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Merge pull request #3287 from JoshMcguigan/cmp_owned-2925

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cmp_owned false positive
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Oliver S̶c̶h̶n̶e̶i̶d̶e̶r Scherer 2018-10-09 10:01:31 +02:00 committed by GitHub
commit f6882ede4d
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3 changed files with 27 additions and 15 deletions
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20
clippy_lints/src/misc.rs
View file

@ -520,16 +520,17 @@ fn check_to_owned(cx: &LateContext<'_, '_>, expr: &Expr, other: &Expr) {
None => return,
};
// *arg impls PartialEq<other>
if !arg_ty
let deref_arg_impl_partial_eq_other = arg_ty
.builtin_deref(true)
.map_or(false, |tam| implements_trait(cx, tam.ty, partial_eq_trait_id, &[other_ty.into()]))
// arg impls PartialEq<*other>
&& !other_ty
.map_or(false, |tam| implements_trait(cx, tam.ty, partial_eq_trait_id, &[other_ty.into()]));
let arg_impl_partial_eq_deref_other = other_ty
.builtin_deref(true)
.map_or(false, |tam| implements_trait(cx, arg_ty, partial_eq_trait_id, &[tam.ty.into()]))
// arg impls PartialEq<other>
&& !implements_trait(cx, arg_ty, partial_eq_trait_id, &[other_ty.into()])
.map_or(false, |tam| implements_trait(cx, arg_ty, partial_eq_trait_id, &[tam.ty.into()]));
let arg_impl_partial_eq_other = implements_trait(cx, arg_ty, partial_eq_trait_id, &[other_ty.into()]);
if !deref_arg_impl_partial_eq_other
&& !arg_impl_partial_eq_deref_other
&& !arg_impl_partial_eq_other
{
return;
}
@ -559,10 +560,11 @@ fn check_to_owned(cx: &LateContext<'_, '_>, expr: &Expr, other: &Expr) {
}
}
}
let try_hint = if deref_arg_impl_partial_eq_other { format!("*{}", snip) } else { snip.to_string() };
db.span_suggestion_with_applicability(
expr.span,
"try",
snip.to_string(),
try_hint,
Applicability::MachineApplicable, // snippet
);
},

4
tests/ui/cmp_owned.rs
View file

@ -31,6 +31,10 @@ fn main() {
42.to_string() == "42";
Foo.to_owned() == Foo;
"abc".chars().filter(|c| c.to_owned() != 'X');
"abc".chars().filter(|c| *c != 'X');
}
struct Foo;

12
tests/ui/cmp_owned.stderr
View file

@ -31,10 +31,16 @@ error: this creates an owned instance just for comparison
| ^^^^^^^^^^^^^^ help: try: `Foo`
error: this creates an owned instance just for comparison
--> $DIR/cmp_owned.rs:40:9
--> $DIR/cmp_owned.rs:35:30
|
40 | self.to_owned() == *other
35 | "abc".chars().filter(|c| c.to_owned() != 'X');
| ^^^^^^^^^^^^ help: try: `*c`
error: this creates an owned instance just for comparison
--> $DIR/cmp_owned.rs:44:9
|
44 | self.to_owned() == *other
| ^^^^^^^^^^^^^^^ try calling implementing the comparison without allocating
error: aborting due to 6 previous errors
error: aborting due to 7 previous errors