Fix some assertion errors

Src/IronPython.Modules/select.cs

@@ -1,24 +1,20 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the Apache 2.0 License.
 // See the LICENSE file in the project root for more information.
+
 #if FEATURE_SYNC_SOCKETS
 
 using System;
 using System.Collections;
 using System.Collections.Generic;
-using System.Runtime.InteropServices;
-using Microsoft.Scripting;
+using System.Net.Sockets;
 
 using IronPython.Runtime;
 using IronPython.Runtime.Exceptions;
 using IronPython.Runtime.Operations;
 using IronPython.Runtime.Types;
 
 using Microsoft.Scripting.Runtime;
-using System.Runtime.CompilerServices;
-using Microsoft.Scripting.Utils;
-
-using System.Net.Sockets;
 
 [assembly: PythonModule("select", typeof(IronPython.Modules.PythonSelect))]
 namespace IronPython.Modules {
@@ -67,9 +63,9 @@ public static PythonTuple select(CodeContext/*!*/ context, object iwtd, object o
             try {
                 Socket.Select(readerList, writerList, errorList, timeoutMicroseconds);
             } catch (ArgumentNullException) {
-                throw MakeException(context, SocketExceptionToTuple(new SocketException((int)SocketError.InvalidArgument)));
+                throw PythonSocket.MakeException(context, new SocketException((int)SocketError.InvalidArgument));
             } catch (SocketException e) {
-                throw MakeException(context, SocketExceptionToTuple(e));
+                throw PythonSocket.MakeException(context, e);
             }
 
             // Convert back to what the user originally passed in
@@ -80,14 +76,6 @@ public static PythonTuple select(CodeContext/*!*/ context, object iwtd, object o
             return PythonTuple.MakeTuple(readerList, writerList, errorList);
         }
 
-        private static PythonTuple SocketExceptionToTuple(SocketException e) {
-            return PythonTuple.MakeTuple(e.ErrorCode, e.Message);
-        }
-
-        private static Exception MakeException(CodeContext/*!*/ context, object value) {
-            return PythonExceptions.CreateThrowable((PythonType)context.LanguageContext.GetModuleState("selecterror"), value);
-        }
-
         /// <summary>
         /// Process a sequence of objects that are compatible with ObjectToSocket(). Return two
         /// things as out params: an in-order List of sockets that correspond to the original
@@ -137,8 +125,7 @@ private static Socket ObjectToSocket(CodeContext context, object obj) {
             }
             socket = PythonSocket.socket.HandleToSocket(handle);
             if (socket == null) {
-                SocketException e = new SocketException((int)SocketError.NotSocket);
-                throw PythonExceptions.CreateThrowable((PythonType)context.LanguageContext.GetModuleState("selecterror"), PythonTuple.MakeTuple(e.ErrorCode, e.Message));
+                throw PythonSocket.MakeException(context, new SocketException((int)SocketError.NotSocket));
             }
             return socket;
         }

Src/IronPython/Runtime/Operations/IntOps.cs

@@ -288,7 +288,7 @@ public static string __format__(CodeContext/*!*/ context, int self, [NotNone] st
                     throw PythonOps.ValueError("Unknown format code '{0}' for object of type 'int'", spec.TypeRepr);
             }
 
-            Debug.Assert(digits[0] != '-');
+            Debug.Assert(spec.Type == 'c' || digits[0] != '-');
 
             return spec.AlignNumericText(digits, self == 0, self > 0);
         }

Tests/test_regressions.py

@@ -1683,4 +1683,18 @@ def d01(a=1): pass
             exec('def f(' + ','.join('a{0}'.format(i) for i in range(size)) + '): pass', d)
             d["f"](*range(size)) # just make sure this runs successfully
 
+    def test_ipy3_gh1614(self):
+        # https://github.com/IronLanguages/ironpython3/issues/1614
+
+        # this was causing an assertion error in DEBUG builds
+        self.assertEqual('{:c}'.format(0x2d), '-')
+
+    def test_ipy3_gh1615(self):
+        # https://github.com/IronLanguages/ironpython3/issues/1615
+
+        # this was causing an assertion error in DEBUG builds
+        import select
+        with self.assertRaises(OSError):
+            select.select([], [], [])
+
 run_test(__name__)