菜单
Diagnose and fix common snforge test errors including Sierra compilation failures, cost computation cycles, and version mismatches; use when tests fail with cryptic errors even though `scarb build` succeeds.
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基于 SOC 职业分类
Document Cairo language quirks, gotchas, and idiomatic workarounds; use when encountering unexpected compilation errors or behaviors in Cairo that differ from Rust.
Guide implementing custom numeric types in Cairo with invariant enforcement, overflow safety, and standard trait implementations; use when implementing fixed-point, signed integers, or other numeric primitives.
Explain how to write and run Cairo tests, including `#[test]`, assert macros, `#[should_panic]`, `#[ignore]`, and `#[available_gas]`; use when a request involves writing or running unit tests in Cairo.
Explain Cairo Array usage, ArrayTrait methods, array! macro, Span, and array read/write constraints; use when a request involves creating, updating, reading, or passing arrays in Cairo.
Explain Cairo associated items (functions, types, constants, implementations) in traits and impls; use when a request involves associated types, constants, or clarifying trait item placement in Cairo.
Explain Cairo closures, syntax, capture rules, type inference, and Fn traits; use when a request involves anonymous functions or passing behavior as a parameter in Cairo.
| name | cairo-snforge-troubleshooting |
| description | Diagnose and fix common snforge test errors including Sierra compilation failures, cost computation cycles, and version mismatches; use when tests fail with cryptic errors even though `scarb build` succeeds. |
Guide debugging snforge test failures, particularly Sierra compilation errors that occur after successful Cairo compilation.
references/common-errors.md before diagnosing.Scarb.toml settings first - enable-gas = false causes many issues.enable-gas setting.+Drop<T>, +Copy<T> bounds and struct derives.scarb build passes but scarb test fails: issue is test-specific compilation.Cause: enable-gas = false in [cairo] section of Scarb.toml
Fix: Remove enable-gas = false or set to true
Cause: Version mismatch between Cairo and universal-sierra-compiler
Fix: Run snfoundryup to update toolchain
Cause: Missing trait bounds on generic implementations
Fix: Add +Drop<T>, +Copy<T> to impl and #[derive(Drop, Copy)] to structs