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work in progress: new implementation for 'a[^1]'

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Andreas Rumpf 2017-10-29 19:46:17 +01:00
commit d52a1061b3
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changelog.md
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@ -22,3 +22,9 @@
for more information.
- The **unary** ``<`` is now deprecated, for ``.. <`` use ``..<`` for other usages
use the ``pred`` proc.
- We changed how array accesses "from backwards" like ``a[^1]`` or ``a[0..^1]`` are
implemented. These are now implemented purely in ``system.nim`` without compiler
support. ``system.Slice`` now takes 2 generic parameters so that it can
take ``BackwardsIndex`` indices. ``BackwardsIndex`` is produced by ``system.^``.
This means if you overload ``[]`` or ``[]=`` you need to ensure they also work
with ``system.BackwardsIndex`` (if applicable for the accessors).