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(); } ```

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A-lintC-enhancementgood first issue

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

could be

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

Research direction: Implement a new lint that detects the pattern of nested if else with duplicate expressions and suggests combining them with logical OR and NOT. Study existing lints like `collapsible if` for AST traversal and suggestion generation.
Tech stack: rust
Domain: tooling
Issue type: Feature
Difficulty: 3
Estimated time: 1-2 days
Activity status: Active
Clarity: Clear
Prerequisites: Rust
Newbie friendliness: 65