v4.0.0-alpha.1

Version 4.0.0-alpha.1

Compatibility

In order to build contracts which use ink! v4.0.0-alpha.1 you need to use cargo-contract
v2.0.0-alpha.1. You can install it as follows:

cargo install cargo-contract --version 2.0.0-alpha.1

We recommend using a version of the pallet-contracts later than 6b85535
(Aug 12, 2022) in your node.

The compatibility issues will be with ChainExtension's and the functions mentioned above.

Breaking Changes

This release contains a few breaking changes. These are indicated with the ❌ emoji.
Most of these were intitially introduced in v3.1.0 and v3.2.0 releases but
compatibility was restored in v3.3.0.

• As part of #1224 the return type of ink_env::set_contract_storage() was changed to
  return an Option<u32> instead of ().
• As part of #1233 the eth_compatibility crate was removed. The
  ecdsa_to_eth_address() function from it can now be found in the ink_env crate.
• As part of #1267 an argument to ink_lang::codegen::execute_constructor() (which is
  used internally by the ink! macros) was removed.
• As part of #1313 the ink! ABI was changed so that the version was specified using a
  dedicated version key instead of an implicit key which wrapped the entire ABI.

Added

• ❌ Add Mapping::contains(key) and Mapping::insert_return_size(key, val) ‒ #1224
• Add payment-channel example ‒ #1248
• ❌ Add version field to ink! metadata ‒ #1313
• The rand-extension example has been adapted to an updated version of the ChainExtension API ‒ #1356

Changed

• ❌ Contract size optimization in case contract doesn't accept payment ‒ #1267 (thanks @xgreenx).
• Move ink! linter into ink repository ‒ #1361

Removed

• ❌ Implement ecdsa_to_eth_address() and remove eth_compatibility crate ‒ #1233