0.7.0

• motoko (moc)

  • BREAKING CHANGE (Minor):
    Adds new syntax for merging records (objects) and
    adding/overwriting fields. The expression

    { baseA and baseB with field1 = val1; field2 = val2 }

    creates a new record by joining all (statically known) fields from
    baseA/B and the explicitly specified field1/2.
    This is a breaking change, as a new keyword with has been added.
    Restrictions for ambiguous and var fields from bases apply. (#3084)

  • Add new support for installing actor class instances on the IC,
    enabling specification of canister settings, install, upgrade and
    reinstall. (#3386)

    A new expression

      (system <exp> . <id>)
    

    where <exp> is an imported library and <id> is the name of
    an actor class, accesses a secondary constructor of the class
    that takes an additional argument controlling the installation.

    For example,

      await (system Lib.Node)(#upgrade a)(i);

    upgrades actor a with the code for a new instance of class Lib.Node,
    passing constructor argument (i).

  • Performance improvements for assigment-heavy code (thanks to nomeata) (#3406)