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Merge pull request #10224 from ethereum/strict-literal-to-enum-conversion

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[BREAKING] Strict explicit conversion between literals and enums
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chriseth
2020-11-10 13:15:12 +01:00
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docs/080-breaking-changes.rst
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@@ -35,12 +35,16 @@ the compiler notifying you about it.
New Restrictions
================
* Explicit conversions from negative literals and literals larger than ``type(uint160).max`` to
``address`` are disallowed. Similarly, explicit conversions between literals and an integer type
``T`` are only allowed if the literal lies between ``type(T).min`` and ``type(T).max``. In
particular, replace usages of ``uint(-1)`` with ``type(uint).max``.
* There are new restrictions related to explicit conversion of literals. The previous behaviour in
the following cases was likely ambiguous:
The previous behaviour was likely ambiguous.
1. Explicit conversions from negative literals and literals larger than ``type(uint160).max`` to
``address`` are disallowed.
2. Explicit conversions between literals and an integer type ``T`` are only allowed if the literal
lies between ``type(T).min`` and ``type(T).max``. In particular, replace usages of ``uint(-1)``
with ``type(uint).max``.
3. Explicit conversions between literals and enums are only allowed if the literal can
represent a value in the enum.
* Function call options can only be given once, i.e. ``c.f{gas: 10000}{value: 1}()`` is invalid and has to be changed to ``c.f{gas: 10000, value: 1}()``.