19779978: Swift 1.2: runtime exception when closed range includes max value for type

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Description

Summary:
When using a closed range in a switch case, and then end of the range is the maximum value for the variable type (e.g.: 0xFF for UInt8, 0xFFFF for UIn16, etc...), the application will crash at runtime when reaching the switch

Steps to Reproduce:
Sample code

let a: UInt8 = 0 // Any number here, doesn't matter
switch a {
case 0xF0...0xFF: // Any start value, doesn't matter
println("a")
default:
break
}

Expected Results:
Switch is executed correctly

Actual Results:
Console output:

fatal error: Range end index has no valid successor

Exception stack:

• thread 22108400: Swift 2.0b4: Allow if let and guard let to assign to self in failable value type initializers #1: tid = 0x29ac1, 0x000000010589e0de libswiftCore.dylib`function signature specialization <Arg[0] = Exploded, Arg[1] = Exploded, Arg[2] = Dead, Arg[3] = Dead> of Swift._fatalErrorMessage (Swift.StaticString, Swift.StaticString, Swift.StaticString, Swift.UInt) -> () + 158, queue = 'com.apple.main-thread', stop reason = EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)
  • frame #0: 0x000000010589e0de libswiftCore.dylibfunction signature specialization <Arg[0] = Exploded, Arg[1] = Exploded, Arg[2] = Dead, Arg[3] = Dead> of Swift._fatalErrorMessage (Swift.StaticString, Swift.StaticString, Swift.StaticString, Swift.UInt) -> () + 158 frame #1: 0x0000000105dfc4d3 $__lldb_expr332main + 1235 at playground332.swift:9
    frame 22108390: Swift 2.0b4: Allow assignment of nil to self in failable initializers to indicate failure #2: 0x0000000105673230 MyPlayground_mh_execute_header + 25136 frame #3: 0x00000001056757f1 MyPlaygroundreabstraction thunk helper from @callee_owned () -> (@unowned ()) to @callee_owned (@in ()) -> (@out ()) + 17
    frame 22108127: Apple Music: CarPlay does not show the For You Playlists #4: 0x0000000105674a51 MyPlaygroundpartial apply forwarder for reabstraction thunk helper from @callee_owned () -> (@unowned ()) to @callee_owned (@in ()) -> (@out ()) + 81 frame #5: 0x0000000105675870 MyPlaygroundreabstraction thunk helper from @callee_owned (@in ()) -> (@out ()) to @callee_owned () -> (@unowned ()) + 32
    frame 22108095: Changing account in Music app requires force-quit #6: 0x00000001056758a7 MyPlaygroundreabstraction thunk helper from @callee_owned () -> (@unowned ()) to @callee_unowned @objc_block () -> (@unowned ()) + 39 frame #7: 0x00007fff8d5992ac CoreFoundationCFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK + 12
    frame 22107434: Providing Generic Generator for protocol intermittently crashes compiler #8: 0x00007fff8d58b3b5 CoreFoundation__CFRunLoopDoBlocks + 341 frame #9: 0x00007fff8d58ab6e CoreFoundation__CFRunLoopRun + 910
    frame 22107245: Xcode 7 beta 4 (7A165t) Interface Builder ignores background color set on UITableView #10: 0x00007fff8d58a598 CoreFoundationCFRunLoopRunSpecific + 296 frame #11: 0x00007fff90b2cc4f HIToolboxRunCurrentEventLoopInMode + 235
    frame 22106516: watchOS 2 Beta 4: Can’t Import CoreText #12: 0x00007fff90b2c8ce HIToolboxReceiveNextEventCommon + 179 frame #13: 0x00007fff90b2c80b HIToolbox_BlockUntilNextEventMatchingListInModeWithFilter + 71
    frame 22105625: Mac OS X 10.11: Battery status alwasy shows "20:00 Remaining" #14: 0x00007fff8c776a91 AppKit_DPSNextEvent + 964 frame #15: 0x00007fff8c776090 AppKit-[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 194
    frame 22103992: Stack implemented with enum causes Abort trap: 6 #16: 0x00007fff8c76bd93 AppKit-[NSApplication run] + 594 frame #17: 0x00000001056735a5 MyPlaygroundmain + 885
    frame 22103156: News app interface sometimes not visible or incorrect #18: 0x00007fff8e5da5c9 libdyld.dylib`start + 1

Product Version: Xcode 6.3 beta1 (6D520o) / Swift 1.2
Created: 2015-02-10T12:07:15.930499
Originated: 2015-10-02T00:00:00
Open Radar Link: http://www.openradar.me/19779978