1 files changed, 19 insertions, 0 deletions
diff --git a/python/src/com/jetbrains/python/codeInsight/stdlib/PyStdlibTypeProvider.java b/python/src/com/jetbrains/python/codeInsight/stdlib/PyStdlibTypeProvider.java
index 346d40f3273e..c28bc29455c9 100644
--- a/python/src/com/jetbrains/python/codeInsight/stdlib/PyStdlibTypeProvider.java
+++ b/python/src/com/jetbrains/python/codeInsight/stdlib/PyStdlibTypeProvider.java
@@ -36,6 +36,8 @@ import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
+import static com.jetbrains.python.psi.PyUtil.as;
+
 /**
  * @author yole
  */
@@ -132,6 +134,23 @@ public class PyStdlibTypeProvider extends PyTypeProviderBase {
           }
         }
       }
+      else if ("__builtin__.tuple.__add__".equals(qname) && callSite instanceof PyBinaryExpression) {
+        final PyBinaryExpression expression = (PyBinaryExpression)callSite;
+        final PyTupleType leftTupleType = as(context.getType(expression.getLeftExpression()), PyTupleType.class);
+        if (expression.getRightExpression() != null) {
+          final PyTupleType rightTupleType = as(context.getType(expression.getRightExpression()), PyTupleType.class);
+          if (leftTupleType != null && rightTupleType != null) {
+            final PyType[] elementTypes = new PyType[leftTupleType.getElementCount() + rightTupleType.getElementCount()];
+            for (int i = 0; i < leftTupleType.getElementCount(); i++) {
+              elementTypes[i] = leftTupleType.getElementType(i);
+            }
+            for (int i = 0; i < rightTupleType.getElementCount(); i++) {
+              elementTypes[i + leftTupleType.getElementCount()] = rightTupleType.getElementType(i);
+            }
+            return PyTupleType.create(function, elementTypes);
+          }
+        }
+      }
     }
     return null;
   }