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Fix suggestion span on new_without_default (fixes #1407)

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This commit is contained in:
Manish Goregaokar 2016-12-29 11:19:32 -08:00
parent 5d78485a81
commit b8b54eb0d8
2 changed files with 12 additions and 12 deletions
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12
clippy_lints/src/new_without_default.rs
View File

@ -117,14 +117,14 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NewWithoutDefault {
let Some(default_trait_id) = get_trait_def_id(cx, &paths::DEFAULT_TRAIT),
!implements_trait(cx, self_ty, default_trait_id, Vec::new())
], {
if can_derive_default(self_ty, cx, default_trait_id) {
if let Some(sp) = can_derive_default(self_ty, cx, default_trait_id) {
span_lint_and_then(cx,
NEW_WITHOUT_DEFAULT_DERIVE, span,
&format!("you should consider deriving a \
`Default` implementation for `{}`",
self_ty),
|db| {
db.suggest_item_with_attr(cx, span, "try this", "#[derive(Default)]");
db.suggest_item_with_attr(cx, sp, "try this", "#[derive(Default)]");
});
} else {
span_lint_and_then(cx,
@ -151,17 +151,17 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NewWithoutDefault {
}
}
fn can_derive_default<'t, 'c>(ty: ty::Ty<'t>, cx: &LateContext<'c, 't>, default_trait_id: DefId) -> bool {
fn can_derive_default<'t, 'c>(ty: ty::Ty<'t>, cx: &LateContext<'c, 't>, default_trait_id: DefId) -> Option<Span> {
match ty.sty {
ty::TyAdt(adt_def, substs) if adt_def.is_struct() => {
for field in adt_def.all_fields() {
let f_ty = field.ty(cx.tcx, substs);
if !implements_trait(cx, f_ty, default_trait_id, Vec::new()) {
return false;
return None;
}
}
true
cx.tcx.map.span_if_local(adt_def.did)
},
_ => false,
_ => None,
}
}

12
tests/compile-fail/new_without_default.rs
View File

@ -5,23 +5,23 @@
#![deny(new_without_default, new_without_default_derive)]
pub struct Foo;
//~^HELP try this
//~^^SUGGESTION #[derive(Default)]
//~^^SUGGESTION pub struct Foo
impl Foo {
pub fn new() -> Foo { Foo }
//~^ERROR: you should consider deriving a `Default` implementation for `Foo`
//~|HELP try this
//~^^^SUGGESTION #[derive(Default)]
//~^^^SUGGESTION pub fn new
}
pub struct Bar;
//~^HELP try this
//~^^SUGGESTION #[derive(Default)]
//~^^SUGGESTION pub struct Bar
impl Bar {
pub fn new() -> Self { Bar }
//~^ERROR: you should consider deriving a `Default` implementation for `Bar`
//~|HELP try this
//~^^^SUGGESTION #[derive(Default)]
//~^^^SUGGESTION pub fn new
}
pub struct Ok;