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Merge remote-tracking branch 'upstream/master' into sync-from-rust

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This commit is contained in:
Takayuki Nakata 2020-12-08 17:01:25 +09:00
commit bd7f9c6c1c
31 changed files with 722 additions and 109 deletions
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1
CHANGELOG.md
View file

@ -2024,6 +2024,7 @@ Released 2018-09-13
[`redundant_closure`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure
[`redundant_closure_call`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure_call
[`redundant_closure_for_method_calls`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure_for_method_calls
[`redundant_else`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_else
[`redundant_field_names`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[`redundant_pattern`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern
[`redundant_pattern_matching`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching

7
clippy_lints/src/functions.rs
View file

@ -405,13 +405,10 @@ impl<'tcx> Functions {
break;
}
if in_comment {
match line.find("*/") {
Some(i) => {
if let Some(i) = line.find("*/") {
line = &line[i + 2..];
in_comment = false;
continue;
},
None => break,
}
} else {
let multi_idx = line.find("/*").unwrap_or_else(|| line.len());
@ -423,8 +420,8 @@ impl<'tcx> Functions {
in_comment = true;
continue;
}
break;
}
break;
}
if code_in_line {
line_count += 1;

9
clippy_lints/src/future_not_send.rs
View file

@ -92,13 +92,8 @@ impl<'tcx> LateLintPass<'tcx> for FutureNotSend {
|db| {
cx.tcx.infer_ctxt().enter(|infcx| {
for FulfillmentError { obligation, .. } in send_errors {
infcx.maybe_note_obligation_cause_for_async_await(
db,
&obligation,
);
if let Trait(trait_pred, _) =
obligation.predicate.skip_binders()
{
infcx.maybe_note_obligation_cause_for_async_await(db, &obligation);
if let Trait(trait_pred, _) = obligation.predicate.skip_binders() {
db.note(&format!(
"`{}` doesn't implement `{}`",
trait_pred.self_ty(),

3
clippy_lints/src/len_zero.rs
View file

@ -222,9 +222,8 @@ fn check_impl_items(cx: &LateContext<'_>, item: &Item<'_>, impl_items: &[ImplIte
let is_empty = if let Some(is_empty) = impl_items.iter().find(|i| is_named_self(cx, i, "is_empty")) {
if cx.access_levels.is_exported(is_empty.id.hir_id) {
return;
} else {
"a private"
}
"a private"
} else {
"no corresponding"
};

4
clippy_lints/src/lib.rs
View file

@ -294,6 +294,7 @@ mod question_mark;
mod ranges;
mod redundant_clone;
mod redundant_closure_call;
mod redundant_else;
mod redundant_field_names;
mod redundant_pub_crate;
mod redundant_static_lifetimes;
@ -831,6 +832,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
&ranges::REVERSED_EMPTY_RANGES,
&redundant_clone::REDUNDANT_CLONE,
&redundant_closure_call::REDUNDANT_CLOSURE_CALL,
&redundant_else::REDUNDANT_ELSE,
&redundant_field_names::REDUNDANT_FIELD_NAMES,
&redundant_pub_crate::REDUNDANT_PUB_CRATE,
&redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES,
@ -1132,6 +1134,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
store.register_early_pass(|| box items_after_statements::ItemsAfterStatements);
store.register_early_pass(|| box precedence::Precedence);
store.register_early_pass(|| box needless_continue::NeedlessContinue);
store.register_early_pass(|| box redundant_else::RedundantElse);
store.register_late_pass(|| box create_dir::CreateDir);
store.register_early_pass(|| box needless_arbitrary_self_type::NeedlessArbitrarySelfType);
store.register_early_pass(|| box redundant_static_lifetimes::RedundantStaticLifetimes);
@ -1308,6 +1311,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
LintId::of(&pass_by_ref_or_value::TRIVIALLY_COPY_PASS_BY_REF),
LintId::of(&ranges::RANGE_MINUS_ONE),
LintId::of(&ranges::RANGE_PLUS_ONE),
LintId::of(&redundant_else::REDUNDANT_ELSE),
LintId::of(&ref_option_ref::REF_OPTION_REF),
LintId::of(&shadow::SHADOW_UNRELATED),
LintId::of(&strings::STRING_ADD_ASSIGN),

3
clippy_lints/src/matches.rs
View file

@ -689,10 +689,9 @@ fn check_single_match(cx: &LateContext<'_>, ex: &Expr<'_>, arms: &[Arm<'_>], exp
if stmts.len() == 1 && block_expr.is_none() || stmts.is_empty() && block_expr.is_some() {
// single statement/expr "else" block, don't lint
return;
} else {
}
// block with 2+ statements or 1 expr and 1+ statement
Some(els)
}
} else {
// not a block, don't lint
return;

3
clippy_lints/src/methods/unnecessary_filter_map.rs
View file

@ -69,12 +69,11 @@ fn check_expression<'tcx>(cx: &LateContext<'tcx>, arg_id: hir::HirId, expr: &'tc
}
}
return (true, false);
} else {
}
// We don't know. It might do anything.
return (true, true);
}
}
}
(true, true)
},
hir::ExprKind::Block(ref block, _) => block

7
clippy_lints/src/needless_pass_by_value.rs
View file

@ -90,9 +90,10 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByValue {
// Exclude non-inherent impls
if let Some(Node::Item(item)) = cx.tcx.hir().find(cx.tcx.hir().get_parent_node(hir_id)) {
if matches!(item.kind, ItemKind::Impl{ of_trait: Some(_), .. } |
ItemKind::Trait(..))
{
if matches!(
item.kind,
ItemKind::Impl { of_trait: Some(_), .. } | ItemKind::Trait(..)
) {
return;
}
}

3
clippy_lints/src/non_expressive_names.rs
View file

@ -409,12 +409,11 @@ fn levenstein_not_1(a_name: &str, b_name: &str) -> bool {
if let Some(b2) = b_chars.next() {
// check if there's just one character inserted
return a != b2 || a_chars.ne(b_chars);
} else {
}
// tuple
// ntuple
return true;
}
}
// for item in items
true
}

68
clippy_lints/src/panic_in_result_fn.rs
View file

@ -1,18 +1,16 @@
use crate::utils::{is_expn_of, is_type_diagnostic_item, return_ty, span_lint_and_then};
use crate::utils::{find_macro_calls, is_type_diagnostic_item, return_ty, span_lint_and_then};
use rustc_hir as hir;
use rustc_hir::intravisit::{self, FnKind, NestedVisitorMap, Visitor};
use rustc_hir::Expr;
use rustc_hir::intravisit::FnKind;
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::hir::map::Map;
use rustc_session::{declare_lint_pass, declare_tool_lint};
use rustc_span::{sym, Span};
declare_clippy_lint! {
/// **What it does:** Checks for usage of `panic!`, `unimplemented!`, `todo!` or `unreachable!` in a function of type result.
/// **What it does:** Checks for usage of `panic!`, `unimplemented!`, `todo!`, `unreachable!` or assertions in a function of type result.
///
/// **Why is this bad?** For some codebases, it is desirable for functions of type result to return an error instead of crashing. Hence unimplemented, panic and unreachable should be avoided.
/// **Why is this bad?** For some codebases, it is desirable for functions of type result to return an error instead of crashing. Hence panicking macros should be avoided.
///
/// **Known problems:** None.
/// **Known problems:** Functions called from a function returning a `Result` may invoke a panicking macro. This is not checked.
///
/// **Example:**
///
@ -22,9 +20,15 @@ declare_clippy_lint! {
/// panic!("error");
/// }
/// ```
/// Use instead:
/// ```rust
/// fn result_without_panic() -> Result<bool, String> {
/// Err(String::from("error"))
/// }
/// ```
pub PANIC_IN_RESULT_FN,
restriction,
"functions of type `Result<..>` that contain `panic!()`, `todo!()` or `unreachable()` or `unimplemented()` "
"functions of type `Result<..>` that contain `panic!()`, `todo!()`, `unreachable()`, `unimplemented()` or assertion"
}
declare_lint_pass!(PanicInResultFn => [PANIC_IN_RESULT_FN]);
@ -47,43 +51,33 @@ impl<'tcx> LateLintPass<'tcx> for PanicInResultFn {
}
}
struct FindPanicUnimplementedUnreachable {
result: Vec<Span>,
}
impl<'tcx> Visitor<'tcx> for FindPanicUnimplementedUnreachable {
type Map = Map<'tcx>;
fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
if ["unimplemented", "unreachable", "panic", "todo"]
.iter()
.any(|fun| is_expn_of(expr.span, fun).is_some())
{
self.result.push(expr.span);
}
// and check sub-expressions
intravisit::walk_expr(self, expr);
}
fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
NestedVisitorMap::None
}
}
fn lint_impl_body<'tcx>(cx: &LateContext<'tcx>, impl_span: Span, body: &'tcx hir::Body<'tcx>) {
let mut panics = FindPanicUnimplementedUnreachable { result: Vec::new() };
panics.visit_expr(&body.value);
if !panics.result.is_empty() {
let panics = find_macro_calls(
&[
"unimplemented",
"unreachable",
"panic",
"todo",
"assert",
"assert_eq",
"assert_ne",
"debug_assert",
"debug_assert_eq",
"debug_assert_ne",
],
body,
);
if !panics.is_empty() {
span_lint_and_then(
cx,
PANIC_IN_RESULT_FN,
impl_span,
"used `unimplemented!()`, `unreachable!()`, `todo!()` or `panic!()` in a function that returns `Result`",
"used `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertion in a function that returns `Result`",
move |diag| {
diag.help(
"`unimplemented!()`, `unreachable!()`, `todo!()` or `panic!()` should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing",
"`unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertions should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing",
);
diag.span_note(panics.result, "return Err() instead of panicking");
diag.span_note(panics, "return Err() instead of panicking");
},
);
}

7
clippy_lints/src/pass_by_ref_or_value.rs
View file

@ -244,9 +244,10 @@ impl<'tcx> LateLintPass<'tcx> for PassByRefOrValue {
// Exclude non-inherent impls
if let Some(Node::Item(item)) = cx.tcx.hir().find(cx.tcx.hir().get_parent_node(hir_id)) {
if matches!(item.kind, ItemKind::Impl{ of_trait: Some(_), .. } |
ItemKind::Trait(..))
{
if matches!(
item.kind,
ItemKind::Impl { of_trait: Some(_), .. } | ItemKind::Trait(..)
) {
return;
}
}

5
clippy_lints/src/redundant_clone.rs
View file

@ -390,7 +390,10 @@ impl<'tcx> mir::visit::Visitor<'tcx> for LocalUseVisitor {
let local = place.local;
if local == self.used.0
&& !matches!(ctx, PlaceContext::MutatingUse(MutatingUseContext::Drop) | PlaceContext::NonUse(_))
&& !matches!(
ctx,
PlaceContext::MutatingUse(MutatingUseContext::Drop) | PlaceContext::NonUse(_)
)
{
self.used.1 = true;
}

135
clippy_lints/src/redundant_else.rs Normal file
View file

@ -0,0 +1,135 @@
use crate::utils::span_lint_and_help;
use rustc_ast::ast::{Block, Expr, ExprKind, Stmt, StmtKind};
use rustc_ast::visit::{walk_expr, Visitor};
use rustc_lint::{EarlyContext, EarlyLintPass};
use rustc_middle::lint::in_external_macro;
use rustc_session::{declare_lint_pass, declare_tool_lint};
declare_clippy_lint! {
/// **What it does:** Checks for `else` blocks that can be removed without changing semantics.
///
/// **Why is this bad?** The `else` block adds unnecessary indentation and verbosity.
///
/// **Known problems:** Some may prefer to keep the `else` block for clarity.
///
/// **Example:**
///
/// ```rust
/// fn my_func(count: u32) {
/// if count == 0 {
/// print!("Nothing to do");
/// return;
/// } else {
/// print!("Moving on...");
/// }
/// }
/// ```
/// Use instead:
/// ```rust
/// fn my_func(count: u32) {
/// if count == 0 {
/// print!("Nothing to do");
/// return;
/// }
/// print!("Moving on...");
/// }
/// ```
pub REDUNDANT_ELSE,
pedantic,
"`else` branch that can be removed without changing semantics"
}
declare_lint_pass!(RedundantElse => [REDUNDANT_ELSE]);
impl EarlyLintPass for RedundantElse {
fn check_stmt(&mut self, cx: &EarlyContext<'_>, stmt: &Stmt) {
if in_external_macro(cx.sess, stmt.span) {
return;
}
// Only look at expressions that are a whole statement
let expr: &Expr = match &stmt.kind {
StmtKind::Expr(expr) | StmtKind::Semi(expr) => expr,
_ => return,
};
// if else
let (mut then, mut els): (&Block, &Expr) = match &expr.kind {
ExprKind::If(_, then, Some(els)) => (then, els),
_ => return,
};
loop {
if !BreakVisitor::default().check_block(then) {
// then block does not always break
return;
}
match &els.kind {
// else if else
ExprKind::If(_, next_then, Some(next_els)) => {
then = next_then;
els = next_els;
continue;
},
// else if without else
ExprKind::If(..) => return,
// done
_ => break,
}
}
span_lint_and_help(
cx,
REDUNDANT_ELSE,
els.span,
"redundant else block",
None,
"remove the `else` block and move the contents out",
);
}
}
/// Call `check` functions to check if an expression always breaks control flow
#[derive(Default)]
struct BreakVisitor {
is_break: bool,
}
impl<'ast> Visitor<'ast> for BreakVisitor {
fn visit_block(&mut self, block: &'ast Block) {
self.is_break = match block.stmts.as_slice() {
[.., last] => self.check_stmt(last),
_ => false,
};
}
fn visit_expr(&mut self, expr: &'ast Expr) {
self.is_break = match expr.kind {
ExprKind::Break(..) | ExprKind::Continue(..) | ExprKind::Ret(..) => true,
ExprKind::Match(_, ref arms) => arms.iter().all(|arm| self.check_expr(&arm.body)),
ExprKind::If(_, ref then, Some(ref els)) => self.check_block(then) && self.check_expr(els),
ExprKind::If(_, _, None)
// ignore loops for simplicity
| ExprKind::While(..) | ExprKind::ForLoop(..) | ExprKind::Loop(..) => false,
_ => {
walk_expr(self, expr);
return;
},
};
}
}
impl BreakVisitor {
fn check<T>(&mut self, item: T, visit: fn(&mut Self, T)) -> bool {
visit(self, item);
std::mem::replace(&mut self.is_break, false)
}
fn check_block(&mut self, block: &Block) -> bool {
self.check(block, Self::visit_block)
}
fn check_expr(&mut self, expr: &Expr) -> bool {
self.check(expr, Self::visit_expr)
}
fn check_stmt(&mut self, stmt: &Stmt) -> bool {
self.check(stmt, Self::visit_stmt)
}
}

4
clippy_lints/src/types.rs
View file

@ -1104,7 +1104,9 @@ fn is_empty_block(expr: &Expr<'_>) -> bool {
expr.kind,
ExprKind::Block(
Block {
stmts: &[], expr: None, ..
stmts: &[],
expr: None,
..
},
_,
)

5
clippy_lints/src/unnecessary_wraps.rs
View file

@ -74,7 +74,10 @@ impl<'tcx> LateLintPass<'tcx> for UnnecessaryWraps {
}
if let Some(Node::Item(item)) = cx.tcx.hir().find(cx.tcx.hir().get_parent_node(hir_id)) {
if matches!(item.kind, ItemKind::Impl{ of_trait: Some(_), ..} | ItemKind::Trait(..)) {
if matches!(
item.kind,
ItemKind::Impl { of_trait: Some(_), .. } | ItemKind::Trait(..)
) {
return;
}
}

5
clippy_lints/src/utils/ast_utils.rs
View file

@ -408,7 +408,10 @@ pub fn eq_use_tree_kind(l: &UseTreeKind, r: &UseTreeKind) -> bool {
}
pub fn eq_defaultness(l: Defaultness, r: Defaultness) -> bool {
matches!((l, r), (Defaultness::Final, Defaultness::Final) | (Defaultness::Default(_), Defaultness::Default(_)))
matches!(
(l, r),
(Defaultness::Final, Defaultness::Final) | (Defaultness::Default(_), Defaultness::Default(_))
)
}
pub fn eq_vis(l: &Visibility, r: &Visibility) -> bool {

33
clippy_lints/src/utils/mod.rs
View file

@ -41,7 +41,7 @@ use rustc_errors::Applicability;
use rustc_hir as hir;
use rustc_hir::def::{DefKind, Res};
use rustc_hir::def_id::{DefId, CRATE_DEF_INDEX, LOCAL_CRATE};
use rustc_hir::intravisit::{NestedVisitorMap, Visitor};
use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
use rustc_hir::Node;
use rustc_hir::{
def, Arm, Block, Body, Constness, Crate, Expr, ExprKind, FnDecl, HirId, ImplItem, ImplItemKind, Item, ItemKind,
@ -603,6 +603,37 @@ pub fn contains_return(expr: &hir::Expr<'_>) -> bool {
visitor.found
}
struct FindMacroCalls<'a, 'b> {
names: &'a [&'b str],
result: Vec<Span>,
}
impl<'a, 'b, 'tcx> Visitor<'tcx> for FindMacroCalls<'a, 'b> {
type Map = Map<'tcx>;
fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
if self.names.iter().any(|fun| is_expn_of(expr.span, fun).is_some()) {
self.result.push(expr.span);
}
// and check sub-expressions
intravisit::walk_expr(self, expr);
}
fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
NestedVisitorMap::None
}
}
/// Finds calls of the specified macros in a function body.
pub fn find_macro_calls(names: &[&str], body: &Body<'_>) -> Vec<Span> {
let mut fmc = FindMacroCalls {
names,
result: Vec::new(),
};
fmc.visit_expr(&body.value);
fmc.result
}
/// Converts a span to a code snippet if available, otherwise use default.
///
/// This is useful if you want to provide suggestions for your lint or more generally, if you want

15
clippy_lints/src/utils/usage.rs
View file

@ -116,20 +116,27 @@ pub struct ParamBindingIdCollector {
}
impl<'tcx> ParamBindingIdCollector {
fn collect_binding_hir_ids(body: &'tcx hir::Body<'tcx>) -> Vec<hir::HirId> {
let mut hir_ids: Vec<hir::HirId> = Vec::new();
for param in body.params.iter() {
let mut finder = ParamBindingIdCollector {
binding_hir_ids: Vec::new(),
};
finder.visit_body(body);
finder.binding_hir_ids
finder.visit_param(param);
for hir_id in &finder.binding_hir_ids {
hir_ids.push(*hir_id);
}
}
hir_ids
}
}
impl<'tcx> intravisit::Visitor<'tcx> for ParamBindingIdCollector {
type Map = Map<'tcx>;
fn visit_param(&mut self, param: &'tcx hir::Param<'tcx>) {
if let hir::PatKind::Binding(_, hir_id, ..) = param.pat.kind {
fn visit_pat(&mut self, pat: &'tcx hir::Pat<'tcx>) {
if let hir::PatKind::Binding(_, hir_id, ..) = pat.kind {
self.binding_hir_ids.push(hir_id);
}
intravisit::walk_pat(self, pat);
}
fn nested_visit_map(&mut self) -> intravisit::NestedVisitorMap<Self::Map> {

24
tests/ui/panic_in_result_fn.stderr
View file

@ -1,4 +1,4 @@
error: used `unimplemented!()`, `unreachable!()`, `todo!()` or `panic!()` in a function that returns `Result`
error: used `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertion in a function that returns `Result`
--> $DIR/panic_in_result_fn.rs:7:5
|
LL | / fn result_with_panic() -> Result<bool, String> // should emit lint
@ -8,7 +8,7 @@ LL | | }
| |_____^
|
= note: `-D clippy::panic-in-result-fn` implied by `-D warnings`
= help: `unimplemented!()`, `unreachable!()`, `todo!()` or `panic!()` should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing
= help: `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertions should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing
note: return Err() instead of panicking
--> $DIR/panic_in_result_fn.rs:9:9
|
@ -16,7 +16,7 @@ LL | panic!("error");
| ^^^^^^^^^^^^^^^^
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
error: used `unimplemented!()`, `unreachable!()`, `todo!()` or `panic!()` in a function that returns `Result`
error: used `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertion in a function that returns `Result`
--> $DIR/panic_in_result_fn.rs:12:5
|
LL | / fn result_with_unimplemented() -> Result<bool, String> // should emit lint
@ -25,7 +25,7 @@ LL | | unimplemented!();
LL | | }
| |_____^
|
= help: `unimplemented!()`, `unreachable!()`, `todo!()` or `panic!()` should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing
= help: `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertions should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing
note: return Err() instead of panicking
--> $DIR/panic_in_result_fn.rs:14:9
|
@ -33,7 +33,7 @@ LL | unimplemented!();
| ^^^^^^^^^^^^^^^^^
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
error: used `unimplemented!()`, `unreachable!()`, `todo!()` or `panic!()` in a function that returns `Result`
error: used `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertion in a function that returns `Result`
--> $DIR/panic_in_result_fn.rs:17:5
|
LL | / fn result_with_unreachable() -> Result<bool, String> // should emit lint
@ -42,7 +42,7 @@ LL | | unreachable!();
LL | | }
| |_____^
|
= help: `unimplemented!()`, `unreachable!()`, `todo!()` or `panic!()` should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing
= help: `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertions should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing
note: return Err() instead of panicking
--> $DIR/panic_in_result_fn.rs:19:9
|
@ -50,7 +50,7 @@ LL | unreachable!();
| ^^^^^^^^^^^^^^^
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
error: used `unimplemented!()`, `unreachable!()`, `todo!()` or `panic!()` in a function that returns `Result`
error: used `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertion in a function that returns `Result`
--> $DIR/panic_in_result_fn.rs:22:5
|
LL | / fn result_with_todo() -> Result<bool, String> // should emit lint
@ -59,7 +59,7 @@ LL | | todo!("Finish this");
LL | | }
| |_____^
|
= help: `unimplemented!()`, `unreachable!()`, `todo!()` or `panic!()` should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing
= help: `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertions should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing
note: return Err() instead of panicking
--> $DIR/panic_in_result_fn.rs:24:9
|
@ -67,7 +67,7 @@ LL | todo!("Finish this");
| ^^^^^^^^^^^^^^^^^^^^^
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
error: used `unimplemented!()`, `unreachable!()`, `todo!()` or `panic!()` in a function that returns `Result`
error: used `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertion in a function that returns `Result`
--> $DIR/panic_in_result_fn.rs:53:1
|
LL | / fn function_result_with_panic() -> Result<bool, String> // should emit lint
@ -76,7 +76,7 @@ LL | | panic!("error");
LL | | }
| |_^
|
= help: `unimplemented!()`, `unreachable!()`, `todo!()` or `panic!()` should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing
= help: `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertions should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing
note: return Err() instead of panicking
--> $DIR/panic_in_result_fn.rs:55:5
|
@ -84,7 +84,7 @@ LL | panic!("error");
| ^^^^^^^^^^^^^^^^
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
error: used `unimplemented!()`, `unreachable!()`, `todo!()` or `panic!()` in a function that returns `Result`
error: used `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertion in a function that returns `Result`
--> $DIR/panic_in_result_fn.rs:68:1
|
LL | / fn main() -> Result<(), String> {
@ -93,7 +93,7 @@ LL | | Ok(())
LL | | }
| |_^
|
= help: `unimplemented!()`, `unreachable!()`, `todo!()` or `panic!()` should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing
= help: `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertions should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing
note: return Err() instead of panicking
--> $DIR/panic_in_result_fn.rs:69:5
|

48
tests/ui/panic_in_result_fn_assertions.rs Normal file
View file

@ -0,0 +1,48 @@
#![warn(clippy::panic_in_result_fn)]
#![allow(clippy::unnecessary_wraps)]
struct A;
impl A {
fn result_with_assert_with_message(x: i32) -> Result<bool, String> // should emit lint
{
assert!(x == 5, "wrong argument");
Ok(true)
}
fn result_with_assert_eq(x: i32) -> Result<bool, String> // should emit lint
{
assert_eq!(x, 5);
Ok(true)
}
fn result_with_assert_ne(x: i32) -> Result<bool, String> // should emit lint
{
assert_ne!(x, 1);
Ok(true)
}
fn other_with_assert_with_message(x: i32) // should not emit lint
{
assert!(x == 5, "wrong argument");
}
fn other_with_assert_eq(x: i32) // should not emit lint
{
assert_eq!(x, 5);
}
fn other_with_assert_ne(x: i32) // should not emit lint
{
assert_ne!(x, 1);
}
fn result_without_banned_functions() -> Result<bool, String> // should not emit lint
{
let assert = "assert!";
println!("No {}", assert);
Ok(true)
}
}
fn main() {}

57
tests/ui/panic_in_result_fn_assertions.stderr Normal file
View file

@ -0,0 +1,57 @@
error: used `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertion in a function that returns `Result`
--> $DIR/panic_in_result_fn_assertions.rs:7:5
|
LL | / fn result_with_assert_with_message(x: i32) -> Result<bool, String> // should emit lint
LL | | {
LL | | assert!(x == 5, "wrong argument");
LL | | Ok(true)
LL | | }
| |_____^
|
= note: `-D clippy::panic-in-result-fn` implied by `-D warnings`
= help: `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertions should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing
note: return Err() instead of panicking
--> $DIR/panic_in_result_fn_assertions.rs:9:9
|
LL | assert!(x == 5, "wrong argument");
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
error: used `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertion in a function that returns `Result`
--> $DIR/panic_in_result_fn_assertions.rs:13:5
|
LL | / fn result_with_assert_eq(x: i32) -> Result<bool, String> // should emit lint
LL | | {
LL | | assert_eq!(x, 5);
LL | | Ok(true)
LL | | }
| |_____^
|
= help: `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertions should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing
note: return Err() instead of panicking
--> $DIR/panic_in_result_fn_assertions.rs:15:9
|
LL | assert_eq!(x, 5);
| ^^^^^^^^^^^^^^^^^
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
error: used `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertion in a function that returns `Result`
--> $DIR/panic_in_result_fn_assertions.rs:19:5
|
LL | / fn result_with_assert_ne(x: i32) -> Result<bool, String> // should emit lint
LL | | {
LL | | assert_ne!(x, 1);
LL | | Ok(true)
LL | | }
| |_____^
|
= help: `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertions should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing
note: return Err() instead of panicking
--> $DIR/panic_in_result_fn_assertions.rs:21:9
|
LL | assert_ne!(x, 1);
| ^^^^^^^^^^^^^^^^^
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to 3 previous errors

48
tests/ui/panic_in_result_fn_debug_assertions.rs Normal file
View file

@ -0,0 +1,48 @@
#![warn(clippy::panic_in_result_fn)]
#![allow(clippy::unnecessary_wraps)]
struct A;
impl A {
fn result_with_debug_assert_with_message(x: i32) -> Result<bool, String> // should emit lint
{
debug_assert!(x == 5, "wrong argument");
Ok(true)
}
fn result_with_debug_assert_eq(x: i32) -> Result<bool, String> // should emit lint
{
debug_assert_eq!(x, 5);
Ok(true)
}
fn result_with_debug_assert_ne(x: i32) -> Result<bool, String> // should emit lint
{
debug_assert_ne!(x, 1);
Ok(true)
}
fn other_with_debug_assert_with_message(x: i32) // should not emit lint
{
debug_assert!(x == 5, "wrong argument");
}
fn other_with_debug_assert_eq(x: i32) // should not emit lint
{
debug_assert_eq!(x, 5);
}
fn other_with_debug_assert_ne(x: i32) // should not emit lint
{
debug_assert_ne!(x, 1);
}
fn result_without_banned_functions() -> Result<bool, String> // should not emit lint
{
let debug_assert = "debug_assert!";
println!("No {}", debug_assert);
Ok(true)
}
}
fn main() {}

57
tests/ui/panic_in_result_fn_debug_assertions.stderr Normal file
View file

@ -0,0 +1,57 @@
error: used `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertion in a function that returns `Result`
--> $DIR/panic_in_result_fn_debug_assertions.rs:7:5
|
LL | / fn result_with_debug_assert_with_message(x: i32) -> Result<bool, String> // should emit lint
LL | | {
LL | | debug_assert!(x == 5, "wrong argument");
LL | | Ok(true)
LL | | }
| |_____^
|
= note: `-D clippy::panic-in-result-fn` implied by `-D warnings`
= help: `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertions should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing
note: return Err() instead of panicking
--> $DIR/panic_in_result_fn_debug_assertions.rs:9:9
|
LL | debug_assert!(x == 5, "wrong argument");
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
error: used `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertion in a function that returns `Result`
--> $DIR/panic_in_result_fn_debug_assertions.rs:13:5
|
LL | / fn result_with_debug_assert_eq(x: i32) -> Result<bool, String> // should emit lint
LL | | {
LL | | debug_assert_eq!(x, 5);
LL | | Ok(true)
LL | | }
| |_____^
|
= help: `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertions should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing
note: return Err() instead of panicking
--> $DIR/panic_in_result_fn_debug_assertions.rs:15:9
|
LL | debug_assert_eq!(x, 5);
| ^^^^^^^^^^^^^^^^^^^^^^^
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
error: used `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertion in a function that returns `Result`
--> $DIR/panic_in_result_fn_debug_assertions.rs:19:5
|
LL | / fn result_with_debug_assert_ne(x: i32) -> Result<bool, String> // should emit lint
LL | | {
LL | | debug_assert_ne!(x, 1);
LL | | Ok(true)
LL | | }
| |_____^
|
= help: `unimplemented!()`, `unreachable!()`, `todo!()`, `panic!()` or assertions should not be used in a function that returns `Result` as `Result` is expected to return an error instead of crashing
note: return Err() instead of panicking
--> $DIR/panic_in_result_fn_debug_assertions.rs:21:9
|
LL | debug_assert_ne!(x, 1);
| ^^^^^^^^^^^^^^^^^^^^^^^
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to 3 previous errors

154
tests/ui/redundant_else.rs Normal file
View file

@ -0,0 +1,154 @@
#![warn(clippy::redundant_else)]
#![allow(clippy::needless_return)]
fn main() {
loop {
// break
if foo() {
println!("Love your neighbor;");
break;
} else {
println!("yet don't pull down your hedge.");
}
// continue
if foo() {
println!("He that lies down with Dogs,");
continue;
} else {
println!("shall rise up with fleas.");
}
// match block
if foo() {
match foo() {
1 => break,
_ => return,
}
} else {
println!("You may delay, but time will not.");
}
}
// else if
if foo() {
return;
} else if foo() {
return;
} else {
println!("A fat kitchen makes a lean will.");
}
// let binding outside of block
let _ = {
if foo() {
return;
} else {
1
}
};
// else if with let binding outside of block
let _ = {
if foo() {
return;
} else if foo() {
return;
} else {
2
}
};
// inside if let
let _ = if let Some(1) = foo() {
let _ = 1;
if foo() {
return;
} else {
1
}
} else {
1
};
//
// non-lint cases
//
// sanity check
if foo() {
let _ = 1;
} else {
println!("Who is wise? He that learns from every one.");
}
// else if without else
if foo() {
return;
} else if foo() {
foo()
};
// nested if return
if foo() {
if foo() {
return;
}
} else {
foo()
};
// match with non-breaking branch
if foo() {
match foo() {
1 => foo(),
_ => return,
}
} else {
println!("Three may keep a secret, if two of them are dead.");
}
// let binding
let _ = if foo() {
return;
} else {
1
};
// assign
let a;
a = if foo() {
return;
} else {
1
};
// assign-op
a += if foo() {
return;
} else {
1
};
// if return else if else
if foo() {
return;
} else if foo() {
1
} else {
2
};
// if else if return else
if foo() {
1
} else if foo() {
return;
} else {
2
};
// else if with let binding
let _ = if foo() {
return;
} else if foo() {
return;
} else {
2
};
// inside function call
Box::new(if foo() {
return;
} else {
1
});
}
fn foo<T>() -> T {
unimplemented!("I'm not Santa Claus")
}

80
tests/ui/redundant_else.stderr Normal file
View file

@ -0,0 +1,80 @@
error: redundant else block
--> $DIR/redundant_else.rs:10:16
|
LL | } else {
| ________________^
LL | | println!("yet don't pull down your hedge.");
LL | | }
| |_________^
|
= note: `-D clippy::redundant-else` implied by `-D warnings`
= help: remove the `else` block and move the contents out
error: redundant else block
--> $DIR/redundant_else.rs:17:16
|
LL | } else {
| ________________^
LL | | println!("shall rise up with fleas.");
LL | | }
| |_________^
|
= help: remove the `else` block and move the contents out
error: redundant else block
--> $DIR/redundant_else.rs:26:16
|
LL | } else {
| ________________^
LL | | println!("You may delay, but time will not.");
LL | | }
| |_________^
|
= help: remove the `else` block and move the contents out
error: redundant else block
--> $DIR/redundant_else.rs:35:12
|
LL | } else {
| ____________^
LL | | println!("A fat kitchen makes a lean will.");
LL | | }
| |_____^
|
= help: remove the `else` block and move the contents out
error: redundant else block
--> $DIR/redundant_else.rs:42:16
|
LL | } else {
| ________________^
LL | | 1
LL | | }
| |_________^
|
= help: remove the `else` block and move the contents out
error: redundant else block
--> $DIR/redundant_else.rs:52:16
|
LL | } else {
| ________________^
LL | | 2
LL | | }
| |_________^
|
= help: remove the `else` block and move the contents out
error: redundant else block
--> $DIR/redundant_else.rs:61:16
|
LL | } else {
| ________________^
LL | | 1
LL | | }
| |_________^
|
= help: remove the `else` block and move the contents out
error: aborting due to 7 previous errors

1
tests/ui/temporary_assignment.rs
View file

@ -1,5 +1,4 @@
#![warn(clippy::temporary_assignment)]
#![allow(const_item_mutation)]
use std::ops::{Deref, DerefMut};

8
tests/ui/temporary_assignment.stderr
View file

@ -1,5 +1,5 @@
error: assignment to temporary
--> $DIR/temporary_assignment.rs:48:5
--> $DIR/temporary_assignment.rs:47:5
|
LL | Struct { field: 0 }.field = 1;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@ -7,7 +7,7 @@ LL | Struct { field: 0 }.field = 1;
= note: `-D clippy::temporary-assignment` implied by `-D warnings`
error: assignment to temporary
--> $DIR/temporary_assignment.rs:49:5
--> $DIR/temporary_assignment.rs:48:5
|
LL | / MultiStruct {
LL | | structure: Struct { field: 0 },
@ -17,13 +17,13 @@ LL | | .field = 1;
| |______________^
error: assignment to temporary
--> $DIR/temporary_assignment.rs:54:5
--> $DIR/temporary_assignment.rs:53:5
|
LL | ArrayStruct { array: [0] }.array[0] = 1;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: assignment to temporary
--> $DIR/temporary_assignment.rs:55:5
--> $DIR/temporary_assignment.rs:54:5
|
LL | (0, 0).0 = 1;
| ^^^^^^^^^^^^

4
tests/ui/unnecessary_lazy_eval_unfixable.rs
View file

@ -15,4 +15,8 @@ fn main() {
}
let _ = Ok(1).unwrap_or_else(|e::E| 2);
let _ = Ok(1).unwrap_or_else(|SomeStruct { .. }| 2);
// Fix #6343
let arr = [(Some(1),)];
Some(&0).and_then(|&i| arr[i].0);
}

7
util/dev
View file

@ -1,7 +0,0 @@
#!/bin/sh
CARGO_TARGET_DIR=$(pwd)/target/
export CARGO_TARGET_DIR
echo 'Deprecated! `util/dev` usage is deprecated, please use `cargo dev` instead.'
cd clippy_dev && cargo run -- "$@"