$ ~/swift-DEVELOPMENT-SNAPSHOT-2019-01-24-a-ubuntu18.04/usr/bin/swift
error: ld-2.27.so 0xffffffff0005c564: adding range [0x1464a-0x146ba) which has a base that is less than the function's low PC 0x14dc0. Please file a bug and attach the file at the start of this error message
error: ld-2.27.so 0xffffffff0005c564: adding range [0x146d0-0x146d6) which has a base that is less than the function's low PC 0x14dc0. Please file a bug and attach the file at the start of this error message
error: ld-2.27.so 0xffffffff0005c5c5: adding range [0x1464a-0x146ba) which has a base that is less than the function's low PC 0x14dc0. Please file a bug and attach the file at the start of this error message
error: ld-2.27.so 0xffffffff0005c5c5: adding range [0x146d0-0x146d6) which has a base that is less than the function's low PC 0x14dc0. Please file a bug and attach the file at the start of this error message
Welcome to Swift version 5.0-dev (LLVM f63b283c71, Clang 41ac4c4262, Swift 6875d77d6f).
Type :help for assistance.
  1> import Foundation 
  2. let d = NSDateComponents() 
  3. d.year = 2018 
  4. d.month = 8 
  5. d.day = 1 
  6. print(d.hash) // Traps with overflow error
-2947813404935422364
d: Foundation.NSDateComponents = {
  Foundation.NSObject = {}
  _calendar = nil
  _timeZone = nil
  _values = 19 values {
    [0] = 9223372036854775807
    [1] = 2018
    [2] = 8
    [3] = 1
    [4] = 9223372036854775807
    [5] = 9223372036854775807
    [6] = 9223372036854775807
    [7] = 9223372036854775807
    [8] = 9223372036854775807
    [9] = 9223372036854775807
    [10] = 9223372036854775807
    [11] = 9223372036854775807
    [12] = 9223372036854775807
    [13] = 9223372036854775807
    [14] = 9223372036854775807
    [15] = 9223372036854775807
    [16] = 9223372036854775807
    [17] = 9223372036854775807
    [18] = 9223372036854775807
  }
  timeZone = nil
}
  7>