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new_ret_no_self corrected panic and added test stderr

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This commit is contained in:
Josh Mcguigan 2018-10-03 03:55:31 -07:00
parent eb854b233c
commit 13ce96c4bf
3 changed files with 65 additions and 45 deletions
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16
clippy_lints/src/methods/mod.rs
View file

@ -931,13 +931,15 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Pass {
}
}
let ret_ty = return_ty(cx, implitem.id);
if name == "new" &&
!ret_ty.walk().any(|t| same_tys(cx, t, ty)) {
span_lint(cx,
NEW_RET_NO_SELF,
implitem.span,
"methods called `new` usually return `Self`");
if let hir::ImplItemKind::Method(ref sig, id) = implitem.node {
let ret_ty = return_ty(cx, implitem.id);
if name == "new" &&
!ret_ty.walk().any(|t| same_tys(cx, t, ty)) {
span_lint(cx,
NEW_RET_NO_SELF,
implitem.span,
"methods called `new` usually return `Self`");
}
}
}
}

76
tests/ui/new_ret_no_self.rs
View file

@ -5,44 +5,44 @@
fn main(){}
//trait R {
// type Item;
//}
//
//struct S;
//
//impl R for S {
// type Item = Self;
//}
//
//impl S {
// // should not trigger the lint
// pub fn new() -> impl R<Item = Self> {
// S
// }
//}
//
//struct S2;
//
//impl R for S2 {
// type Item = Self;
//}
//
//impl S2 {
// // should not trigger the lint
// pub fn new(_: String) -> impl R<Item = Self> {
// S2
// }
//}
//
//struct T;
//
//impl T {
// // should not trigger lint
// pub fn new() -> Self {
// unimplemented!();
// }
//}
trait R {
type Item;
}
struct S;
impl R for S {
type Item = Self;
}
impl S {
// should not trigger the lint
pub fn new() -> impl R<Item = Self> {
S
}
}
struct S2;
impl R for S2 {
type Item = Self;
}
impl S2 {
// should not trigger the lint
pub fn new(_: String) -> impl R<Item = Self> {
S2
}
}
struct T;
impl T {
// should not trigger lint
pub fn new() -> Self {
unimplemented!();
}
}
struct U;

18
tests/ui/new_ret_no_self.stderr Normal file
View file

@ -0,0 +1,18 @@
error: methods called `new` usually return `Self`
--> $DIR/new_ret_no_self.rs:51:5
|
51 | / pub fn new() -> u32 {
52 | | unimplemented!();
53 | | }
| |_____^
error: methods called `new` usually return `Self`
--> $DIR/new_ret_no_self.rs:60:5
|
60 | / pub fn new(_: String) -> u32 {
61 | | unimplemented!();
62 | | }
| |_____^
error: aborting due to 2 previous errors