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Rename lint identity_conversion to useless_conversion

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This commit is contained in:
ThibsG 2020-05-04 17:09:02 +02:00
parent cfd720d506
commit e55b920970
7 changed files with 60 additions and 53 deletions
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4
CHANGELOG.md
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@ -805,7 +805,7 @@ Released 2018-09-13
## 0.0.166
* Rustup to *rustc 1.22.0-nightly (b7960878b 2017-10-18)*
* New lints: [`explicit_write`], [`identity_conversion`], [`implicit_hasher`], [`invalid_ref`], [`option_map_or_none`],
* New lints: [`explicit_write`], `identity_conversion`, [`implicit_hasher`], [`invalid_ref`], [`option_map_or_none`],
[`range_minus_one`], [`range_plus_one`], [`transmute_int_to_bool`], [`transmute_int_to_char`],
[`transmute_int_to_float`]
@ -1367,7 +1367,6 @@ Released 2018-09-13
[`future_not_send`]: https://rust-lang.github.io/rust-clippy/master/index.html#future_not_send
[`get_last_with_len`]: https://rust-lang.github.io/rust-clippy/master/index.html#get_last_with_len
[`get_unwrap`]: https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[`identity_conversion`]: https://rust-lang.github.io/rust-clippy/master/index.html#identity_conversion
[`identity_op`]: https://rust-lang.github.io/rust-clippy/master/index.html#identity_op
[`if_let_mutex`]: https://rust-lang.github.io/rust-clippy/master/index.html#if_let_mutex
[`if_let_redundant_pattern_matching`]: https://rust-lang.github.io/rust-clippy/master/index.html#if_let_redundant_pattern_matching
@ -1624,6 +1623,7 @@ Released 2018-09-13
[`used_underscore_binding`]: https://rust-lang.github.io/rust-clippy/master/index.html#used_underscore_binding
[`useless_asref`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_asref
[`useless_attribute`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_attribute
[`useless_conversion`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
[`useless_format`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[`useless_let_if_seq`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[`useless_transmute`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_transmute

11
clippy_lints/src/lib.rs
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@ -221,7 +221,6 @@ mod formatting;
mod functions;
mod future_not_send;
mod get_last_with_len;
mod identity_conversion;
mod identity_op;
mod if_let_mutex;
mod if_let_some_result;
@ -324,6 +323,7 @@ mod unused_io_amount;
mod unused_self;
mod unwrap;
mod use_self;
mod useless_conversion;
mod vec;
mod verbose_file_reads;
mod wildcard_dependencies;
@ -577,7 +577,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
&functions::TOO_MANY_LINES,
&future_not_send::FUTURE_NOT_SEND,
&get_last_with_len::GET_LAST_WITH_LEN,
&identity_conversion::IDENTITY_CONVERSION,
&identity_op::IDENTITY_OP,
&if_let_mutex::IF_LET_MUTEX,
&if_let_some_result::IF_LET_SOME_RESULT,
@ -843,6 +842,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
&unwrap::PANICKING_UNWRAP,
&unwrap::UNNECESSARY_UNWRAP,
&use_self::USE_SELF,
&useless_conversion::USELESS_CONVERSION,
&utils::internal_lints::CLIPPY_LINTS_INTERNAL,
&utils::internal_lints::COLLAPSIBLE_SPAN_LINT_CALLS,
&utils::internal_lints::COMPILER_LINT_FUNCTIONS,
@ -980,7 +980,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
store.register_late_pass(|| box bytecount::ByteCount);
store.register_late_pass(|| box infinite_iter::InfiniteIter);
store.register_late_pass(|| box inline_fn_without_body::InlineFnWithoutBody);
store.register_late_pass(|| box identity_conversion::IdentityConversion::default());
store.register_late_pass(|| box useless_conversion::UselessConversion::default());
store.register_late_pass(|| box types::ImplicitHasher);
store.register_late_pass(|| box fallible_impl_from::FallibleImplFrom);
store.register_late_pass(|| box types::UnitArg);
@ -1241,7 +1241,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
LintId::of(&functions::NOT_UNSAFE_PTR_ARG_DEREF),
LintId::of(&functions::TOO_MANY_ARGUMENTS),
LintId::of(&get_last_with_len::GET_LAST_WITH_LEN),
LintId::of(&identity_conversion::IDENTITY_CONVERSION),
LintId::of(&identity_op::IDENTITY_OP),
LintId::of(&if_let_mutex::IF_LET_MUTEX),
LintId::of(&if_let_some_result::IF_LET_SOME_RESULT),
@ -1427,6 +1426,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
LintId::of(&unused_io_amount::UNUSED_IO_AMOUNT),
LintId::of(&unwrap::PANICKING_UNWRAP),
LintId::of(&unwrap::UNNECESSARY_UNWRAP),
LintId::of(&useless_conversion::USELESS_CONVERSION),
LintId::of(&vec::USELESS_VEC),
LintId::of(&write::PRINTLN_EMPTY_STRING),
LintId::of(&write::PRINT_LITERAL),
@ -1546,7 +1546,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
LintId::of(&format::USELESS_FORMAT),
LintId::of(&functions::TOO_MANY_ARGUMENTS),
LintId::of(&get_last_with_len::GET_LAST_WITH_LEN),
LintId::of(&identity_conversion::IDENTITY_CONVERSION),
LintId::of(&identity_op::IDENTITY_OP),
LintId::of(&int_plus_one::INT_PLUS_ONE),
LintId::of(&lifetimes::EXTRA_UNUSED_LIFETIMES),
@ -1605,6 +1604,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
LintId::of(&types::UNNECESSARY_CAST),
LintId::of(&types::VEC_BOX),
LintId::of(&unwrap::UNNECESSARY_UNWRAP),
LintId::of(&useless_conversion::USELESS_CONVERSION),
LintId::of(&zero_div_zero::ZERO_DIVIDED_BY_ZERO),
]);
@ -1795,6 +1795,7 @@ pub fn register_renamed(ls: &mut rustc_lint::LintStore) {
ls.register_renamed("clippy::result_expect_used", "clippy::expect_used");
ls.register_renamed("clippy::for_loop_over_option", "clippy::for_loops_over_fallibles");
ls.register_renamed("clippy::for_loop_over_result", "clippy::for_loops_over_fallibles");
ls.register_renamed("clippy::identity_conversion", "clippy::useless_conversion");
}
// only exists to let the dogfood integration test works.

30
clippy_lints/src/identity_conversion.rs → clippy_lints/src/useless_conversion.rs
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@ -7,30 +7,36 @@ use rustc_lint::{LateContext, LateLintPass};
use rustc_session::{declare_tool_lint, impl_lint_pass};
declare_clippy_lint! {
/// **What it does:** Checks for always-identical `Into`/`From`/`IntoIter` conversions.
/// **What it does:** Checks for `Into`/`From`/`IntoIter` calls that useless converts
/// to the same type as caller.
///
/// **Why is this bad?** Redundant code.
///
/// **Known problems:** None.
///
/// **Example:**
///
/// ```rust
/// // Bad
/// // format!() returns a `String`
/// let s: String = format!("hello").into();
///
/// // Good
/// let s: String = format!("hello");
/// ```
pub IDENTITY_CONVERSION,
pub USELESS_CONVERSION,
complexity,
"using always-identical `Into`/`From`/`IntoIter` conversions"
"calls to `Into`/`From`/`IntoIter` that performs useless conversions to the same type"
}
#[derive(Default)]
pub struct IdentityConversion {
pub struct UselessConversion {
try_desugar_arm: Vec<HirId>,
}
impl_lint_pass!(IdentityConversion => [IDENTITY_CONVERSION]);
impl_lint_pass!(UselessConversion => [USELESS_CONVERSION]);
impl<'a, 'tcx> LateLintPass<'a, 'tcx> for IdentityConversion {
impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion {
fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, e: &'tcx Expr<'_>) {
if e.span.from_expansion() {
return;
@ -60,9 +66,9 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for IdentityConversion {
span_lint_and_sugg(
cx,
IDENTITY_CONVERSION,
USELESS_CONVERSION,
e.span,
"identical conversion",
"useless conversion",
"consider removing `.into()`",
sugg,
Applicability::MachineApplicable, // snippet
@ -76,9 +82,9 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for IdentityConversion {
let sugg = snippet(cx, args[0].span, "<expr>").into_owned();
span_lint_and_sugg(
cx,
IDENTITY_CONVERSION,
USELESS_CONVERSION,
e.span,
"identical conversion",
"useless conversion",
"consider removing `.into_iter()`",
sugg,
Applicability::MachineApplicable, // snippet
@ -99,9 +105,9 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for IdentityConversion {
format!("consider removing `{}()`", snippet(cx, path.span, "From::from"));
span_lint_and_sugg(
cx,
IDENTITY_CONVERSION,
USELESS_CONVERSION,
e.span,
"identical conversion",
"useless conversion",
&sugg_msg,
sugg,
Applicability::MachineApplicable, // snippet

14
src/lintlist/mod.rs
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@ -717,13 +717,6 @@ pub static ref ALL_LINTS: Vec<Lint> = vec![
deprecation: None,
module: "methods",
},
Lint {
name: "identity_conversion",
group: "complexity",
desc: "using always-identical `Into`/`From`/`IntoIter` conversions",
deprecation: None,
module: "identity_conversion",
},
Lint {
name: "identity_op",
group: "complexity",
@ -2418,6 +2411,13 @@ pub static ref ALL_LINTS: Vec<Lint> = vec![
deprecation: None,
module: "attrs",
},
Lint {
name: "useless_conversion",
group: "complexity",
desc: "calls to `Into`/`From`/`IntoIter` that performs useless conversions to the same type",
deprecation: None,
module: "useless_conversion",
},
Lint {
name: "useless_format",
group: "complexity",

4
tests/ui/identity_conversion.fixed → tests/ui/useless_conversion.fixed
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@ -1,6 +1,6 @@
// run-rustfix
#![deny(clippy::identity_conversion)]
#![deny(clippy::useless_conversion)]
fn test_generic<T: Copy>(val: T) -> T {
let _ = val;
@ -41,7 +41,7 @@ fn main() {
let _: String = "foo".into();
let _: String = From::from("foo");
let _ = String::from("foo");
#[allow(clippy::identity_conversion)]
#[allow(clippy::useless_conversion)]
{
let _: String = "foo".into();
let _ = String::from("foo");

4
tests/ui/identity_conversion.rs → tests/ui/useless_conversion.rs
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@ -1,6 +1,6 @@
// run-rustfix
#![deny(clippy::identity_conversion)]
#![deny(clippy::useless_conversion)]
fn test_generic<T: Copy>(val: T) -> T {
let _ = T::from(val);
@ -41,7 +41,7 @@ fn main() {
let _: String = "foo".into();
let _: String = From::from("foo");
let _ = String::from("foo");
#[allow(clippy::identity_conversion)]
#[allow(clippy::useless_conversion)]
{
let _: String = "foo".into();
let _ = String::from("foo");

46
tests/ui/identity_conversion.stderr → tests/ui/useless_conversion.stderr
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@ -1,65 +1,65 @@
error: identical conversion
--> $DIR/identity_conversion.rs:6:13
error: useless conversion
--> $DIR/useless_conversion.rs:6:13
|
LL | let _ = T::from(val);
| ^^^^^^^^^^^^ help: consider removing `T::from()`: `val`
|
note: the lint level is defined here
--> $DIR/identity_conversion.rs:3:9
--> $DIR/useless_conversion.rs:3:9
|
LL | #![deny(clippy::identity_conversion)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
LL | #![deny(clippy::useless_conversion)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
error: identical conversion
--> $DIR/identity_conversion.rs:7:5
error: useless conversion
--> $DIR/useless_conversion.rs:7:5
|
LL | val.into()
| ^^^^^^^^^^ help: consider removing `.into()`: `val`
error: identical conversion
--> $DIR/identity_conversion.rs:19:22
error: useless conversion
--> $DIR/useless_conversion.rs:19:22
|
LL | let _: i32 = 0i32.into();
| ^^^^^^^^^^^ help: consider removing `.into()`: `0i32`
error: identical conversion
--> $DIR/identity_conversion.rs:51:21
error: useless conversion
--> $DIR/useless_conversion.rs:51:21
|
LL | let _: String = "foo".to_string().into();
| ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into()`: `"foo".to_string()`
error: identical conversion
--> $DIR/identity_conversion.rs:52:21
error: useless conversion
--> $DIR/useless_conversion.rs:52:21
|
LL | let _: String = From::from("foo".to_string());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `From::from()`: `"foo".to_string()`
error: identical conversion
--> $DIR/identity_conversion.rs:53:13
error: useless conversion
--> $DIR/useless_conversion.rs:53:13
|
LL | let _ = String::from("foo".to_string());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `"foo".to_string()`
error: identical conversion
--> $DIR/identity_conversion.rs:54:13
error: useless conversion
--> $DIR/useless_conversion.rs:54:13
|
LL | let _ = String::from(format!("A: {:04}", 123));
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `format!("A: {:04}", 123)`
error: identical conversion
--> $DIR/identity_conversion.rs:55:13
error: useless conversion
--> $DIR/useless_conversion.rs:55:13
|
LL | let _ = "".lines().into_iter();
| ^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `"".lines()`
error: identical conversion
--> $DIR/identity_conversion.rs:56:13
error: useless conversion
--> $DIR/useless_conversion.rs:56:13
|
LL | let _ = vec![1, 2, 3].into_iter().into_iter();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `vec![1, 2, 3].into_iter()`
error: identical conversion
--> $DIR/identity_conversion.rs:57:21
error: useless conversion
--> $DIR/useless_conversion.rs:57:21
|
LL | let _: String = format!("Hello {}", "world").into();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into()`: `format!("Hello {}", "world")`