This release adds support for calldata structs and packed encoding with ABIEncoderV2. We also introduced some changes to the C API and added support for continuous fuzzing via Google oss-fuzz. In addition to that, we added a new commandline option for improved (colorized) diagnostics formatting.

Language Features:

  • Allow calldata structs without dynamically encoded members with ABIEncoderV2.

Compiler Features:

  • ABIEncoderV2: Implement packed encoding.
  • C API (libsolc / raw soljson.js): Introduce solidity_free method which releases all internal buffers to save memory.
  • Commandline Interface: Adds new option new-reporter for improved diagnostics formatting along with color and no-color for colorized output to be forced (or explicitly disabled).


  • Code Generator: Defensively pad allocation of creationCode and runtimeCode to multiples of 32 bytes.
  • Commandline Interface: Allow yul optimizer only for strict assembly.
  • Parser: Disallow empty import statements.
  • Type Checker: Disallow mappings with data locations other than storage.
  • Type Checker: Fix internal error when a struct array index does not fit into a uint256.
  • Type System: Properly report packed encoded size for arrays and structs (mostly unused until now).

Build System:

  • Add support for continuous fuzzing via Google oss-fuzz
  • SMT: If using Z3, require version 4.6.0 or newer.
  • Soltest: Add parser that is used in the file-based unit test environment.
  • Ubuntu PPA Packages: Use CVC4 as SMT solver instead of Z3

A big thank you to all contributors who helped make this release possible!

Download the new version of Solidity here.