the linearizer API now allows to detect metavariables. This is used for instancein the lookup where the tokens produced from the metavariables are interpreted as distinct from all other tokens.

src/runtime/dotNet/Bracket.cs

@@ -52,7 +52,8 @@ namespace PGFSharp
 					end_phrase = EndPhrase,
 					symbol_ne = null,
 					symbol_bind = null,
-					symbol_capit = null
+					symbol_capit = null,
+					symbol_meta = SymbolMeta
 				};
 			}
 
@@ -80,6 +81,10 @@ namespace PGFSharp
 				else 
 					stack.Peek ().AddChild (b);
 			}
+			
+			private void SymbolMeta(IntPtr self, int meta_id) {
+				stack.Peek().AddChild(new StringChildBracket("?"));
+			}
 
 			public Bracket Build() {
 				return final;