noop_method_call: fix and improve derive suggestions
#134903
Conversation
rustbot
added
S-waiting-on-review
| LL - v.clone(); | ||
| LL + v; | ||
| | | ||
| help: if you meant to clone `non_clone_types::DifferentlyConditionalClone<PlainType<u8>>`, implement `Clone` for it |
There was a problem hiding this comment.
I'm not sure why this derive below is being suggested, since the bound is T: Default instead of T: Clone here.
There was a problem hiding this comment.
It looks like the problem is that cx.tcx.predicates_of(trait_impl_id) is actually empty in this case.
There was a problem hiding this comment.
Same with this, you can modify
.derive_suggestion = if you meant to clone `{$orig_ty}`, implement `Clone` for it
to be
.derive_suggestion = if you meant to clone `{$non_clone_ty}`, implement `Clone` for it
| LL - v.clone(); | ||
| LL + v; | ||
| | | ||
| help: if you meant to clone `non_clone_types::DifferentlyConditionalClone<PlainType<u8>>`, implement `Clone` for it |
There was a problem hiding this comment.
Same with this, you can modify
.derive_suggestion = if you meant to clone `{$orig_ty}`, implement `Clone` for it
to be
.derive_suggestion = if you meant to clone `{$non_clone_ty}`, implement `Clone` for it
… to derive on generic argument
cyrgani
force-pushed
the
noop-method-call-clone-derive
branch
from
7437998 to
ad93cb8
Compare
| ty::Adt(def, args) => { | ||
| if def.did().is_local() { | ||
| Some(cx.tcx.def_span(def.did()).shrink_to_lo()) | ||
| } else if let Some(trait_impl_id) = cx.tcx.impl_of_method(i.def_id()) { |
There was a problem hiding this comment.
i.def_id() is the wrong DefId, because it points to the Clone implementation for &T in core. How can I resolve the definition of T::clone (where T is orig_ty) instead?
There was a problem hiding this comment.
I think you can use let args = tcx.mk_args(&[ty::GenericArg::from(orig_ty)]); for a new ty::Instance::try_resolve(cx.tcx, cx.typing_env(), did, args) call.
| LL + let non_borrow_type_borrow: &PlainType<u32> = non_borrow_type; | ||
| | | ||
| help: if you meant to clone `PlainType<u32>`, implement `Clone` for it | ||
| help: if you meant to clone `PlainType<u32>`, implement `Clone` for `PlainType<u32>` |
There was a problem hiding this comment.
It would be ideal if we didn't repeat the type when orig_ty == non_clone_ty.
|
☔ The latest upstream changes (presumably #136751) made this pull request unmergeable. Please resolve the merge conflicts. |
|
Triage: comment is not addressed and need rebase |
rustbot
added
S-waiting-on-author
5 participants
Fixes #134471.
If
&Tis being cloned andTis not crate-local, stop suggesting#[derive(Clone)]forTin the message.If
&T<U>is being cloned andTis not crate-local, but implementsCloneifU: Clone, then try suggesting#[derive(Clone)]forUif it is local.r? estebank