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Solidity v0.9.0 Breaking Changes
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This section highlights the main breaking changes introduced in Solidity
version 0.9.0.
For the full list check
`the release changelog <https://github.com/ethereum/solidity/releases/tag/v0.9.0>`_.

Silent Changes of the Semantics
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New Restrictions
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- Make ``basefee`` a reserved identifier in assembly.

Interface Changes
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How to update your code
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