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/c/pgf/linearizer.h

@@ -33,6 +33,8 @@ typedef struct {
 } PgfCncTreeApp;
 
 typedef struct {
+	PgfMetaId id;
+
 	size_t n_vars;
 	PgfPrintContext* context;
 
@@ -94,6 +96,9 @@ struct PgfLinFuncs
 
 	/// capitalization
 	void (*symbol_capit)(PgfLinFuncs** self, PgfCapitState capit);
+	
+	/// meta variable
+	void (*symbol_meta)(PgfLinFuncs** self, PgfMetaId id);
 };
 
 /// Linearize a concrete syntax tree.