a major refactoring in the C and the Haskell runtimes. Note incompatible change in the PGF format!!!

The following are the outcomes:

   - Predef.nonExist is fully supported by both the Haskell and the C runtimes

   - Predef.BIND is now an internal compiler defined token. For now
     it behaves just as usual for the Haskell runtime, i.e. it generates &+.
     However, the special treatment will let us to handle it properly in 
     the C runtime.

   - This required a major change in the PGF format since both 
     nonExist and BIND may appear inside 'pre' and this was not supported
     before.

1 files changed, 5 insertions, 9 deletions

diff --git a/src/runtime/python/pypgf.c b/src/runtime/python/pypgf.c
index 27655166b..b5ff53af0 100644
--- a/src/runtime/python/pypgf.c
+++ b/src/runtime/python/pypgf.c
@@ -1518,17 +1518,13 @@ typedef struct {
 } PgfBracketLznState;
 
 static void
-pgf_bracket_lzn_symbol_tokens(PgfLinFuncs** funcs, PgfTokens* toks)
+pgf_bracket_lzn_symbol_token(PgfLinFuncs** funcs, PgfToken tok)
 {
 	PgfBracketLznState* state = gu_container(funcs, PgfBracketLznState, funcs);
 
-	size_t len = gu_seq_length(toks);
-	for (size_t i = 0; i < len; i++) {
-		PgfToken tok = gu_seq_get(toks, PgfToken, i);
-		PyObject* str = gu2py_string(tok);
-		PyList_Append(state->list, str);
-		Py_DECREF(str);
-	}
+	PyObject* str = gu2py_string(tok);
+	PyList_Append(state->list, str);
+	Py_DECREF(str);
 }
 
 static void
@@ -1600,7 +1596,7 @@ pgf_bracket_lzn_end_phrase(PgfLinFuncs** funcs, PgfCId cat, int fid, int lindex,
 }
 
 static PgfLinFuncs pgf_bracket_lin_funcs = {
-	.symbol_tokens = pgf_bracket_lzn_symbol_tokens,
+	.symbol_token  = pgf_bracket_lzn_symbol_token,
 	.expr_literal  = pgf_bracket_lzn_expr_literal,
 	.begin_phrase  = pgf_bracket_lzn_begin_phrase,
 	.end_phrase    = pgf_bracket_lzn_end_phrase