diff --git a/stl/boolean_eval.py b/stl/boolean_eval.py
index 32dd19f..09f1243 100644
--- a/stl/boolean_eval.py
+++ b/stl/boolean_eval.py
@@ -177,16 +177,6 @@ def eval_stl_ap(phi, _):
     return _eval
 
 
-@eval_stl.register(stl.LinEq)
-def eval_stl_lineq(phi, _):
-    def _eval(x):
-        out = x[phi]
-        out.compact()
-        return out
-
-    return _eval
-
-
 @eval_stl.register(type(stl.TOP))
 def eval_stl_top(_, _1):
     return lambda *_: TRUE_TRACE
diff --git a/stl/fastboolean_eval.py b/stl/fastboolean_eval.py
index 455e3cb..a135b3a 100644
--- a/stl/fastboolean_eval.py
+++ b/stl/fastboolean_eval.py
@@ -1,15 +1,14 @@
-import operator as op
 from functools import reduce, singledispatch
 from operator import and_, or_
 
 import funcy as fn
 from bitarray import bitarray
-from lenses import bind
 
 import stl.ast
 
 oo = float('inf')
 
+
 def get_times(x, tau, lo, hi):
     end = min(v.domain.end() for v in x.values())
 
diff --git a/stl/parser.py b/stl/parser.py
index 08909e3..8bec950 100644
--- a/stl/parser.py
+++ b/stl/parser.py
@@ -1,18 +1,14 @@
 # -*- coding: utf-8 -*-
-
-# TODO: allow multiplication to be distributive
-# TODO: support variables on both sides of ineq
 import operator as op
 from functools import partialmethod, reduce
 
-from lenses import bind
 from parsimonious import Grammar, NodeVisitor
 from stl import ast
 from stl.utils import iff, implies, xor, timed_until
 
 STL_GRAMMAR = Grammar(u'''
 phi = (neg / paren_phi / next / bot / top
-     / xor_outer / iff_outer / implies_outer / and_outer / or_outer 
+     / xor_outer / iff_outer / implies_outer / and_outer / or_outer
      / timed_until / until / g / f / AP)
 
 paren_phi = "(" __ phi __ ")"
diff --git a/stl/test_ast.py b/stl/test_ast.py
index c6d5ea4..1db9dc4 100644
--- a/stl/test_ast.py
+++ b/stl/test_ast.py
@@ -24,6 +24,7 @@ def test_identities(phi):
     assert (phi | phi) | phi == phi | (phi | phi)
     assert ~~phi == phi
 
+
 def test_walk():
     phi = stl.parse(
         '(([ ][0, 1] ap1 & < >[1,2] ap2) | (@ap1 U ap2))')