rust/clippy_lints/src/inline_fn_without_body.rs

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//! checks for `#[inline]` on trait methods without bodies
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use crate::utils::span_lint_and_then;
use crate::utils::sugg::DiagnosticBuilderExt;
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use rustc_ast::ast::{Attribute, Name};
use rustc_errors::Applicability;
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use rustc_hir::{TraitItem, TraitItemKind, TraitMethod};
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use rustc_lint::{LateContext, LateLintPass};
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use rustc_session::{declare_lint_pass, declare_tool_lint};
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declare_clippy_lint! {
/// **What it does:** Checks for `#[inline]` on trait methods without bodies
///
/// **Why is this bad?** Only implementations of trait methods may be inlined.
/// The inline attribute is ignored for trait methods without bodies.
///
/// **Known problems:** None.
///
/// **Example:**
/// ```rust
/// trait Animal {
/// #[inline]
/// fn name(&self) -> &'static str;
/// }
/// ```
pub INLINE_FN_WITHOUT_BODY,
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correctness,
"use of `#[inline]` on trait methods without bodies"
}
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declare_lint_pass!(InlineFnWithoutBody => [INLINE_FN_WITHOUT_BODY]);
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impl<'a, 'tcx> LateLintPass<'a, 'tcx> for InlineFnWithoutBody {
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fn check_trait_item(&mut self, cx: &LateContext<'a, 'tcx>, item: &'tcx TraitItem<'_>) {
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if let TraitItemKind::Method(_, TraitMethod::Required(_)) = item.kind {
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check_attrs(cx, item.ident.name, &item.attrs);
}
}
}
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fn check_attrs(cx: &LateContext<'_, '_>, name: Name, attrs: &[Attribute]) {
for attr in attrs {
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if !attr.check_name(sym!(inline)) {
continue;
}
span_lint_and_then(
cx,
INLINE_FN_WITHOUT_BODY,
attr.span,
&format!("use of `#[inline]` on trait method `{}` which has no body", name),
|db| {
db.suggest_remove_item(cx, attr.span, "remove", Applicability::MachineApplicable);
},
);
}
}