diff --git a/poetry/puzzle/provider.py b/poetry/puzzle/provider.py
index 3e5a11917b1..aa68e74b6b8 100755
--- a/poetry/puzzle/provider.py
+++ b/poetry/puzzle/provider.py
@@ -151,6 +151,21 @@ def search_for(self, dependency):  # type: (Dependency) -> List[DependencyPackag
 
         return PackageCollection(dependency, packages)
 
+    def _get_from_deferred_cache(self, dependency): # type (Dependency) -> Optional[Package]
+        if dependency not in self._deferred_cache:
+            return None
+
+        package = self._deferred_cache[dependency]
+        dependency._constraint = package.version
+        dependency._pretty_constraint = package.version.text
+
+        if not dependency._source_reference:
+            dependency._source_reference = package.source_reference
+        if not dependency._source_resolved_reference:
+            dependency._source_resolved_reference = package.source_resolved_reference
+
+        return package
+
     def search_for_vcs(self, dependency):  # type: (VCSDependency) -> List[Package]
         """
         Search for the specifications that match the given VCS dependency.
@@ -158,8 +173,10 @@ def search_for_vcs(self, dependency):  # type: (VCSDependency) -> List[Package]
         Basically, we clone the repository in a temporary directory
         and get the information we need by checking out the specified reference.
         """
-        if dependency in self._deferred_cache:
-            return [self._deferred_cache[dependency]]
+        cached = self._get_from_deferred_cache(dependency)
+        if cached is not None:
+            print("!!!! get from deferred_cache", dependency, "::", self._deferred_cache[dependency])
+            return [cached]
 
         package = self.get_package_from_vcs(
             dependency.vcs,
@@ -181,7 +198,7 @@ def search_for_vcs(self, dependency):  # type: (VCSDependency) -> List[Package]
     @classmethod
     def get_package_from_vcs(
         cls, vcs, url, branch=None, tag=None, rev=None, name=None
-    ):  # type: (str, str, Optional[str], Optional[str]) -> Package
+    ):  # type: (str, str, Optional[str], Optional[str], Optional[str], Optional[str]) -> Package
         if vcs != "git":
             raise ValueError("Unsupported VCS dependency {}".format(vcs))
 
@@ -213,8 +230,9 @@ def get_package_from_vcs(
         return package
 
     def search_for_file(self, dependency):  # type: (FileDependency) -> List[Package]
-        if dependency in self._deferred_cache:
-            dependency, _package = self._deferred_cache[dependency]
+        cached = self._get_from_deferred_cache(dependency)
+        if cached is not None:
+            dependency, _package = cached
 
             package = _package.clone()
         else:
@@ -258,8 +276,9 @@ def get_package_from_file(cls, file_path):  # type: (Path) -> Package
     def search_for_directory(
         self, dependency
     ):  # type: (DirectoryDependency) -> List[Package]
-        if dependency in self._deferred_cache:
-            dependency, _package = self._deferred_cache[dependency]
+        cached = self._get_from_deferred_cache(dependency)
+        if cached is not None:
+            dependency, _package = cached
 
             package = _package.clone()
         else:
@@ -298,8 +317,9 @@ def get_package_from_directory(
         return package
 
     def search_for_url(self, dependency):  # type: (URLDependency) -> List[Package]
-        if dependency in self._deferred_cache:
-            return [self._deferred_cache[dependency]]
+        cached = self._get_from_deferred_cache(dependency)
+        if cached is not None:
+            return [cached]
 
         package = self.get_package_from_url(dependency.url)
 
diff --git a/poetry/repositories/base_repository.py b/poetry/repositories/base_repository.py
index 46422ca0edc..aaf87a5d387 100644
--- a/poetry/repositories/base_repository.py
+++ b/poetry/repositories/base_repository.py
@@ -1,15 +1,20 @@
+from typing import List
+from typing import Optional
+
+from poetry.core.packages.package import Package
+
 class BaseRepository(object):
     def __init__(self):
-        self._packages = []
+        self._packages = [] # type: List[Package]
 
     @property
-    def packages(self):
+    def packages(self): # type: () -> List[Package]
         return self._packages
 
     def has_package(self, package):
         raise NotImplementedError()
 
-    def package(self, name, version, extras=None):
+    def package(self, name, version, extras=None): # type: (str, str, Optional[List[str]]) -> Package
         raise NotImplementedError()
 
     def find_packages(self, dependency):
diff --git a/poetry/repositories/repository.py b/poetry/repositories/repository.py
index 1ebe702bb9c..c781c85ac16 100755
--- a/poetry/repositories/repository.py
+++ b/poetry/repositories/repository.py
@@ -1,6 +1,10 @@
+from typing import List
+from typing import Optional
+
 from poetry.core.semver import VersionConstraint
 from poetry.core.semver import VersionRange
 from poetry.core.semver import parse_constraint
+from poetry.core.packages.package import Package
 
 from .base_repository import BaseRepository
 
@@ -21,7 +25,7 @@ def __init__(self, packages=None, name=None):
     def name(self):
         return self._name
 
-    def package(self, name, version, extras=None):
+    def package(self, name, version, extras=None): # type: (str, str, Optional[List[str]]) -> Package
         name = name.lower()
 
         for package in self.packages: