ink! 3.0.0 RC 3

Version 3.0-rc3 (2021-03-02)

This is the 3rd release candidate for ink! 3.0.

The list below shows the additions, changes and fixes that are visible to users of ink!.

Compatibility

ink! 3.0-rc3 is compatible with

• The cargo-contract CLI tool version 0.9.1 or newer.
  • Install newest version using cargo install --force cargo-contract.
• Substrate version 3.0 including the contracts-pallet version 3.0.

Added

• Implemented chain extensions feature for ink!.
• ink!'s official documentation portal: https://paritytech.github.io/ink-docs/
• It is now possible to pass a salt argument to contract instantiations.
• Implemented fuzz testing for the ink! codebase.

Changed

• Migrate ink_storage::SmallVec and ink_storage::lazy::SmallLazyArray to use min_const_generics.
  • The min_const_generics feature is going to be stabilized in Rust 1.51. For now it was put behind
    the ink-unstable crate feature of the ink_storage crate.
• Improve error reporting for conflicting ink! attributes.
• Improve error reporting for invalid constructor or message selector. (#561)
• Remove iter_mut for ink_storage::BinaryHeap data structure.
• Add documented demonstration how to properly mock transferred_balance calls: #555
• Add contract example which uses ext_transfer and ext_terminate: #554
• Improve documentation of transfer and minimum_balance APIs: #540

Fixed

• The Delegator example contract now compiles properly using the build-all.sh bash script.
• Update crate dependencies:
  • scale-info 0.6
  • parity-scale-codec 2.0
  • rand 0.8
  • itertools 0.10
• Remove unused tiny-keccak dependency from ink_primitives.
• Changed the default BlockNumber type to u32. This is a fix since it now properly mirrors Substrate's default BlockNumber type.
• Ensure topics are unique: #594
• Several fixes for ink_storage data structures, including:
  • Drop implementation for Pack now works properly. (#600)
  • Drop implementation for Lazy now always properly clean up storage. (#597)
  • Nested Lazy now properly clears storage data. (#583)
  • Option fields now properly clean up nested storage data. (#570)