diff options
| -rw-r--r-- | src/tools/clippy/clippy_lints/src/significant_drop_tightening.rs | 30 |
1 files changed, 16 insertions, 14 deletions
diff --git a/src/tools/clippy/clippy_lints/src/significant_drop_tightening.rs b/src/tools/clippy/clippy_lints/src/significant_drop_tightening.rs index e9db7c9d031..76874cc3420 100644 --- a/src/tools/clippy/clippy_lints/src/significant_drop_tightening.rs +++ b/src/tools/clippy/clippy_lints/src/significant_drop_tightening.rs @@ -79,10 +79,11 @@ impl<'tcx> LateLintPass<'tcx> for SignificantDropTightening<'tcx> { if apa.counter <= 1 || !apa.has_expensive_expr_after_last_attr { continue; } + let first_bind_ident = apa.first_bind_ident.unwrap(); span_lint_and_then( cx, SIGNIFICANT_DROP_TIGHTENING, - apa.first_bind_ident.span, + first_bind_ident.span, "temporary with significant `Drop` can be early dropped", |diag| { match apa.counter { @@ -91,13 +92,13 @@ impl<'tcx> LateLintPass<'tcx> for SignificantDropTightening<'tcx> { let indent = " ".repeat(indent_of(cx, apa.last_stmt_span).unwrap_or(0)); let init_method = snippet(cx, apa.first_method_span, ".."); let usage_method = snippet(cx, apa.last_method_span, ".."); - let stmt = if apa.last_bind_ident == Ident::empty() { - format!("\n{indent}{init_method}.{usage_method};") - } else { + let stmt = if let Some(last_bind_ident) = apa.last_bind_ident { format!( "\n{indent}let {} = {init_method}.{usage_method};", - snippet(cx, apa.last_bind_ident.span, ".."), + snippet(cx, last_bind_ident.span, ".."), ) + } else { + format!("\n{indent}{init_method}.{usage_method};") }; diag.multipart_suggestion_verbose( @@ -113,7 +114,7 @@ impl<'tcx> LateLintPass<'tcx> for SignificantDropTightening<'tcx> { format!( "\n{}drop({});", " ".repeat(indent_of(cx, apa.last_stmt_span).unwrap_or(0)), - apa.first_bind_ident + first_bind_ident ), Applicability::MaybeIncorrect, ); @@ -124,7 +125,7 @@ impl<'tcx> LateLintPass<'tcx> for SignificantDropTightening<'tcx> { apa.first_block_span, format!( "temporary `{}` is currently being dropped at the end of its contained scope", - apa.first_bind_ident + first_bind_ident ), ); }, @@ -283,7 +284,7 @@ impl<'tcx> Visitor<'tcx> for StmtsChecker<'_, '_, '_, '_, 'tcx> { let mut apa = AuxParamsAttr { first_block_hir_id: self.ap.curr_block_hir_id, first_block_span: self.ap.curr_block_span, - first_bind_ident: ident, + first_bind_ident: Some(ident), first_method_span: { let expr_or_init = expr_or_init(self.cx, expr); if let hir::ExprKind::MethodCall(_, local_expr, _, span) = expr_or_init.kind { @@ -307,7 +308,7 @@ impl<'tcx> Visitor<'tcx> for StmtsChecker<'_, '_, '_, '_, 'tcx> { match self.ap.curr_stmt.kind { hir::StmtKind::Let(local) => { if let hir::PatKind::Binding(_, _, ident, _) = local.pat.kind { - apa.last_bind_ident = ident; + apa.last_bind_ident = Some(ident); } if let Some(local_init) = local.init && let hir::ExprKind::MethodCall(_, _, _, span) = local_init.kind @@ -373,7 +374,7 @@ struct AuxParamsAttr { first_block_span: Span, /// The binding or variable that references the initial construction of the type marked with /// `#[has_significant_drop]`. - first_bind_ident: Ident, + first_bind_ident: Option<Ident>, /// Similar to `init_bind_ident` but encompasses the right-hand method call. first_method_span: Span, /// Similar to `init_bind_ident` but encompasses the whole contained statement. @@ -381,7 +382,7 @@ struct AuxParamsAttr { /// The last visited binding or variable span within a block that had any referenced inner type /// marked with `#[has_significant_drop]`. - last_bind_ident: Ident, + last_bind_ident: Option<Ident>, /// Similar to `last_bind_span` but encompasses the right-hand method call. last_method_span: Span, /// Similar to `last_bind_span` but encompasses the whole contained statement. @@ -395,10 +396,10 @@ impl Default for AuxParamsAttr { has_expensive_expr_after_last_attr: false, first_block_hir_id: HirId::INVALID, first_block_span: DUMMY_SP, - first_bind_ident: Ident::empty(), + first_bind_ident: None, first_method_span: DUMMY_SP, first_stmt_span: DUMMY_SP, - last_bind_ident: Ident::empty(), + last_bind_ident: None, last_method_span: DUMMY_SP, last_stmt_span: DUMMY_SP, } @@ -413,7 +414,7 @@ fn dummy_stmt_expr<'any>(expr: &'any hir::Expr<'any>) -> hir::Stmt<'any> { } } -fn has_drop(expr: &hir::Expr<'_>, first_bind_ident: &Ident, lcx: &LateContext<'_>) -> bool { +fn has_drop(expr: &hir::Expr<'_>, first_bind_ident: &Option<Ident>, lcx: &LateContext<'_>) -> bool { if let hir::ExprKind::Call(fun, [first_arg]) = expr.kind && let hir::ExprKind::Path(hir::QPath::Resolved(_, fun_path)) = &fun.kind && let Res::Def(DefKind::Fn, did) = fun_path.res @@ -422,6 +423,7 @@ fn has_drop(expr: &hir::Expr<'_>, first_bind_ident: &Ident, lcx: &LateContext<'_ let has_ident = |local_expr: &hir::Expr<'_>| { if let hir::ExprKind::Path(hir::QPath::Resolved(_, arg_path)) = &local_expr.kind && let [first_arg_ps, ..] = arg_path.segments + && let Some(first_bind_ident) = first_bind_ident && &first_arg_ps.ident == first_bind_ident { true |