Fix check for _ as an allowed member name, closes #851

Author: hsutter

regression-tests/test-results/version

@@ -1,5 +1,5 @@
 
-cppfront compiler v0.3.0   Build 8C28:1634
+cppfront compiler v0.3.0   Build 9104:1031
 Copyright(c) Herb Sutter   All rights reserved
 
 SPDX-License-Identifier: CC-BY-NC-ND-4.0

source/build.info

@@ -1 +1 @@
-"8C28:1634"
+"9104:1031"

source/reflect.h

@@ -1871,7 +1871,7 @@ auto print(cpp2::in<meta::type_declaration> t) -> void
     for ( 
           auto const& m : CPP2_UFCS(get_members)(rtype) ) 
     {
-        CPP2_UFCS(require)(m, !(CPP2_UFCS(starts_with)(CPP2_UFCS(name)(m), "_")) || cpp2::cmp_greater(CPP2_UFCS(ssize)(CPP2_UFCS(name)(m)),1), 
+        CPP2_UFCS(require)(m, !(CPP2_UFCS(starts_with)(CPP2_UFCS(name)(m), "_")) || CPP2_UFCS(ssize)(CPP2_UFCS(name)(m)) == 1, 
                     "a type that applies a metafunction cannot have a body that declares a name that starts with '_' - those names are reserved for the metafunction implementation");
     }
 

source/reflect.h2

@@ -1355,7 +1355,7 @@ apply_metafunctions: (
     for  rtype.get_members()
     do   (m)
     {
-        m.require( !m.name().starts_with("_") || m.name().ssize() > 1,
+        m.require( !m.name().starts_with("_") || m.name().ssize() == 1,
                     "a type that applies a metafunction cannot have a body that declares a name that starts with '_' - those names are reserved for the metafunction implementation");
     }