From c9a6a5a9950686145df3295fc26fb6e9c9de13ef Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Sat, 27 Aug 2011 16:10:11 +0200
Subject: [PATCH] Parse single-element tuples.

---
 pymbolic/parser.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pymbolic/parser.py b/pymbolic/parser.py
index f49d6f2..5fc0d81 100644
--- a/pymbolic/parser.py
+++ b/pymbolic/parser.py
@@ -139,6 +139,9 @@ def parse(expr_str):
                 did_something = True
             elif next_tag is _comma and _PREC_COMMA > min_precedence:
                 pstate.advance()
+                if pstate.is_at_end() or pstate.next_tag() is _closepar:
+                    return (left_exp,)
+
                 new_el = parse_expression(pstate, _PREC_COMMA)
                 if isinstance(left_exp, tuple):
                     left_exp = left_exp + (new_el,)
-- 
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