diff --git a/spacy/tests/regression/test_issue1539.py b/spacy/tests/regression/test_issue1539.py
new file mode 100644
index 000000000..6665f8087
--- /dev/null
+++ b/spacy/tests/regression/test_issue1539.py
@@ -0,0 +1,10 @@
+'''Ensure vectors.resize() doesn't try to modify dictionary during iteration.'''
+from __future__ import unicode_literals
+
+from ...vectors import Vectors
+
+
+def test_issue1539():
+    v = Vectors(shape=(10, 10), keys=[5,3,98,100])
+    v.resize((100,100))
+
diff --git a/spacy/tokens/span.pyx b/spacy/tokens/span.pyx
index f09dfd134..10b8a7820 100644
--- a/spacy/tokens/span.pyx
+++ b/spacy/tokens/span.pyx
@@ -261,6 +261,11 @@ cdef class Span:
             self.start = start
             self.end = end + 1
 
+    property vocab:
+        """RETURNS (Vocab): The Span's Doc's vocab."""
+        def __get__(self):
+            return self.doc.vocab
+
     property sent:
         """RETURNS (Span): The sentence span that the span is a part of."""
         def __get__(self):
diff --git a/spacy/tokens/token.pyx b/spacy/tokens/token.pyx
index c0ff8c845..281c0a4be 100644
--- a/spacy/tokens/token.pyx
+++ b/spacy/tokens/token.pyx
@@ -341,19 +341,20 @@ cdef class Token:
 
     property sent_start:
         def __get__(self):
-            util.deprecated(
-                "Token.sent_start is now deprecated. Use Token.is_sent_start "
-                "instead, which returns a boolean value or None if the answer "
-                "is unknown – instead of a misleading 0 for False and 1 for "
-                "True. It also fixes a quirk in the old logic that would "
-                "always set the property to 0 for the first word of the "
-                "document.")
+            # Raising a deprecation warning causes errors for autocomplete
+            #util.deprecated(
+            #    "Token.sent_start is now deprecated. Use Token.is_sent_start "
+            #    "instead, which returns a boolean value or None if the answer "
+            #    "is unknown – instead of a misleading 0 for False and 1 for "
+            #    "True. It also fixes a quirk in the old logic that would "
+            #    "always set the property to 0 for the first word of the "
+            #    "document.")
             # Handle broken backwards compatibility case: doc[0].sent_start
             # was False.
             if self.i == 0:
                 return False
             else:
-                return self.sent_start
+                return self.c.sent_start
 
         def __set__(self, value):
             self.is_sent_start = value
diff --git a/spacy/vectors.pyx b/spacy/vectors.pyx
index 46997cccf..96a9d3435 100644
--- a/spacy/vectors.pyx
+++ b/spacy/vectors.pyx
@@ -151,7 +151,7 @@ cdef class Vectors:
         filled = {row for row in self.key2row.values()}
         self._unset = {row for row in range(shape[0]) if row not in filled}
         removed_items = []
-        for key, row in self.key2row.items():
+        for key, row in list(self.key2row.items()):
             if row >= shape[0]:
                 self.key2row.pop(key)
                 removed_items.append((key, row))