code review 2144043: fmt.Scan: fix integer overflow on 32-bit machines

src/pkg/fmt/scan_test.go

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 package fmt_test
 
 import (
         . "fmt"
         "io"
         "os"
@@ skipping 165 matching lines @@
         ScanTest{"109\n", &renamedUint8Val, renamedUint8(109)},
         ScanTest{"110\n", &renamedUint16Val, renamedUint16(110)},
         ScanTest{"111\n", &renamedUint32Val, renamedUint32(111)},
         ScanTest{"112\n", &renamedUint64Val, renamedUint64(112)},
         ScanTest{"113\n", &renamedUintptrVal, renamedUintptr(113)},
         ScanTest{"114\n", &renamedStringVal, renamedString("114")},
         ScanTest{"115\n", &renamedBytesVal, renamedBytes([]byte("115"))},
 
         // Custom scanner.
         ScanTest{"  vvv ", &xVal, Xs("vvv")},
+
+        // Fixed bugs
+        ScanTest{"2147483648\n", &int64Val, int64(2147483648)}, // was: integer overflow
 }
 
 var scanfTests = []ScanfTest{
         ScanfTest{"%v", "TRUE\n", &boolVal, true},
         ScanfTest{"%t", "false\n", &boolVal, false},
         ScanfTest{"%v", "-71\n", &intVal, -71},
         ScanfTest{"%d", "72\n", &intVal, 72},
         ScanfTest{"%c", "a\n", &intVal, 'a'},
         ScanfTest{"%c", "\u5072\n", &intVal, 0x5072},
         ScanfTest{"%c", "\u1234\n", &intVal, '\u1234'},
@@ skipping 376 matching lines @@
         if err == nil {
                 t.Error("expected error scanning empty string")
         }
         if n != 0 {
                 t.Error("expected to scan zero items, got", n)
         }
         if ec.eofCount != 1 {
                 t.Error("expected one EOF, got", ec.eofCount)
         }
 }