From 94934b56c900f8241e3f45c81a33087352d90cd9 Mon Sep 17 00:00:00 2001
From: Marcell Vazquez-Chanlatte <mvc@linux.com>
Date: Thu, 20 Apr 2017 20:40:49 -0700
Subject: [PATCH] remove timed until

---
 stl/ast.py    | 4 ++--
 stl/parser.py | 7 +++----
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/stl/ast.py b/stl/ast.py
index 80a8d74..92f4b26 100644
--- a/stl/ast.py
+++ b/stl/ast.py
@@ -139,9 +139,9 @@ class G(ModalOp):
         return hash(repr(self))
 
 
-class Until(namedtuple('ModalOp', ['interval', 'arg1', 'arg2']), AST):
+class Until(namedtuple('ModalOp', ['arg1', 'arg2']), AST):
     def __repr__(self):
-        return f"({self.arg1} U{self.interval} ({self.arg2}))"
+        return f"({self.arg1} U ({self.arg2}))"
     
     def children(self):
         return [self.arg1, self.arg2]
diff --git a/stl/parser.py b/stl/parser.py
index a6f3310..4b8f4b9 100644
--- a/stl/parser.py
+++ b/stl/parser.py
@@ -35,7 +35,7 @@ neg = ("~" / "¬") phi
 
 f = F interval? phi
 g = G interval? phi
-until = paren_phi __ U interval? __ paren_phi
+until = paren_phi __ U __ paren_phi
 
 F = "F" / "◇"
 G = "G" / "□"
@@ -118,9 +118,8 @@ class STLVisitor(NodeVisitor):
     visit_implies = partialmethod(sugar_binop_visitor, op=implies)
 
     def visit_until(self, _, children):
-        phi1, _, _, i, _, phi2 = children
-        i = self.default_interval if not i else i[0]
-        return ast.Until(i, phi1, phi2)
+        phi1, _, _, _, phi2 = children
+        return ast.Until(phi1, phi2)
 
     def visit_id(self, name, _):
         return Symbol(name.text)