improve collapsible if in complex cases with same expressions · rust-lang/rust-clippy#812

2016-03-30T14:34:06.000Z

``` rust if a { if b { f(); } } else { f(); } ``` could be ``` rust if !a || b { f(); } ```

(1 comment) (0 reactions) (1 assignee)Rust (10,406 stars) (1,391 forks)batch import

A-lintC-enhancementgood first issue

説明

if a {
    if b {
        f();
    }
} else {
    f();
}

could be

if !a || b {
    f();
}

技術スタック: rust
領域: toolingdeveloper experience
Issue 種別: feature
難度: 3
推定時間: 1-2 days
活動状況: stale
明確さ: clear
前提条件: RustClippy internalsAST knowledgeLogical expressions
初心者向け度: 45
調査方針: Examine the current implementation of the collapsible if lint in rust clippy (file clippy lints/src/collapsible if.rs). Understand how it currently detects simple nested if statements. The enhancement would require adding logic to detect cases where the else branch contains the same expression as the if body, and transform to a single conditional. Look for any existing discussions or attempts (the issue is assigned but no PR). The maintainer might have input on desired approach. Focus on the AST patterns for the given example.