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Auto merge of #12259 - GuillaumeGomez:multiple-bound-locations, r=llogiq

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Add new `multiple_bound_locations` lint

Fixes #7181.

r? `@llogiq`

changelog: Add new `multiple_bound_locations` lint
This commit is contained in:
bors 2024-02-24 13:43:34 +00:00
commit a2c1d565e5
12 changed files with 259 additions and 49 deletions
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1
CHANGELOG.md
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@ -5430,6 +5430,7 @@ Released 2018-09-13
[`modulo_arithmetic`]: https://rust-lang.github.io/rust-clippy/master/index.html#modulo_arithmetic
[`modulo_one`]: https://rust-lang.github.io/rust-clippy/master/index.html#modulo_one
[`multi_assignments`]: https://rust-lang.github.io/rust-clippy/master/index.html#multi_assignments
[`multiple_bound_locations`]: https://rust-lang.github.io/rust-clippy/master/index.html#multiple_bound_locations
[`multiple_crate_versions`]: https://rust-lang.github.io/rust-clippy/master/index.html#multiple_crate_versions
[`multiple_inherent_impl`]: https://rust-lang.github.io/rust-clippy/master/index.html#multiple_inherent_impl
[`multiple_unsafe_ops_per_block`]: https://rust-lang.github.io/rust-clippy/master/index.html#multiple_unsafe_ops_per_block

1
clippy_lints/src/declared_lints.rs
View File

@ -499,6 +499,7 @@ pub(crate) static LINTS: &[&crate::LintInfo] = &[
crate::module_style::MOD_MODULE_FILES_INFO,
crate::module_style::SELF_NAMED_MODULE_FILES_INFO,
crate::multi_assignments::MULTI_ASSIGNMENTS_INFO,
crate::multiple_bound_locations::MULTIPLE_BOUND_LOCATIONS_INFO,
crate::multiple_unsafe_ops_per_block::MULTIPLE_UNSAFE_OPS_PER_BLOCK_INFO,
crate::mut_key::MUTABLE_KEY_TYPE_INFO,
crate::mut_mut::MUT_MUT_INFO,

2
clippy_lints/src/lib.rs
View File

@ -231,6 +231,7 @@ mod missing_trait_methods;
mod mixed_read_write_in_expression;
mod module_style;
mod multi_assignments;
mod multiple_bound_locations;
mod multiple_unsafe_ops_per_block;
mod mut_key;
mod mut_mut;
@ -1116,6 +1117,7 @@ pub fn register_lints(store: &mut rustc_lint::LintStore, conf: &'static Conf) {
});
store.register_late_pass(move |_| Box::new(incompatible_msrv::IncompatibleMsrv::new(msrv())));
store.register_late_pass(|_| Box::new(to_string_trait_impl::ToStringTraitImpl));
store.register_early_pass(|| Box::new(multiple_bound_locations::MultipleBoundLocations));
// add lints here, do not remove this comment, it's used in `new_lint`
}

84
clippy_lints/src/multiple_bound_locations.rs Normal file
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@ -0,0 +1,84 @@
use rustc_ast::visit::FnKind;
use rustc_ast::{NodeId, WherePredicate};
use rustc_data_structures::fx::FxHashMap;
use rustc_lint::{EarlyContext, EarlyLintPass};
use rustc_session::declare_lint_pass;
use rustc_span::Span;
use clippy_utils::diagnostics::span_lint;
use clippy_utils::source::snippet_opt;
declare_clippy_lint! {
/// ### What it does
/// Check if a generic is defined both in the bound predicate and in the `where` clause.
///
/// ### Why is this bad?
/// It can be confusing for developers when seeing bounds for a generic in multiple places.
///
/// ### Example
/// ```no_run
/// fn ty<F: std::fmt::Debug>(a: F)
/// where
/// F: Sized,
/// {}
/// ```
/// Use instead:
/// ```no_run
/// fn ty<F>(a: F)
/// where
/// F: Sized + std::fmt::Debug,
/// {}
/// ```
#[clippy::version = "1.77.0"]
pub MULTIPLE_BOUND_LOCATIONS,
suspicious,
"defining generic bounds in multiple locations"
}
declare_lint_pass!(MultipleBoundLocations => [MULTIPLE_BOUND_LOCATIONS]);
impl EarlyLintPass for MultipleBoundLocations {
fn check_fn(&mut self, cx: &EarlyContext<'_>, kind: FnKind<'_>, _: Span, _: NodeId) {
if let FnKind::Fn(_, _, _, _, generics, _) = kind
&& !generics.params.is_empty()
&& !generics.where_clause.predicates.is_empty()
{
let mut generic_params_with_bounds = FxHashMap::default();
for param in &generics.params {
if !param.bounds.is_empty() {
generic_params_with_bounds.insert(param.ident.name.as_str(), param.ident.span);
}
}
for clause in &generics.where_clause.predicates {
match clause {
WherePredicate::BoundPredicate(pred) => {
if (!pred.bound_generic_params.is_empty() || !pred.bounds.is_empty())
&& let Some(name) = snippet_opt(cx, pred.bounded_ty.span)
&& let Some(bound_span) = generic_params_with_bounds.get(name.as_str())
{
emit_lint(cx, *bound_span, pred.bounded_ty.span);
}
},
WherePredicate::RegionPredicate(pred) => {
if !pred.bounds.is_empty()
&& let Some(bound_span) = generic_params_with_bounds.get(&pred.lifetime.ident.name.as_str())
{
emit_lint(cx, *bound_span, pred.lifetime.ident.span);
}
},
WherePredicate::EqPredicate(_) => {},
}
}
}
}
}
fn emit_lint(cx: &EarlyContext<'_>, bound_span: Span, where_span: Span) {
span_lint(
cx,
MULTIPLE_BOUND_LOCATIONS,
vec![bound_span, where_span],
"bound is defined in more than one place",
);
}

60
tests/ui/multiple_bound_locations.rs Normal file
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@ -0,0 +1,60 @@
#![warn(clippy::multiple_bound_locations)]
fn ty<F: std::fmt::Debug>(a: F)
//~^ ERROR: bound is defined in more than one place
where
F: Sized,
{
}
fn lifetime<'a, 'b: 'a, 'c>(a: &'b str, b: &'a str, c: &'c str)
//~^ ERROR: bound is defined in more than one place
where
'b: 'c,
{
}
fn ty_pred<F: Sized>()
//~^ ERROR: bound is defined in more than one place
where
for<'a> F: Send + 'a,
{
}
struct B;
impl B {
fn ty<F: std::fmt::Debug>(a: F)
//~^ ERROR: bound is defined in more than one place
where
F: Sized,
{
}
fn lifetime<'a, 'b: 'a, 'c>(a: &'b str, b: &'a str, c: &'c str)
//~^ ERROR: bound is defined in more than one place
where
'b: 'c,
{
}
fn ty_pred<F: Sized>()
//~^ ERROR: bound is defined in more than one place
where
for<'a> F: Send + 'a,
{
}
}
struct C<F>(F);
impl<F> C<F> {
fn foo(_f: F) -> Self
where
F: std::fmt::Display,
{
todo!()
}
}
fn main() {}

59
tests/ui/multiple_bound_locations.stderr Normal file
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@ -0,0 +1,59 @@
error: bound is defined in more than one place
--> tests/ui/multiple_bound_locations.rs:3:7
|
LL | fn ty<F: std::fmt::Debug>(a: F)
| ^
...
LL | F: Sized,
| ^
|
= note: `-D clippy::multiple-bound-locations` implied by `-D warnings`
= help: to override `-D warnings` add `#[allow(clippy::multiple_bound_locations)]`
error: bound is defined in more than one place
--> tests/ui/multiple_bound_locations.rs:10:17
|
LL | fn lifetime<'a, 'b: 'a, 'c>(a: &'b str, b: &'a str, c: &'c str)
| ^^
...
LL | 'b: 'c,
| ^^
error: bound is defined in more than one place
--> tests/ui/multiple_bound_locations.rs:17:12
|
LL | fn ty_pred<F: Sized>()
| ^
...
LL | for<'a> F: Send + 'a,
| ^
error: bound is defined in more than one place
--> tests/ui/multiple_bound_locations.rs:27:11
|
LL | fn ty<F: std::fmt::Debug>(a: F)
| ^
...
LL | F: Sized,
| ^
error: bound is defined in more than one place
--> tests/ui/multiple_bound_locations.rs:34:21
|
LL | fn lifetime<'a, 'b: 'a, 'c>(a: &'b str, b: &'a str, c: &'c str)
| ^^
...
LL | 'b: 'c,
| ^^
error: bound is defined in more than one place
--> tests/ui/multiple_bound_locations.rs:41:16
|
LL | fn ty_pred<F: Sized>()
| ^
...
LL | for<'a> F: Send + 'a,
| ^
error: aborting due to 6 previous errors

1
tests/ui/trait_duplication_in_bounds_unfixable.rs
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@ -1,4 +1,5 @@
#![deny(clippy::trait_duplication_in_bounds)]
#![allow(clippy::multiple_bound_locations)]
use std::collections::BTreeMap;
use std::ops::{Add, AddAssign, Div, DivAssign, Mul, MulAssign, Sub, SubAssign};

16
tests/ui/trait_duplication_in_bounds_unfixable.stderr
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@ -1,5 +1,5 @@
error: this trait bound is already specified in the where clause
--> tests/ui/trait_duplication_in_bounds_unfixable.rs:6:15
--> tests/ui/trait_duplication_in_bounds_unfixable.rs:7:15
|
LL | fn bad_foo<T: Clone + Default, Z: Copy>(arg0: T, arg1: Z)
| ^^^^^
@ -12,7 +12,7 @@ LL | #![deny(clippy::trait_duplication_in_bounds)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: this trait bound is already specified in the where clause
--> tests/ui/trait_duplication_in_bounds_unfixable.rs:6:23
--> tests/ui/trait_duplication_in_bounds_unfixable.rs:7:23
|
LL | fn bad_foo<T: Clone + Default, Z: Copy>(arg0: T, arg1: Z)
| ^^^^^^^
@ -20,7 +20,7 @@ LL | fn bad_foo<T: Clone + Default, Z: Copy>(arg0: T, arg1: Z)
= help: consider removing this trait bound
error: this trait bound is already specified in trait declaration
--> tests/ui/trait_duplication_in_bounds_unfixable.rs:37:15
--> tests/ui/trait_duplication_in_bounds_unfixable.rs:38:15
|
LL | Self: Default;
| ^^^^^^^
@ -28,7 +28,7 @@ LL | Self: Default;
= help: consider removing this trait bound
error: this trait bound is already specified in trait declaration
--> tests/ui/trait_duplication_in_bounds_unfixable.rs:52:15
--> tests/ui/trait_duplication_in_bounds_unfixable.rs:53:15
|
LL | Self: Default + Clone;
| ^^^^^^^
@ -36,7 +36,7 @@ LL | Self: Default + Clone;
= help: consider removing this trait bound
error: this trait bound is already specified in trait declaration
--> tests/ui/trait_duplication_in_bounds_unfixable.rs:59:15
--> tests/ui/trait_duplication_in_bounds_unfixable.rs:60:15
|
LL | Self: Default + Clone;
| ^^^^^^^
@ -44,7 +44,7 @@ LL | Self: Default + Clone;
= help: consider removing this trait bound
error: this trait bound is already specified in trait declaration
--> tests/ui/trait_duplication_in_bounds_unfixable.rs:59:25
--> tests/ui/trait_duplication_in_bounds_unfixable.rs:60:25
|
LL | Self: Default + Clone;
| ^^^^^
@ -52,7 +52,7 @@ LL | Self: Default + Clone;
= help: consider removing this trait bound
error: this trait bound is already specified in trait declaration
--> tests/ui/trait_duplication_in_bounds_unfixable.rs:64:15
--> tests/ui/trait_duplication_in_bounds_unfixable.rs:65:15
|
LL | Self: Default;
| ^^^^^^^
@ -60,7 +60,7 @@ LL | Self: Default;
= help: consider removing this trait bound
error: this trait bound is already specified in trait declaration
--> tests/ui/trait_duplication_in_bounds_unfixable.rs:100:15
--> tests/ui/trait_duplication_in_bounds_unfixable.rs:101:15
|
LL | Self: Iterator<Item = Foo>,
| ^^^^^^^^^^^^^^^^^^^^

2
tests/ui/type_repetition_in_bounds.rs
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@ -1,5 +1,5 @@
#![deny(clippy::type_repetition_in_bounds)]
#![allow(clippy::extra_unused_type_parameters)]
#![allow(clippy::extra_unused_type_parameters, clippy::multiple_bound_locations)]
use serde::Deserialize;
use std::ops::{Add, AddAssign, Div, DivAssign, Mul, MulAssign, Sub, SubAssign};

1
tests/ui/unnecessary_cast.fixed
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@ -2,6 +2,7 @@
#![warn(clippy::unnecessary_cast)]
#![allow(
clippy::borrow_as_ptr,
clippy::multiple_bound_locations,
clippy::no_effect,
clippy::nonstandard_macro_braces,
clippy::unnecessary_operation,

1
tests/ui/unnecessary_cast.rs
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@ -2,6 +2,7 @@
#![warn(clippy::unnecessary_cast)]
#![allow(
clippy::borrow_as_ptr,
clippy::multiple_bound_locations,
clippy::no_effect,
clippy::nonstandard_macro_braces,
clippy::unnecessary_operation,

80
tests/ui/unnecessary_cast.stderr
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@ -1,5 +1,5 @@
error: casting raw pointers to the same type and constness is unnecessary (`*const T` -> `*const T`)
--> tests/ui/unnecessary_cast.rs:18:5
--> tests/ui/unnecessary_cast.rs:19:5
|
LL | ptr as *const T
| ^^^^^^^^^^^^^^^ help: try: `ptr`
@ -8,235 +8,235 @@ LL | ptr as *const T
= help: to override `-D warnings` add `#[allow(clippy::unnecessary_cast)]`
error: casting integer literal to `i32` is unnecessary
--> tests/ui/unnecessary_cast.rs:53:5
--> tests/ui/unnecessary_cast.rs:54:5
|
LL | 1i32 as i32;
| ^^^^^^^^^^^ help: try: `1_i32`
error: casting float literal to `f32` is unnecessary
--> tests/ui/unnecessary_cast.rs:54:5
--> tests/ui/unnecessary_cast.rs:55:5
|
LL | 1f32 as f32;
| ^^^^^^^^^^^ help: try: `1_f32`
error: casting to the same type is unnecessary (`bool` -> `bool`)
--> tests/ui/unnecessary_cast.rs:55:5
--> tests/ui/unnecessary_cast.rs:56:5
|
LL | false as bool;
| ^^^^^^^^^^^^^ help: try: `false`
error: casting integer literal to `i32` is unnecessary
--> tests/ui/unnecessary_cast.rs:58:5
--> tests/ui/unnecessary_cast.rs:59:5
|
LL | -1_i32 as i32;
| ^^^^^^^^^^^^^ help: try: `-1_i32`
error: casting integer literal to `i32` is unnecessary
--> tests/ui/unnecessary_cast.rs:59:5
--> tests/ui/unnecessary_cast.rs:60:5
|
LL | - 1_i32 as i32;
| ^^^^^^^^^^^^^^ help: try: `- 1_i32`
error: casting float literal to `f32` is unnecessary
--> tests/ui/unnecessary_cast.rs:60:5
--> tests/ui/unnecessary_cast.rs:61:5
|
LL | -1f32 as f32;
| ^^^^^^^^^^^^ help: try: `-1_f32`
error: casting integer literal to `i32` is unnecessary
--> tests/ui/unnecessary_cast.rs:61:5
--> tests/ui/unnecessary_cast.rs:62:5
|
LL | 1_i32 as i32;
| ^^^^^^^^^^^^ help: try: `1_i32`
error: casting float literal to `f32` is unnecessary
--> tests/ui/unnecessary_cast.rs:62:5
--> tests/ui/unnecessary_cast.rs:63:5
|
LL | 1_f32 as f32;
| ^^^^^^^^^^^^ help: try: `1_f32`
error: casting raw pointers to the same type and constness is unnecessary (`*const u8` -> `*const u8`)
--> tests/ui/unnecessary_cast.rs:64:22
--> tests/ui/unnecessary_cast.rs:65:22
|
LL | let _: *mut u8 = [1u8, 2].as_ptr() as *const u8 as *mut u8;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `[1u8, 2].as_ptr()`
error: casting raw pointers to the same type and constness is unnecessary (`*const u8` -> `*const u8`)
--> tests/ui/unnecessary_cast.rs:66:5
--> tests/ui/unnecessary_cast.rs:67:5
|
LL | [1u8, 2].as_ptr() as *const u8;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `[1u8, 2].as_ptr()`
error: casting raw pointers to the same type and constness is unnecessary (`*mut u8` -> `*mut u8`)
--> tests/ui/unnecessary_cast.rs:68:5
--> tests/ui/unnecessary_cast.rs:69:5
|
LL | [1u8, 2].as_mut_ptr() as *mut u8;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `[1u8, 2].as_mut_ptr()`
error: casting raw pointers to the same type and constness is unnecessary (`*const u32` -> `*const u32`)
--> tests/ui/unnecessary_cast.rs:79:5
--> tests/ui/unnecessary_cast.rs:80:5
|
LL | owo::<u32>([1u32].as_ptr()) as *const u32;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `owo::<u32>([1u32].as_ptr())`
error: casting raw pointers to the same type and constness is unnecessary (`*const u8` -> `*const u8`)
--> tests/ui/unnecessary_cast.rs:80:5
--> tests/ui/unnecessary_cast.rs:81:5
|
LL | uwu::<u32, u8>([1u32].as_ptr()) as *const u8;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `uwu::<u32, u8>([1u32].as_ptr())`
error: casting raw pointers to the same type and constness is unnecessary (`*const u32` -> `*const u32`)
--> tests/ui/unnecessary_cast.rs:82:5
--> tests/ui/unnecessary_cast.rs:83:5
|
LL | uwu::<u32, u32>([1u32].as_ptr()) as *const u32;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `uwu::<u32, u32>([1u32].as_ptr())`
error: casting to the same type is unnecessary (`u32` -> `u32`)
--> tests/ui/unnecessary_cast.rs:117:5
--> tests/ui/unnecessary_cast.rs:118:5
|
LL | aaa() as u32;
| ^^^^^^^^^^^^ help: try: `aaa()`
error: casting to the same type is unnecessary (`u32` -> `u32`)
--> tests/ui/unnecessary_cast.rs:119:5
--> tests/ui/unnecessary_cast.rs:120:5
|
LL | aaa() as u32;
| ^^^^^^^^^^^^ help: try: `aaa()`
error: casting integer literal to `f32` is unnecessary
--> tests/ui/unnecessary_cast.rs:155:9
--> tests/ui/unnecessary_cast.rs:156:9
|
LL | 100 as f32;
| ^^^^^^^^^^ help: try: `100_f32`
error: casting integer literal to `f64` is unnecessary
--> tests/ui/unnecessary_cast.rs:156:9
--> tests/ui/unnecessary_cast.rs:157:9
|
LL | 100 as f64;
| ^^^^^^^^^^ help: try: `100_f64`
error: casting integer literal to `f64` is unnecessary
--> tests/ui/unnecessary_cast.rs:157:9
--> tests/ui/unnecessary_cast.rs:158:9
|
LL | 100_i32 as f64;
| ^^^^^^^^^^^^^^ help: try: `100_f64`
error: casting integer literal to `f32` is unnecessary
--> tests/ui/unnecessary_cast.rs:158:17
--> tests/ui/unnecessary_cast.rs:159:17
|
LL | let _ = -100 as f32;
| ^^^^^^^^^^^ help: try: `-100_f32`
error: casting integer literal to `f64` is unnecessary
--> tests/ui/unnecessary_cast.rs:159:17
--> tests/ui/unnecessary_cast.rs:160:17
|
LL | let _ = -100 as f64;
| ^^^^^^^^^^^ help: try: `-100_f64`
error: casting integer literal to `f64` is unnecessary
--> tests/ui/unnecessary_cast.rs:160:17
--> tests/ui/unnecessary_cast.rs:161:17
|
LL | let _ = -100_i32 as f64;
| ^^^^^^^^^^^^^^^ help: try: `-100_f64`
error: casting float literal to `f32` is unnecessary
--> tests/ui/unnecessary_cast.rs:161:9
--> tests/ui/unnecessary_cast.rs:162:9
|
LL | 100. as f32;
| ^^^^^^^^^^^ help: try: `100_f32`
error: casting float literal to `f64` is unnecessary
--> tests/ui/unnecessary_cast.rs:162:9
--> tests/ui/unnecessary_cast.rs:163:9
|
LL | 100. as f64;
| ^^^^^^^^^^^ help: try: `100_f64`
error: casting integer literal to `u32` is unnecessary
--> tests/ui/unnecessary_cast.rs:174:9
--> tests/ui/unnecessary_cast.rs:175:9
|
LL | 1 as u32;
| ^^^^^^^^ help: try: `1_u32`
error: casting integer literal to `i32` is unnecessary
--> tests/ui/unnecessary_cast.rs:175:9
--> tests/ui/unnecessary_cast.rs:176:9
|
LL | 0x10 as i32;
| ^^^^^^^^^^^ help: try: `0x10_i32`
error: casting integer literal to `usize` is unnecessary
--> tests/ui/unnecessary_cast.rs:176:9
--> tests/ui/unnecessary_cast.rs:177:9
|
LL | 0b10 as usize;
| ^^^^^^^^^^^^^ help: try: `0b10_usize`
error: casting integer literal to `u16` is unnecessary
--> tests/ui/unnecessary_cast.rs:177:9
--> tests/ui/unnecessary_cast.rs:178:9
|
LL | 0o73 as u16;
| ^^^^^^^^^^^ help: try: `0o73_u16`
error: casting integer literal to `u32` is unnecessary
--> tests/ui/unnecessary_cast.rs:178:9
--> tests/ui/unnecessary_cast.rs:179:9
|
LL | 1_000_000_000 as u32;
| ^^^^^^^^^^^^^^^^^^^^ help: try: `1_000_000_000_u32`
error: casting float literal to `f64` is unnecessary
--> tests/ui/unnecessary_cast.rs:180:9
--> tests/ui/unnecessary_cast.rs:181:9
|
LL | 1.0 as f64;
| ^^^^^^^^^^ help: try: `1.0_f64`
error: casting float literal to `f32` is unnecessary
--> tests/ui/unnecessary_cast.rs:181:9
--> tests/ui/unnecessary_cast.rs:182:9
|
LL | 0.5 as f32;
| ^^^^^^^^^^ help: try: `0.5_f32`
error: casting integer literal to `i32` is unnecessary
--> tests/ui/unnecessary_cast.rs:185:17
--> tests/ui/unnecessary_cast.rs:186:17
|
LL | let _ = -1 as i32;
| ^^^^^^^^^ help: try: `-1_i32`
error: casting float literal to `f32` is unnecessary
--> tests/ui/unnecessary_cast.rs:186:17
--> tests/ui/unnecessary_cast.rs:187:17
|
LL | let _ = -1.0 as f32;
| ^^^^^^^^^^^ help: try: `-1.0_f32`
error: casting to the same type is unnecessary (`i32` -> `i32`)
--> tests/ui/unnecessary_cast.rs:192:18
--> tests/ui/unnecessary_cast.rs:193:18
|
LL | let _ = &(x as i32);
| ^^^^^^^^^^ help: try: `{ x }`
error: casting integer literal to `i32` is unnecessary
--> tests/ui/unnecessary_cast.rs:198:22
--> tests/ui/unnecessary_cast.rs:199:22
|
LL | let _: i32 = -(1) as i32;
| ^^^^^^^^^^^ help: try: `-1_i32`
error: casting integer literal to `i64` is unnecessary
--> tests/ui/unnecessary_cast.rs:200:22
--> tests/ui/unnecessary_cast.rs:201:22
|
LL | let _: i64 = -(1) as i64;
| ^^^^^^^^^^^ help: try: `-1_i64`
error: casting float literal to `f64` is unnecessary
--> tests/ui/unnecessary_cast.rs:207:22
--> tests/ui/unnecessary_cast.rs:208:22
|
LL | let _: f64 = (-8.0 as f64).exp();
| ^^^^^^^^^^^^^ help: try: `(-8.0_f64)`
error: casting float literal to `f64` is unnecessary
--> tests/ui/unnecessary_cast.rs:209:23
--> tests/ui/unnecessary_cast.rs:210:23
|
LL | let _: f64 = -(8.0 as f64).exp(); // should suggest `-8.0_f64.exp()` here not to change code behavior
| ^^^^^^^^^^^^ help: try: `8.0_f64`
error: casting to the same type is unnecessary (`f32` -> `f32`)
--> tests/ui/unnecessary_cast.rs:217:20
--> tests/ui/unnecessary_cast.rs:218:20
|
LL | let _num = foo() as f32;
| ^^^^^^^^^^^^ help: try: `foo()`