Don't lex "j" as a complex number.

This fixes #143

hy/lex/states.py

@@ -67,10 +67,11 @@ def _resolve_atom(obj):
     except ValueError:
         pass
 
-    try:
-        return HyComplex(obj)
-    except ValueError:
-        pass
+    if obj != "j":
+        try:
+            return HyComplex(obj)
+        except ValueError:
+            pass
 
     table = {
         "true": "True",

tests/lex/test_lex.py

@@ -230,3 +230,12 @@ def test_hashbang():
     """ Ensure we can escape things """
     entry = tokenize("#!this is a comment\n")
     assert entry == []
+
+
+def test_complex():
+    """Ensure we tokenize complex numbers properly"""
+    # This is a regression test for #143
+    entry = tokenize("(1j)")[0][0]
+    assert entry == HyComplex("1.0j")
+    entry = tokenize("(j)")[0][0]
+    assert entry == HySymbol("j")

tests/native_tests/language.hy

@@ -420,7 +420,8 @@
   (assert (= (sorted (list-comp (* y 2) ((, x y) (.items {"1" 1 "2" 2}))))
              [2 4]))
   (assert (= (list-comp (, x y) (x (range 2) y (range 2)))
-             [(, 0 0) (, 0 1) (, 1 0) (, 1 1)])))
+             [(, 0 0) (, 0 1) (, 1 0) (, 1 1)]))
+  (assert (= (list-comp j (j [1 2])) [1 2])))
 
 
 (defn test-defn-order []