FuelLabs/sway

Contract self impl

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#5,905 opened on Apr 23, 2024

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ODHack12compiler: frontendcompiler: parsergood first issuelanguage featureteam:compiler

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Description

Allow self impl for contracts as a shorthand for an anonymous ABI spec. The point is to not have to write an ABI type for very small contracts.

This:

contract;
impl Contract {
    fn foo() -> u64 { 0 }
}

Should produce the same binary and ABI spec as:

contract;
abi MyAbi {
    fn foo() -> u64;
}
impl MyAbi for Contract {
    fn foo() -> u64 { 0 }
}

Contributor guide

Research direction
The feature requires modifying the Sway compiler's parser to allow `impl Contract` without an explicit ABI declaration. Likely files include `sway core/src/language/parsed/expression/` and `sway parse/src/parser.rs`. The implementation should desugar `impl Contract` into an anonymous ABI as shown in the issue. Review existing ABI handling and contract implementation code paths to ensure compatibility.
Tech stack
rust
Domain
blockchain
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Rust programmingSway language basicscompiler architecture
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25