58 lines
1.8 KiB
Rust
58 lines
1.8 KiB
Rust
//! checks for `#[inline]` on trait methods without bodies
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use crate::utils::span_lint_and_then;
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use crate::utils::sugg::DiagnosticBuilderExt;
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use rustc_ast::ast::Attribute;
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use rustc_errors::Applicability;
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use rustc_hir::{TraitFn, TraitItem, TraitItemKind};
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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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use rustc_span::Symbol;
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declare_clippy_lint! {
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/// **What it does:** Checks for `#[inline]` on trait methods without bodies
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///
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/// **Why is this bad?** Only implementations of trait methods may be inlined.
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/// The inline attribute is ignored for trait methods without bodies.
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///
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/// **Known problems:** None.
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///
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/// **Example:**
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/// ```rust
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/// trait Animal {
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/// #[inline]
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/// fn name(&self) -> &'static str;
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/// }
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/// ```
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pub INLINE_FN_WITHOUT_BODY,
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correctness,
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"use of `#[inline]` on trait methods without bodies"
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}
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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::Fn(_, TraitFn::Required(_)) = item.kind {
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check_attrs(cx, item.ident.name, &item.attrs);
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}
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}
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}
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fn check_attrs(cx: &LateContext<'_, '_>, name: Symbol, attrs: &[Attribute]) {
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for attr in attrs {
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if !attr.check_name(sym!(inline)) {
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continue;
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}
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span_lint_and_then(
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cx,
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INLINE_FN_WITHOUT_BODY,
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attr.span,
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&format!("use of `#[inline]` on trait method `{}` which has no body", name),
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|diag| {
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diag.suggest_remove_item(cx, attr.span, "remove", Applicability::MachineApplicable);
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},
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);
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}
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}
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