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https://github.com/rust-lang/rust.git
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Suggest box/pin/arc ing receiver on method calls
This commit is contained in:
Esteban Küber
parent
2917eda69d
commit
6f2d8a018e
@ -973,7 +973,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
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error: MethodError<'tcx>,
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) {
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let rcvr = &args[0];
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let try_alt_rcvr = |err: &mut DiagnosticBuilder<'_>, new_rcvr_t| {
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let try_alt_rcvr = |err: &mut DiagnosticBuilder<'_>, new_rcvr_t, pre: &str, post: &str| {
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if let Some(new_rcvr_t) = new_rcvr_t {
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if let Ok(pick) = self.lookup_probe(
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span,
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@ -986,11 +986,24 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
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// Make sure the method is defined for the *actual* receiver:
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// we don't want to treat `Box<Self>` as a receiver if
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// it only works because of an autoderef to `&self`
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if pick.autoderefs == 0 {
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if pick.autoderefs == 0
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// We don't want to suggest a container type when the missing method is
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// `.clone()`, otherwise we'd suggest `Arc::new(foo).clone()`, which is
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// far from what the user really wants.
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&& Some(pick.item.container.id()) != self.tcx.lang_items().clone_trait()
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{
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err.span_label(
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pick.item.ident.span,
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&format!("the method is available for `{}` here", new_rcvr_t),
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);
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err.multipart_suggestion(
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"consider wrapping the receiver expression with the appropriate type",
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vec![
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(rcvr.span.shrink_to_lo(), format!("{}({}", pre, post)),
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(rcvr.span.shrink_to_hi(), ")".to_string()),
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],
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Applicability::MaybeIncorrect,
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);
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}
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}
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}
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@ -1008,10 +1021,20 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
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// Try alternative arbitrary self types that could fulfill this call.
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// FIXME: probe for all types that *could* be arbitrary self-types, not
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// just this list.
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try_alt_rcvr(&mut err, self.tcx.mk_lang_item(rcvr_t, LangItem::OwnedBox));
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try_alt_rcvr(&mut err, self.tcx.mk_lang_item(rcvr_t, LangItem::Pin));
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try_alt_rcvr(&mut err, self.tcx.mk_diagnostic_item(rcvr_t, sym::Arc));
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try_alt_rcvr(&mut err, self.tcx.mk_diagnostic_item(rcvr_t, sym::Rc));
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for (rcvr_t, post) in &[
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(rcvr_t, ""),
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(self.tcx.mk_mut_ref(&ty::ReErased, rcvr_t), "&mut "),
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(self.tcx.mk_imm_ref(&ty::ReErased, rcvr_t), "&"),
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] {
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for (rcvr_t, pre) in &[
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(self.tcx.mk_lang_item(rcvr_t, LangItem::OwnedBox), "Box::new"),
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(self.tcx.mk_lang_item(rcvr_t, LangItem::Pin), "Pin::new"),
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(self.tcx.mk_diagnostic_item(rcvr_t, sym::Arc), "Arc::new"),
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(self.tcx.mk_diagnostic_item(rcvr_t, sym::Rc), "Rc::new"),
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] {
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try_alt_rcvr(&mut err, *rcvr_t, pre, post);
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}
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}
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}
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err.emit();
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}
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@ -45,6 +45,7 @@ pub struct MethodCallee<'tcx> {
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pub sig: ty::FnSig<'tcx>,
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}
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#[derive(Debug)]
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pub enum MethodError<'tcx> {
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// Did not find an applicable method, but we did find various near-misses that may work.
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NoMatch(NoMatchData<'tcx>),
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@ -66,6 +67,7 @@ pub enum MethodError<'tcx> {
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// Contains a list of static methods that may apply, a list of unsatisfied trait predicates which
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// could lead to matches if satisfied, and a list of not-in-scope traits which may work.
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#[derive(Debug)]
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pub struct NoMatchData<'tcx> {
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pub static_candidates: Vec<CandidateSource>,
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pub unsatisfied_predicates: Vec<(ty::Predicate<'tcx>, Option<ty::Predicate<'tcx>>)>,
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47
src/test/ui/async-await/pin-needed-to-poll.rs
Normal file
47
src/test/ui/async-await/pin-needed-to-poll.rs
Normal file
@ -0,0 +1,47 @@
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use std::{
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future::Future,
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pin::Pin,
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task::{Context, Poll},
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};
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struct Sleep;
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impl Future for Sleep {
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type Output = ();
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fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
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Poll::Ready(())
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}
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}
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impl Drop for Sleep {
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fn drop(&mut self) {}
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}
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fn sleep() -> Sleep {
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Sleep
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}
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struct MyFuture {
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sleep: Sleep,
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}
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impl MyFuture {
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fn new() -> Self {
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Self {
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sleep: sleep(),
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}
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}
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}
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impl Future for MyFuture {
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type Output = ();
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fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
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self.sleep.poll(cx)
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//~^ ERROR no method named `poll` found for struct `Sleep` in the current scope
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}
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}
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fn main() {}
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25
src/test/ui/async-await/pin-needed-to-poll.stderr
Normal file
25
src/test/ui/async-await/pin-needed-to-poll.stderr
Normal file
@ -0,0 +1,25 @@
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error[E0599]: no method named `poll` found for struct `Sleep` in the current scope
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--> $DIR/pin-needed-to-poll.rs:42:20
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LL | struct Sleep;
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| ------------- method `poll` not found for this
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...
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LL | self.sleep.poll(cx)
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| ^^^^ method not found in `Sleep`
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::: $SRC_DIR/core/src/future/future.rs:LL:COL
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LL | fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>;
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| ---- the method is available for `Pin<&mut Sleep>` here
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|
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= help: items from traits can only be used if the trait is implemented and in scope
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= note: the following trait defines an item `poll`, perhaps you need to implement it:
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candidate #1: `Future`
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help: consider wrapping the receiver expression with the appropriate type
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LL | Pin::new(&mut self.sleep).poll(cx)
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| ^^^^^^^^^^^^^ ^
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error: aborting due to previous error
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For more information about this error, try `rustc --explain E0599`.
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@ -6,14 +6,6 @@ LL | struct Foo {
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...
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LL | let _y = x.clone();
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| ^^^^^ method not found in `Foo`
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::: $SRC_DIR/core/src/clone.rs:LL:COL
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LL | fn clone(&self) -> Self;
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| -----
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| |
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| the method is available for `Arc<Foo>` here
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| the method is available for `Rc<Foo>` here
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|
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= help: items from traits can only be used if the trait is implemented and in scope
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= note: the following trait defines an item `clone`, perhaps you need to implement it:
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@ -12,14 +12,6 @@ LL | struct NotClone;
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...
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LL | Bar::<NotClone> { x: 1 }.clone();
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| ^^^^^ method cannot be called on `Bar<NotClone>` due to unsatisfied trait bounds
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::: $SRC_DIR/core/src/clone.rs:LL:COL
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LL | fn clone(&self) -> Self;
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| -----
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| |
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| the method is available for `Arc<Bar<NotClone>>` here
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| the method is available for `Rc<Bar<NotClone>>` here
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= note: the following trait bounds were not satisfied:
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`NotClone: Clone`
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@ -6,14 +6,6 @@ LL | struct C {
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...
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LL | let _d = c.clone();
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| ^^^^^ method not found in `C`
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::: $SRC_DIR/core/src/clone.rs:LL:COL
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LL | fn clone(&self) -> Self;
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| -----
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| |
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| the method is available for `Arc<C>` here
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| the method is available for `Rc<C>` here
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= help: items from traits can only be used if the trait is implemented and in scope
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= note: the following trait defines an item `clone`, perhaps you need to implement it:
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@ -8,14 +8,6 @@ LL | let _ = Struct::<A>::new().clone();
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LL | pub struct Struct<A>(A);
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| ------------------------ doesn't satisfy `Struct<A>: Clone`
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::: $SRC_DIR/core/src/clone.rs:LL:COL
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LL | fn clone(&self) -> Self;
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| -----
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| |
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| the method is available for `Arc<Struct<A>>` here
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| the method is available for `Rc<Struct<A>>` here
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= note: the following trait bounds were not satisfied:
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`A: Clone`
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@ -3,14 +3,6 @@ error[E0599]: no method named `clone` found for enum `c_void` in the current sco
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LL | let _z = (*y).clone();
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| ^^^^^ method not found in `c_void`
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::: $SRC_DIR/core/src/clone.rs:LL:COL
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LL | fn clone(&self) -> Self;
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| -----
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| |
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| the method is available for `Arc<c_void>` here
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| the method is available for `Rc<c_void>` here
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error: aborting due to previous error
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@ -6,14 +6,6 @@ LL | struct Foo {
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...
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LL | let _y = x.clone();
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| ^^^^^ method not found in `Foo`
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::: $SRC_DIR/core/src/clone.rs:LL:COL
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LL | fn clone(&self) -> Self;
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| -----
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| |
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| the method is available for `Arc<Foo>` here
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| the method is available for `Rc<Foo>` here
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= help: items from traits can only be used if the trait is implemented and in scope
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= note: the following trait defines an item `clone`, perhaps you need to implement it:
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@ -9,6 +9,11 @@ LL | fn foo(self: Box<Self>) {}
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...
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LL | A.foo();
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| ^^^ method not found in `A`
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help: consider wrapping the receiver expression with the appropriate type
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LL | Box::new(A).foo();
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| ^^^^^^^^^ ^
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error: aborting due to previous error
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@ -10,6 +10,11 @@ LL | struct A;
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...
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LL | A.foo()
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| ^^^ method not found in `A`
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help: consider wrapping the receiver expression with the appropriate type
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LL | Box::new(A).foo()
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| ^^^^^^^^^ ^
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error: aborting due to previous error
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@ -1,11 +0,0 @@
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error[E0261]: use of undeclared lifetime name `'a`
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--> $DIR/missing-lifetimes-in-signature.rs:36:11
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LL | fn baz<G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
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| - ^^ undeclared lifetime
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| |
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| help: consider introducing lifetime `'a` here: `'a,`
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error: aborting due to previous error
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For more information about this error, try `rustc --explain E0261`.
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@ -6,14 +6,6 @@ LL | struct Qux;
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...
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LL | Qux.clone();
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| ^^^^^ method not found in `Qux`
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::: $SRC_DIR/core/src/clone.rs:LL:COL
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LL | fn clone(&self) -> Self;
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| -----
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| |
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| the method is available for `Arc<Qux>` here
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| the method is available for `Rc<Qux>` here
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|
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= help: items from traits can only be used if the trait is implemented and in scope
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= note: the trait `Clone` defines an item `clone`, but is explicitely unimplemented
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@ -25,14 +25,6 @@ LL | struct CloneNoCopy;
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...
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LL | let w = u.clone();
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| ^^^^^ method cannot be called on `U5<CloneNoCopy>` due to unsatisfied trait bounds
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::: $SRC_DIR/core/src/clone.rs:LL:COL
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LL | fn clone(&self) -> Self;
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| -----
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| |
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| the method is available for `Arc<U5<CloneNoCopy>>` here
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| the method is available for `Rc<U5<CloneNoCopy>>` here
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|
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= note: the following trait bounds were not satisfied:
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`CloneNoCopy: Copy`
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@ -10,14 +10,6 @@ LL | trait Foo {
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LL | let _z = y.clone();
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| ^^^^^ method cannot be called on `Box<dyn Foo>` due to unsatisfied trait bounds
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|
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::: $SRC_DIR/core/src/clone.rs:LL:COL
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LL | fn clone(&self) -> Self;
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| -----
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| |
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| the method is available for `Arc<Box<dyn Foo>>` here
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| the method is available for `Rc<Box<dyn Foo>>` here
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::: $SRC_DIR/alloc/src/boxed.rs:LL:COL
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LL | / pub struct Box<
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@ -7,14 +7,6 @@ LL | struct R {
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LL | let _j = i.clone();
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| ^^^^^ method cannot be called on `Box<R>` due to unsatisfied trait bounds
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|
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::: $SRC_DIR/core/src/clone.rs:LL:COL
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|
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LL | fn clone(&self) -> Self;
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| -----
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| |
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| the method is available for `Arc<Box<R>>` here
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| the method is available for `Rc<Box<R>>` here
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|
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::: $SRC_DIR/alloc/src/boxed.rs:LL:COL
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|
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LL | / pub struct Box<
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