24 lines
723 B
Rust
24 lines
723 B
Rust
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use super::MiscEarlyLints;
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use clippy_utils::diagnostics::span_lint;
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use rustc_ast::ast::{Expr, ExprKind, UnOp};
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use rustc_lint::EarlyContext;
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use super::DOUBLE_NEG;
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pub(super) fn check(cx: &EarlyContext<'_>, expr: &Expr) {
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match expr.kind {
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ExprKind::Unary(UnOp::Neg, ref inner) => {
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if let ExprKind::Unary(UnOp::Neg, _) = inner.kind {
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span_lint(
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cx,
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DOUBLE_NEG,
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expr.span,
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"`--x` could be misinterpreted as pre-decrement by C programmers, is usually a no-op",
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);
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}
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},
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ExprKind::Lit(ref lit) => MiscEarlyLints::check_lit(cx, lit),
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_ => (),
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}
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}
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