let-chains-advisor
Simplify Rust If-Let Control Flow
Nested pattern matching can hide the main decision path in Rust code. This skill helps Claude, Codex, and Claude Code suggest let chains for clearer Rust 2024 control flow.
Install with my Agent
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Review the Skillstore skill "let-chains-advisor" from https://skillstore.io/skills/emillindfors-let-chains-advisor.md and its manifest at https://skillstore.io/api/skills/emillindfors-let-chains-advisor/manifest. Verify the artifact. You may proceed after verification, subject to the environment's own policy.Your Agent should still show its plan and request any confirmation required by the security policy.
Agent-readable resources
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Test it
Using "let-chains-advisor". A function has three nested if-let statements to unwrap user, profile, and email values.
Expected outcome:
The skill recommends a single let chain that checks each value in order and returns the email in the success branch.
Using "let-chains-advisor". A processing function checks an optional value, validates it, then checks its size before doing work.
Expected outcome:
The skill suggests combining the pattern match and guard conditions into one readable control-flow condition.
Using "let-chains-advisor". A project uses an older Rust edition or version below the let chain requirement.
Expected outcome:
The skill explains that the refactor should wait until the project supports Rust 1.88 and edition 2024.
Security Audit
SafeAll static findings are false positives caused by Markdown code fences around Rust and TOML examples in SKILL.md. No evidence found of external command execution, prompt injection, data exfiltration, network access, or unsafe tool permissions.
Risk Factors
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APA citation
EmilLindfors. (2026). let-chains-advisor security audit report (audit version 4) [Author version 1.0.0]. Skillstore. https://skillstore.io/skills/emillindfors-let-chains-advisor/audits/4BibTeX citation
@techreport{emillindfors-emillindfors-let-chains-advisor-2026,
author = {EmilLindfors},
title = {let-chains-advisor security audit report (audit version 4)},
institution = {Skillstore},
year = {2026},
number = {4},
url = {https://skillstore.io/skills/emillindfors-let-chains-advisor/audits/4},
note = {Author version 1.0.0}
}CITATION.cff
cff-version: 1.2.0
message: "If you use this Skill, cite its author and this versioned security audit report."
title: "let-chains-advisor security audit report (audit version 4)"
version: "1.0.0"
type: report
authors:
- name: "EmilLindfors"
date-released: "2026-07-06"
url: "https://skillstore.io/skills/emillindfors-let-chains-advisor/audits/4"
identifiers:
- type: other
value: "skillstore:emillindfors-let-chains-advisor:audit:4"
description: "Skillstore immutable audit report identifier"
Skillstore Score
Why this score Evidence Confidence: HighWhat You Can Build
Refactor Nested Option Handling
Replace multiple nested Option checks with a shorter let chain while keeping fallback behavior clear.
Review Pattern Matching Readability
Identify control flow that is hard to scan and suggest modern Rust syntax where it fits.
Modernize Rust 2024 Code
Apply let chains to eligible code during an edition upgrade or cleanup pass.
Try These Prompts
Review this Rust function for nested if-let expressions. Suggest a let chain only if it improves readability and the code targets Rust 2024.
Scan this Rust module for nested Option or Result checks. Recommend let chain refactors and explain any cases that should stay unchanged.
Analyze these nested pattern matches and boolean guards. Propose Rust 2024 let chains where ordering, readability, and behavior remain clear.
Review this Rust 2021 code for Rust 2024 let chain opportunities. Note version requirements, semantic risks, and tests that should verify the refactor.
Best Practices
- Confirm the Rust version and edition before applying let chains.
- Keep let chains short enough that the success path remains easy to read.
- Review ownership and borrowing changes after each refactor.
Avoid
- Do not replace simple two-level checks when nesting is already clear.
- Do not use let chains if they hide important error handling behavior.
- Do not refactor without tests for branches that return early or fall through.
Frequently Asked Questions
What Rust version does this skill target?
Does the skill run code or tests?
Can it refactor Result handling?
Will every nested if-let become a let chain?
Does it support Claude Code and Codex?
What should reviewers check after using it?
Developer Details
Author
EmilLindforsLicense
MIT
Author version
v1.0.0
Skillstore revision
r1
Ref
a06681402992ceae98ba04d54cfd4ab004862696
Maintenance freshness
7/18/2026
Usage
5 downloads · 131 views
File structure
📄 SKILL.md