IMO, you've loaded some package that is overriding 3 methods.
Hence, the methods are repackaged and appear to be removed from Kernel.

Nicolas

2010/7/28 Casey Ransberger <casey.obrien.r at gmail.com>:
> Not sure what the junk below on the commit diff is; it all looks familiar
> and faintly cog-related though. Do we have the dirty-inbox problem again?
> AFAIK I only touched three comments in this commit.
>
> On Tue, Jul 27, 2010 at 8:47 PM, <commits at source.squeak.org> wrote:
>>
>> A new version of Kernel was added to project The Inbox:
>> http://source.squeak.org/inbox/Kernel-cbr.475.mcz
>>
>> ==================== Summary ====================
>>
>> Name: Kernel-cbr.475
>> Author: cbr
>> Time: 27 July 2010, 8:47:17.817 pm
>> UUID: 31fff092-aa15-4aac-9cff-0edb485a0d25
>> Ancestors: Kernel-eem.474
>>
>> A few of the chronology classes met my current heuristic for "comment is
>> too small," and though the comments were fine as is, I added an example
>> usage to each just for fun.
>>
>> =============== Diff against Kernel-eem.474 ===============
>>
>> Item was changed:
>>  Timespan subclass: #Week
>>        instanceVariableNames: ''
>>        classVariableNames: 'StartDay'
>>        poolDictionaries: 'ChronologyConstants'
>>        category: 'Kernel-Chronology'!
>>
>> + !Week commentStamp: 'cbr 7/27/2010 20:28' prior: 0!
>> + I represent a week.
>> +
>> + To find out what days of the week on which Squeak is fun, select the
>> following expression, and print it:
>> +
>> + Week dayNames!
>> - !Week commentStamp: 'brp 5/13/2003 09:48' prior: 0!
>> - I represent a week.!
>>
>> Item was changed:
>>  Timespan subclass: #Year
>>        instanceVariableNames: ''
>>        classVariableNames: ''
>>        poolDictionaries: ''
>>        category: 'Kernel-Chronology'!
>>
>> + !Year commentStamp: 'cbr 7/27/2010 20:41' prior: 0!
>> + I represent a year.
>> +
>> + Try me!! Select the following expression and print it:
>> +
>> + Year current daysInYear "Try me again next leap year!!"!
>> - !Year commentStamp: 'dtl 7/11/2009 16:35' prior: 0!
>> - I represent a year.!
>>
>> Item was changed:
>>  Timespan subclass: #Month
>>        instanceVariableNames: ''
>>        classVariableNames: ''
>>        poolDictionaries: 'ChronologyConstants'
>>        category: 'Kernel-Chronology'!
>>
>> + !Month commentStamp: 'cbr 7/27/2010 20:34' prior: 0!
>> + I represent a month.
>> +
>> + For example, to get the number of days this month, you can evaluate the
>> following expression:
>> +
>> + Month current daysInMonth!
>> - !Month commentStamp: 'brp 5/13/2003 09:48' prior: 0!
>> - I represent a month.!
>>
>> Item was removed:
>> - ----- Method: Integer>>isPrime (in category 'testing') -----
>> - isPrime
>> -       "Answer true if the receiver is a prime number. See
>> isProbablyPrime for a probabilistic
>> -       implementation that is much faster for large integers, and that is
>> correct to an extremely
>> -       high statistical level of confidence (effectively deterministic)."
>> -
>> -       self <= 1 ifTrue: [ ^false ].
>> -       self even ifTrue: [ ^self = 2].
>> -       3 to: self sqrtFloor by: 2 do: [ :each |
>> -               self \\ each = 0 ifTrue: [ ^false ] ].
>> -       ^true!
>>
>> Item was removed:
>> - ----- Method: Float class>>twoPi (in category 'constants') -----
>> - twoPi
>> -
>> -       ^ Twopi
>> - !
>>
>> Item was removed:
>> - ----- Method: Integer>>isProbablyPrimeWithK:andQ: (in category
>> 'private') -----
>> - isProbablyPrimeWithK: k andQ: q
>> -       "Algorithm P, probabilistic primality test, from
>> -       Knuth, Donald E. 'The Art of Computer Programming', Vol 2,
>> -       Third Edition, section 4.5.4, page 395, P1-P5 refer to Knuth
>> description."
>> -
>> -       "P1"
>> -
>> -       | x j y |
>> -       x := (self - 2) atRandom + 1.
>> -       "P2"
>> -       j := 0.
>> -       y := x raisedToInteger: q modulo: self.
>> -       "P3"
>> -
>> -       [(((j = 0) & (y = 1)) | (y = (self - 1))) ifTrue: [^true].
>> -       ((j > 0) & (y = 1)) ifTrue: [^false].   "P5"
>> -       true]
>> -                       whileTrue:
>> -                               [j := j + 1.
>> -                               (j < k) ifTrue: [y := y squared \\ self]
>> -                               ifFalse:[^ false]]!
>>
>> Item was removed:
>> - ----- Method: Object>>isArray (in category 'testing') -----
>> - isArray
>> -       ^false!
>>
>> Item was removed:
>> - ----- Method: Integer>>raisedToInteger:modulo: (in category
>> 'mathematical functions') -----
>> - raisedToInteger: exp modulo: m
>> -       (exp = 0) ifTrue: [^ 1].
>> -       exp even
>> -               ifTrue: [^ (self raisedToInteger: (exp // 2) modulo: m)
>> squared \\ m]
>> -               ifFalse: [^ (self * (self raisedToInteger: (exp - 1)
>> modulo: m)) \\ m].!
>>
>>
>
>
>
> --
> Casey Ransberger
>
>
>
>