The Tcl Core Team is pleased to announce the 8.6a3 releases of the Tcl
dynamic language and the Tk toolkit.  This is the third alpha release
of Tcl/Tk 8.6.  More details can be found below.  We would like to
express our gratitude to all those who submit bug reports and patches.
This information is invaluable in enabling us to identify and eliminate
problems in the core.

Where to get the new releases:
------------------------------

Tcl/Tk 8.6a3 sources are freely available as open source from the
Tcl Developer Xchange web site at:

          http://www.tcl.tk/software/tcltk/8.6.html

This web page also contains additional information about the releases,
including new features and notes about installing and compiling the
releases.  Sources are always available from the Tcl SourceForge
project's file distribution area:

          http://sourceforge.net/project/showfiles.php?group_id=10894

Binaries for most major platforms are available from:

          http://www.activestate.com/Tcl

For additional information:
---------------------------

Please visit the Tcl Developer Xchange web site:

          http://www.tcl.tk/

This site contains a variety of information about Tcl/Tk in general, the
core Tcl and Tk distributions, Tcl development tools, and much more.

Summary of Changes since Tcl/Tk 8.6a2:
--------------------------------------

The following were the main changes in Tcl/Tk 8.6a3.  A complete list
can be found in the changes file at the root of the source tree.  The
more complete ChangeLog is also included with each source release.

This release is the third alpha release of 8.6.  The alpha moniker means
that it is in feature addition mode.  All bug fixes (and some more) up
to and including 8.5.5 changes are included in 8.6a3.  The following
list focuses on new features added so far in 8.6.  This release is a
development release, and should only be considered for deployment use
after considerable testing.

     * [TIP 328] New commands: [coroutine], [yield], [info coroutine].

     * [TIP 327] New command: [tailcall].

     * [TIP 195] New command: [tcl::prefix].

     * [TIP 320] New subcommand: [oo::define $class variable].

     * [TIP 236] New subcommand: [$canvas moveto].

     * [TIP 313] New option: [lsearch -bisect].

     * [TIP 326] New option: [lsort -stride].

     * [TIP 314] New option: [namespace ensemble create -parameters].

     * [TIP 331] New support: [lset listVar end+1 $value].

     * [TIP 318] Revised default whitespace character set for [string trim].
          *** POTENTIAL INCOMPATIBILITY ***

     * [TIP 323] Many variadic commands now accept zero arguments.

     * [TIP 315] New variable: tcl_platform(pathSeparator).

     * [TIP 265] New utility routine: Tcl_ParseArgv().

     * [TIP 316] Portable C interface to Tcl_StatBuf fields.

     * [TIP 330] Stronger barrier to interp->result access.  Stop it!
          *** POTENTIAL INCOMPATIBILITY ***

     * [TIP 27] Several more CONST-ified C interfaces.
          *** POTENTIAL INCOMPATIBILITY; Use -DCONST86 to disable ***

     * Fixed several bugs in new OO facilities.

     * Fixed several bugs in the new non-recursive evaluation engine.

     * Support for pre-ANSI compilers via _ANSI_ARGS_ removed.

--
Tcl Core Team and Maintainers
Don Porter, Tcl Core Release Manager