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solc 0.7.0 Changes.md

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140 - solc 0.7.0 Changes

Solidity v0.7.0 Changes to the Syntax - changes that might cause existing contracts to not compile anymore:

  1. In external function and contract creation calls, Ether and gas is now specified using a new syntax: x.f{gas: 10000, value: 2 ether}(arg1, arg2). The old syntax – x.f.gas(10000).value(2 ether)(arg1, arg2) – will cause an error.

  2. The global variable now is deprecated, block.timestamp should be used instead. The single identifier now is too generic for a global variable and could give the impression that it changes during transaction processing, whereas block.timestamp correctly reflects the fact that it is just a property of the block.

  3. NatSpec comments on variables are only allowed for public state variables and not for local or internal variables

  4. The token gwei is a keyword now (used to specify, e.g. 2 gwei as a number) and cannot be used as an identifier

  5. String literals now can only contain printable ASCII characters and this also includes a variety of escape sequences, such as hexadecimal (\xff) and unicode escapes (\u20ac).

  6. Unicode string literals are supported now to accommodate valid UTF-8 sequences. They are identified with the unicode prefix: unicode"Hello 😃".

  7. State Mutability: The state mutability of functions can now be restricted during inheritance. Functions with default state mutability can be overridden by pure and view functions while view functions can be overridden by pure functions. At the same time, public state variables are considered view and even pure if they are constants.

    1. Disallow . in user-defined function and variable names in inline assembly. It is still valid if you use Solidity in Yul-only mode.

  8. Slot and offset of storage pointer variable x are accessed via x.slot and x.offset instead of x_slot and x_offset.

Slide Screenshot

140.jpg

Slide Text

  • Calls -> gas & value
  • now -> block.timestamp
  • Natspec -> Vars
  • gwei -> Keyword
  • String Literals
  • Unicode
  • Fn State Mutability
  • Assembly Changes

References

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