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Exclude Fn traits

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This commit is contained in:
sinkuu 2017-10-08 18:04:45 +09:00
parent 2be6245179
commit fdc9a649ff
1 changed files with 8 additions and 3 deletions
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11
clippy_lints/src/needless_pass_by_value.rs
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@ -75,8 +75,13 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NeedlessPassByValue {
_ => return,
}
// Allow `Borrow` or functions to be taken by value
let borrow_trait = need!(get_trait_def_id(cx, &paths::BORROW_TRAIT));
let fn_trait = need!(cx.tcx.lang_items().fn_trait());
let fn_traits = [
need!(cx.tcx.lang_items().fn_trait()),
need!(cx.tcx.lang_items().fn_once_trait()),
need!(cx.tcx.lang_items().fn_mut_trait()),
];
let sized_trait = need!(cx.tcx.lang_items().sized_trait());
@ -119,7 +124,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NeedlessPassByValue {
{
// * Exclude a type that is specifically bounded by `Borrow`.
// * Exclude a type whose reference also fulfills its bound.
// (e.g. `std::borrow::Borrow`, `serde::Serialize`)
// (e.g. `std::convert::AsRef`, `serde::Serialize`)
let (implements_borrow_trait, all_borrowable_trait) = {
let preds = preds
.iter()
@ -143,7 +148,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NeedlessPassByValue {
!is_self(arg),
!ty.is_mutable_pointer(),
!is_copy(cx, ty),
!implements_trait(cx, ty, fn_trait, &[]),
!fn_traits.iter().any(|&t| implements_trait(cx, ty, t, &[])),
!implements_borrow_trait,
!all_borrowable_trait,