Solidity 0.6.2 - new selector syntax

[fulldecent]

Blockers

• Release Solidity 0.6.2 final

Issue

Currently, code is used like this:

    constructor(address instanceRegistry, address templateContract) public {
        CountdownGriefingEscrow template;

        // set instance type
        bytes4 instanceType = bytes4(keccak256(bytes('Escrow')));
        // set initSelector
        bytes4 initSelector = template.initialize.selector;
        // initialize factory params
        Factory._initialize(instanceRegistry, templateContract, instanceType, initSelector);
    }

Soon this can be used instead:

    constructor(address instanceRegistry, address templateContract) public {
        // set instance type
        bytes4 instanceType = bytes4(keccak256(bytes('Escrow')));
        // set initSelector
        bytes4 initSelector = CountdownGriefingEscrow.initialize.selector;
        // initialize factory params
        Factory._initialize(instanceRegistry, templateContract, instanceType, initSelector);
    }

References

• Allow static access to interface function selectors ethereum/solidity#3506
• Add a new Function Type referring to FunctionDefinition's without calling context and use it to allow selector lookup. ethereum/solidity#8105