diff options
| -rw-r--r-- | clippy_lints/src/casts/borrow_as_ptr.rs | 10 | ||||
| -rw-r--r-- | clippy_lints/src/methods/unnecessary_to_owned.rs | 5 | ||||
| -rw-r--r-- | clippy_utils/src/lib.rs | 12 | ||||
| -rw-r--r-- | tests/ui/unnecessary_to_owned.fixed | 36 | ||||
| -rw-r--r-- | tests/ui/unnecessary_to_owned.rs | 36 | ||||
| -rw-r--r-- | tests/ui/unnecessary_to_owned.stderr | 86 |
6 files changed, 73 insertions, 112 deletions
diff --git a/clippy_lints/src/casts/borrow_as_ptr.rs b/clippy_lints/src/casts/borrow_as_ptr.rs index d143629da3a..64345c81a24 100644 --- a/clippy_lints/src/casts/borrow_as_ptr.rs +++ b/clippy_lints/src/casts/borrow_as_ptr.rs @@ -2,11 +2,10 @@ use clippy_utils::diagnostics::span_lint_and_sugg; use clippy_utils::msrvs::Msrv; use clippy_utils::source::{snippet_with_applicability, snippet_with_context}; use clippy_utils::sugg::has_enclosing_paren; -use clippy_utils::{is_lint_allowed, msrvs, std_or_core}; +use clippy_utils::{is_expr_temporary_value, is_lint_allowed, msrvs, std_or_core}; use rustc_errors::Applicability; use rustc_hir::{BorrowKind, Expr, ExprKind, Mutability, Ty, TyKind}; use rustc_lint::LateContext; -use rustc_middle::ty::adjustment::Adjust; use rustc_span::BytePos; use super::BORROW_AS_PTR; @@ -25,12 +24,7 @@ pub(super) fn check<'tcx>( let mut app = Applicability::MachineApplicable; let snip = snippet_with_context(cx, e.span, cast_expr.span.ctxt(), "..", &mut app).0; // Fix #9884 - if !e.is_place_expr(|base| { - cx.typeck_results() - .adjustments() - .get(base.hir_id) - .is_some_and(|x| x.iter().any(|adj| matches!(adj.kind, Adjust::Deref(_)))) - }) { + if is_expr_temporary_value(cx, e) { return false; } diff --git a/clippy_lints/src/methods/unnecessary_to_owned.rs b/clippy_lints/src/methods/unnecessary_to_owned.rs index a71b3659fd2..62ba3012643 100644 --- a/clippy_lints/src/methods/unnecessary_to_owned.rs +++ b/clippy_lints/src/methods/unnecessary_to_owned.rs @@ -6,7 +6,8 @@ use clippy_utils::source::{SpanRangeExt, snippet}; use clippy_utils::ty::{get_iterator_item_ty, implements_trait, is_copy, is_type_diagnostic_item, is_type_lang_item}; use clippy_utils::visitors::find_all_ret_expressions; use clippy_utils::{ - fn_def_id, get_parent_expr, is_diag_item_method, is_diag_trait_item, peel_middle_ty_refs, return_ty, + fn_def_id, get_parent_expr, is_diag_item_method, is_diag_trait_item, is_expr_temporary_value, peel_middle_ty_refs, + return_ty, }; use rustc_errors::Applicability; use rustc_hir::def::{DefKind, Res}; @@ -219,6 +220,8 @@ fn check_into_iter_call_arg( && let Some(receiver_snippet) = receiver.span.get_source_text(cx) // If the receiver is a `Cow`, we can't remove the `into_owned` generally, see https://github.com/rust-lang/rust-clippy/issues/13624. && !is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(receiver), sym::Cow) + // Calling `iter()` on a temporary object can lead to false positives. #14242 + && !is_expr_temporary_value(cx, receiver) { if unnecessary_iter_cloned::check_for_loop_iter(cx, parent, method_name, receiver, true) { return true; diff --git a/clippy_utils/src/lib.rs b/clippy_utils/src/lib.rs index 0c1728d1349..2d2a19c7b78 100644 --- a/clippy_utils/src/lib.rs +++ b/clippy_utils/src/lib.rs @@ -2331,6 +2331,18 @@ pub fn is_expr_final_block_expr(tcx: TyCtxt<'_>, expr: &Expr<'_>) -> bool { matches!(tcx.parent_hir_node(expr.hir_id), Node::Block(..)) } +/// Checks if the expression is a temporary value. +// This logic is the same as the one used in rustc's `check_named_place_expr function`. +// https://github.com/rust-lang/rust/blob/3ed2a10d173d6c2e0232776af338ca7d080b1cd4/compiler/rustc_hir_typeck/src/expr.rs#L482-L499 +pub fn is_expr_temporary_value(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool { + !expr.is_place_expr(|base| { + cx.typeck_results() + .adjustments() + .get(base.hir_id) + .is_some_and(|x| x.iter().any(|adj| matches!(adj.kind, Adjust::Deref(_)))) + }) +} + pub fn std_or_core(cx: &LateContext<'_>) -> Option<&'static str> { if !is_no_std_crate(cx) { Some("std") diff --git a/tests/ui/unnecessary_to_owned.fixed b/tests/ui/unnecessary_to_owned.fixed index bf271aef763..5410033dbd8 100644 --- a/tests/ui/unnecessary_to_owned.fixed +++ b/tests/ui/unnecessary_to_owned.fixed @@ -195,19 +195,11 @@ fn main() { //~^ unnecessary_to_owned let _ = slice.iter().copied(); //~^ unnecessary_to_owned - let _ = [std::path::PathBuf::new()][..].iter().cloned(); - //~^ unnecessary_to_owned - let _ = [std::path::PathBuf::new()][..].iter().cloned(); - //~^ unnecessary_to_owned let _ = slice.iter().copied(); //~^ unnecessary_to_owned let _ = slice.iter().copied(); //~^ unnecessary_to_owned - let _ = [std::path::PathBuf::new()][..].iter().cloned(); - //~^ unnecessary_to_owned - let _ = [std::path::PathBuf::new()][..].iter().cloned(); - //~^ unnecessary_to_owned let _ = check_files(&[FileType::Account]); @@ -317,19 +309,6 @@ fn get_file_path(_file_type: &FileType) -> Result<std::path::PathBuf, std::io::E fn require_string(_: &String) {} -#[clippy::msrv = "1.35"] -fn _msrv_1_35() { - // `copied` was stabilized in 1.36, so clippy should use `cloned`. - let _ = &["x"][..].iter().cloned(); - //~^ unnecessary_to_owned -} - -#[clippy::msrv = "1.36"] -fn _msrv_1_36() { - let _ = &["x"][..].iter().copied(); - //~^ unnecessary_to_owned -} - // https://github.com/rust-lang/rust-clippy/issues/8507 mod issue_8507 { #![allow(dead_code)] @@ -680,3 +659,18 @@ fn issue13624() -> impl IntoIterator { cow.into_owned().into_iter() } + +mod issue_14242 { + use std::rc::Rc; + + #[derive(Copy, Clone)] + struct Foo; + + fn rc_slice_provider() -> Rc<[Foo]> { + Rc::from([Foo]) + } + + fn iterator_provider() -> impl Iterator<Item = Foo> { + rc_slice_provider().to_vec().into_iter() + } +} diff --git a/tests/ui/unnecessary_to_owned.rs b/tests/ui/unnecessary_to_owned.rs index 95b95ab6bd2..0619dd4ddec 100644 --- a/tests/ui/unnecessary_to_owned.rs +++ b/tests/ui/unnecessary_to_owned.rs @@ -195,19 +195,11 @@ fn main() { //~^ unnecessary_to_owned let _ = slice.to_owned().into_iter(); //~^ unnecessary_to_owned - let _ = [std::path::PathBuf::new()][..].to_vec().into_iter(); - //~^ unnecessary_to_owned - let _ = [std::path::PathBuf::new()][..].to_owned().into_iter(); - //~^ unnecessary_to_owned let _ = IntoIterator::into_iter(slice.to_vec()); //~^ unnecessary_to_owned let _ = IntoIterator::into_iter(slice.to_owned()); //~^ unnecessary_to_owned - let _ = IntoIterator::into_iter([std::path::PathBuf::new()][..].to_vec()); - //~^ unnecessary_to_owned - let _ = IntoIterator::into_iter([std::path::PathBuf::new()][..].to_owned()); - //~^ unnecessary_to_owned let _ = check_files(&[FileType::Account]); @@ -317,19 +309,6 @@ fn get_file_path(_file_type: &FileType) -> Result<std::path::PathBuf, std::io::E fn require_string(_: &String) {} -#[clippy::msrv = "1.35"] -fn _msrv_1_35() { - // `copied` was stabilized in 1.36, so clippy should use `cloned`. - let _ = &["x"][..].to_vec().into_iter(); - //~^ unnecessary_to_owned -} - -#[clippy::msrv = "1.36"] -fn _msrv_1_36() { - let _ = &["x"][..].to_vec().into_iter(); - //~^ unnecessary_to_owned -} - // https://github.com/rust-lang/rust-clippy/issues/8507 mod issue_8507 { #![allow(dead_code)] @@ -680,3 +659,18 @@ fn issue13624() -> impl IntoIterator { cow.into_owned().into_iter() } + +mod issue_14242 { + use std::rc::Rc; + + #[derive(Copy, Clone)] + struct Foo; + + fn rc_slice_provider() -> Rc<[Foo]> { + Rc::from([Foo]) + } + + fn iterator_provider() -> impl Iterator<Item = Foo> { + rc_slice_provider().to_vec().into_iter() + } +} diff --git a/tests/ui/unnecessary_to_owned.stderr b/tests/ui/unnecessary_to_owned.stderr index 4daa3876e60..8926db34da8 100644 --- a/tests/ui/unnecessary_to_owned.stderr +++ b/tests/ui/unnecessary_to_owned.stderr @@ -1,11 +1,11 @@ error: redundant clone - --> tests/ui/unnecessary_to_owned.rs:225:64 + --> tests/ui/unnecessary_to_owned.rs:217:64 | LL | require_c_str(&CString::from_vec_with_nul(vec![0]).unwrap().to_owned()); | ^^^^^^^^^^^ help: remove this | note: this value is dropped without further use - --> tests/ui/unnecessary_to_owned.rs:225:20 + --> tests/ui/unnecessary_to_owned.rs:217:20 | LL | require_c_str(&CString::from_vec_with_nul(vec![0]).unwrap().to_owned()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -13,49 +13,49 @@ LL | require_c_str(&CString::from_vec_with_nul(vec![0]).unwrap().to_owned()) = help: to override `-D warnings` add `#[allow(clippy::redundant_clone)]` error: redundant clone - --> tests/ui/unnecessary_to_owned.rs:227:40 + --> tests/ui/unnecessary_to_owned.rs:219:40 | LL | require_os_str(&OsString::from("x").to_os_string()); | ^^^^^^^^^^^^^^^ help: remove this | note: this value is dropped without further use - --> tests/ui/unnecessary_to_owned.rs:227:21 + --> tests/ui/unnecessary_to_owned.rs:219:21 | LL | require_os_str(&OsString::from("x").to_os_string()); | ^^^^^^^^^^^^^^^^^^^ error: redundant clone - --> tests/ui/unnecessary_to_owned.rs:229:48 + --> tests/ui/unnecessary_to_owned.rs:221:48 | LL | require_path(&std::path::PathBuf::from("x").to_path_buf()); | ^^^^^^^^^^^^^^ help: remove this | note: this value is dropped without further use - --> tests/ui/unnecessary_to_owned.rs:229:19 + --> tests/ui/unnecessary_to_owned.rs:221:19 | LL | require_path(&std::path::PathBuf::from("x").to_path_buf()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: redundant clone - --> tests/ui/unnecessary_to_owned.rs:231:35 + --> tests/ui/unnecessary_to_owned.rs:223:35 | LL | require_str(&String::from("x").to_string()); | ^^^^^^^^^^^^ help: remove this | note: this value is dropped without further use - --> tests/ui/unnecessary_to_owned.rs:231:18 + --> tests/ui/unnecessary_to_owned.rs:223:18 | LL | require_str(&String::from("x").to_string()); | ^^^^^^^^^^^^^^^^^ error: redundant clone - --> tests/ui/unnecessary_to_owned.rs:233:39 + --> tests/ui/unnecessary_to_owned.rs:225:39 | LL | require_slice(&[String::from("x")].to_owned()); | ^^^^^^^^^^^ help: remove this | note: this value is dropped without further use - --> tests/ui/unnecessary_to_owned.rs:233:20 + --> tests/ui/unnecessary_to_owned.rs:225:20 | LL | require_slice(&[String::from("x")].to_owned()); | ^^^^^^^^^^^^^^^^^^^ @@ -442,43 +442,19 @@ LL | let _ = slice.to_owned().into_iter(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `slice.iter().copied()` error: unnecessary use of `to_vec` - --> tests/ui/unnecessary_to_owned.rs:198:13 - | -LL | let _ = [std::path::PathBuf::new()][..].to_vec().into_iter(); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `[std::path::PathBuf::new()][..].iter().cloned()` - -error: unnecessary use of `to_owned` - --> tests/ui/unnecessary_to_owned.rs:200:13 - | -LL | let _ = [std::path::PathBuf::new()][..].to_owned().into_iter(); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `[std::path::PathBuf::new()][..].iter().cloned()` - -error: unnecessary use of `to_vec` - --> tests/ui/unnecessary_to_owned.rs:203:13 + --> tests/ui/unnecessary_to_owned.rs:199:13 | LL | let _ = IntoIterator::into_iter(slice.to_vec()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `slice.iter().copied()` error: unnecessary use of `to_owned` - --> tests/ui/unnecessary_to_owned.rs:205:13 + --> tests/ui/unnecessary_to_owned.rs:201:13 | LL | let _ = IntoIterator::into_iter(slice.to_owned()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `slice.iter().copied()` -error: unnecessary use of `to_vec` - --> tests/ui/unnecessary_to_owned.rs:207:13 - | -LL | let _ = IntoIterator::into_iter([std::path::PathBuf::new()][..].to_vec()); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `[std::path::PathBuf::new()][..].iter().cloned()` - -error: unnecessary use of `to_owned` - --> tests/ui/unnecessary_to_owned.rs:209:13 - | -LL | let _ = IntoIterator::into_iter([std::path::PathBuf::new()][..].to_owned()); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `[std::path::PathBuf::new()][..].iter().cloned()` - error: allocating a new `String` only to create a temporary `&str` from it - --> tests/ui/unnecessary_to_owned.rs:237:26 + --> tests/ui/unnecessary_to_owned.rs:229:26 | LL | let _ref_str: &str = &String::from_utf8(slice.to_vec()).expect("not UTF-8"); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -490,7 +466,7 @@ LL + let _ref_str: &str = core::str::from_utf8(&slice).expect("not UTF-8"); | error: allocating a new `String` only to create a temporary `&str` from it - --> tests/ui/unnecessary_to_owned.rs:239:26 + --> tests/ui/unnecessary_to_owned.rs:231:26 | LL | let _ref_str: &str = &String::from_utf8(b"foo".to_vec()).unwrap(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -502,7 +478,7 @@ LL + let _ref_str: &str = core::str::from_utf8(b"foo").unwrap(); | error: allocating a new `String` only to create a temporary `&str` from it - --> tests/ui/unnecessary_to_owned.rs:241:26 + --> tests/ui/unnecessary_to_owned.rs:233:26 | LL | let _ref_str: &str = &String::from_utf8(b"foo".as_slice().to_owned()).unwrap(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -514,7 +490,7 @@ LL + let _ref_str: &str = core::str::from_utf8(b"foo".as_slice()).unwrap(); | error: unnecessary use of `to_vec` - --> tests/ui/unnecessary_to_owned.rs:299:14 + --> tests/ui/unnecessary_to_owned.rs:291:14 | LL | for t in file_types.to_vec() { | ^^^^^^^^^^^^^^^^^^^ @@ -526,65 +502,53 @@ LL | LL ~ let path = match get_file_path(t) { | -error: unnecessary use of `to_vec` - --> tests/ui/unnecessary_to_owned.rs:323:14 - | -LL | let _ = &["x"][..].to_vec().into_iter(); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `["x"][..].iter().cloned()` - -error: unnecessary use of `to_vec` - --> tests/ui/unnecessary_to_owned.rs:329:14 - | -LL | let _ = &["x"][..].to_vec().into_iter(); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `["x"][..].iter().copied()` - error: unnecessary use of `to_string` - --> tests/ui/unnecessary_to_owned.rs:378:24 + --> tests/ui/unnecessary_to_owned.rs:357:24 | LL | Box::new(build(y.to_string())) | ^^^^^^^^^^^^^ help: use: `y` error: unnecessary use of `to_string` - --> tests/ui/unnecessary_to_owned.rs:488:12 + --> tests/ui/unnecessary_to_owned.rs:467:12 | LL | id("abc".to_string()) | ^^^^^^^^^^^^^^^^^ help: use: `"abc"` error: unnecessary use of `to_vec` - --> tests/ui/unnecessary_to_owned.rs:632:37 + --> tests/ui/unnecessary_to_owned.rs:611:37 | LL | IntoFuture::into_future(foo([].to_vec(), &0)); | ^^^^^^^^^^^ help: use: `[]` error: unnecessary use of `to_vec` - --> tests/ui/unnecessary_to_owned.rs:643:18 + --> tests/ui/unnecessary_to_owned.rs:622:18 | LL | s.remove(&a.to_vec()); | ^^^^^^^^^^^ help: replace it with: `a` error: unnecessary use of `to_owned` - --> tests/ui/unnecessary_to_owned.rs:648:14 + --> tests/ui/unnecessary_to_owned.rs:627:14 | LL | s.remove(&"b".to_owned()); | ^^^^^^^^^^^^^^^ help: replace it with: `"b"` error: unnecessary use of `to_string` - --> tests/ui/unnecessary_to_owned.rs:650:14 + --> tests/ui/unnecessary_to_owned.rs:629:14 | LL | s.remove(&"b".to_string()); | ^^^^^^^^^^^^^^^^ help: replace it with: `"b"` error: unnecessary use of `to_vec` - --> tests/ui/unnecessary_to_owned.rs:656:14 + --> tests/ui/unnecessary_to_owned.rs:635:14 | LL | s.remove(&["b"].to_vec()); | ^^^^^^^^^^^^^^^ help: replace it with: `["b"].as_slice()` error: unnecessary use of `to_vec` - --> tests/ui/unnecessary_to_owned.rs:658:14 + --> tests/ui/unnecessary_to_owned.rs:637:14 | LL | s.remove(&(&["b"]).to_vec()); | ^^^^^^^^^^^^^^^^^^ help: replace it with: `(&["b"]).as_slice()` -error: aborting due to 88 previous errors +error: aborting due to 82 previous errors |