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TIP: 323
Title: Do Nothing Gracefully
Version: $Revision: 1.5 $
Version: $Revision: 1.6 $
Author: Colin McCormack <[email protected]>
Author: Don Porter <[email protected]>
Author: Kevin B. Kenny <[email protected]>
State: Accepted
State: Final
Type: Project
Vote: Done
Created: 06-Aug-2008
Post-History:
Tcl-Version: 8.6
~ Abstract
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1. '''lrepeat''' - accept both ''number'' = 0 and zero elements.
[https://sourceforge.net/support/tracker.php?aid=1671951]
1. '''my variable''' - accept zero variable names.
1. '''namespace upvar''' - accept zero variable names.
1. '''string first''' - able to find empty string.
[https://sourceforge.net/support/tracker.php?aid=1243354]
1. '''string last''' - able to find empty string.
[https://sourceforge.net/support/tracker.php?aid=1243354]
1. '''string replace''' - change interpretation of ''last'' < ''first'' case
to enable replacement of an empty substring anchored at ''first''.
Most of the proposed changes convert errors into no-ops. There should be no
compatibility concerns with those. The exceptions are the proposed changes to
'''string first''', '''string last''', and '''string replace''', where current
behavior is so inexplicable, it would be called a bug if it weren't
documented. Changing those commands is an incompatibility, but likely a
welcome one.
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acceptance over a complete input domain. Not in the spirit of this TIP.
1. '''uplevel'''
1. '''upvar''' - presence of the optional ''level'' argument makes this
one messy.
~ Epilogue
Proposed changes to '''string first''', '''string last''', and
'''string replace''' in earlier revisions of the TIP that were approved
by the vote have been rescinded after testing during the implementation
phase revealed greater than expected issues with the incompatibilities
those changes introduced.
~ Copyright
This document has been placed in the public domain.
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