@
-"8C20:1314"
+"8C28:1634"

source/parse.h

@@ -4961,15 +4961,19 @@ auto pretty_print_visualize(declaration_node const& n, int indent, bool include_
     //  First compute the common parts
 
     auto metafunctions = std::string{};
-    for (auto& meta : n.metafunctions)
     {
-        if (
-            include_metafunctions_list
-            || meta->to_string() == "struct"
-            )
-        {
-            metafunctions += " @" + pretty_print_visualize(*meta, indent);
-        }
+    auto as_comment = 
+        !n.metafunctions.empty()
+        && !include_metafunctions_list;
+    if (as_comment) {
+        metafunctions += "/*";
+    }
+    for (auto& meta : n.metafunctions) {
+        metafunctions += " @" + pretty_print_visualize(*meta, indent);
+    }
+    if (as_comment) {
+        metafunctions += " */";
+    }
     }
 
     auto template_params = std::string{};