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Merge pull request #10626 from ethereum/howToUpdateYourCode

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How to update your code.
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docs/080-breaking-changes.rst
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@ -118,6 +118,7 @@ This section lists changes that might cause existing contracts to not compile an
* Remove support for the ``\b``, ``\f``, and ``\v`` escape sequences in code. * Remove support for the ``\b``, ``\f``, and ``\v`` escape sequences in code.
They can still be inserted via hexadecimal escapes, e.g. ``\x08``, ``\x0c``, and ``\x0b``, respectively. They can still be inserted via hexadecimal escapes, e.g. ``\x08``, ``\x0c``, and ``\x0b``, respectively.
* The global variables ``tx.origin`` and ``msg.sender`` have the type ``address`` instead of * The global variables ``tx.origin`` and ``msg.sender`` have the type ``address`` instead of
``address payable``. One can convert them into ``address payable`` by using an explicit ``address payable``. One can convert them into ``address payable`` by using an explicit
conversion, i.e., ``payable(tx.origin)`` or ``payable(msg.sender)``. conversion, i.e., ``payable(tx.origin)`` or ``payable(msg.sender)``.
@ -155,3 +156,18 @@ Interface Changes
Use the "compact AST" (``--ast-compact--json`` resp. ``AST``) as replacement. Use the "compact AST" (``--ast-compact--json`` resp. ``AST``) as replacement.
* The old error reporter (``--old-reporter``) has been removed. * The old error reporter (``--old-reporter``) has been removed.
How to update your code
=======================
- If you rely on wrapping arithmetic, surround each operation with ``unchecked { ... }``.
- Optional: If you use SafeMath or a similar library, change ``x.add(y)`` to ``x + y``, ``x.mul(y)`` to ``x * y`` etc.
- Add ``pragma abicoder v1;`` if you want to stay with the old ABI coder.
- Optionally remove ``pragma experimental ABIEncoderV2`` or ``pragma abicoder v2`` since it is redundant.
- Change ``byte`` to ``bytes1``.
- Add intermediate explicit type conversions if required.
- Combine ``c.f{gas: 10000}{value: 1}()`` to ``c.f{gas: 10000, value: 1}()``.
- Change ``msg.sender.transfer(x)`` to ``payable(msg.sender).transfer(x)`` or use a stored variable of ``address payable`` type.
- Change ``x**y**z`` to ``(x**y)**z``.
- Use inline assembly as a replacement for ``log0``, ..., ``log4``.