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docs/changes: add RFC 42.

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Catherine 2024-06-14 19:21:44 +01:00
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docs/changes.rst
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@ -55,6 +55,7 @@ Implemented RFCs
.. _RFC 27: https://amaranth-lang.org/rfcs/0027-simulator-testbenches.html
.. _RFC 30: https://amaranth-lang.org/rfcs/0030-component-metadata.html
.. _RFC 36: https://amaranth-lang.org/rfcs/0036-async-testbench-functions.html
.. _RFC 42: https://amaranth-lang.org/rfcs/0042-const-from-shape-castable.html
.. _RFC 39: https://amaranth-lang.org/rfcs/0039-empty-case.html
.. _RFC 43: https://amaranth-lang.org/rfcs/0043-rename-reset-to-init.html
.. _RFC 45: https://amaranth-lang.org/rfcs/0045-lib-memory.html
@ -75,6 +76,7 @@ Implemented RFCs
* `RFC 30`_: Component metadata
* `RFC 36`_: Async testbench functions
* `RFC 39`_: Change semantics of no-argument ``m.Case()``
* `RFC 42`_: ``Const`` from shape-castable
* `RFC 43`_: Rename ``reset=`` to ``init=``
* `RFC 45`_: Move ``hdl.Memory`` to ``lib.Memory``
* `RFC 46`_: Change ``Shape.cast(range(1))`` to ``unsigned(0)``
@ -105,6 +107,7 @@ Language changes
* Changed: :py:`Value.matches()` with no patterns is :py:`Const(0)` instead of :py:`Const(1)`. (`RFC 39`_)
* Changed: :py:`Signal(range(stop), init=stop)` warning has been changed into a hard error and made to trigger on any out-of range value.
* Changed: :py:`Signal(range(0))` is now valid without a warning.
* Changed: :py:`Const(value, shape)` now accepts shape-castable objects as :py:`shape`. (`RFC 42`_)
* Changed: :py:`Shape.cast(range(1))` is now :py:`unsigned(0)`. (`RFC 46`_)
* Changed: the :py:`reset=` argument of :class:`Signal`, :meth:`Signal.like`, :class:`amaranth.lib.wiring.Member`, :class:`amaranth.lib.cdc.FFSynchronizer`, and :py:`m.FSM()` has been renamed to :py:`init=`. (`RFC 43`_)
* Changed: :class:`Shape` has been made immutable and hashable.