From 3ba3b740299dcd9c26ec86901fb1d4ecf7f42e59 Mon Sep 17 00:00:00 2001 From: Michael Goulet Date: Sat, 23 Nov 2024 18:32:10 +0000 Subject: [PATCH] Dont create trait object if it has errors in it --- .../src/hir_ty_lowering/dyn_compatibility.rs | 7 +- tests/crashes/130521.rs | 2 +- tests/rustdoc-ui/unable-fulfill-trait.rs | 1 - tests/rustdoc-ui/unable-fulfill-trait.stderr | 11 +- .../const-generics/not_wf_param_in_rpitit.rs | 3 - .../not_wf_param_in_rpitit.stderr | 76 +---------- tests/ui/issues/issue-23024.rs | 1 - tests/ui/issues/issue-23024.stderr | 10 +- tests/ui/issues/issue-34373.rs | 1 - tests/ui/issues/issue-34373.stderr | 30 +--- ...use-type-argument-instead-of-assoc-type.rs | 3 +- ...type-argument-instead-of-assoc-type.stderr | 17 +-- ...ce-hir-wf-check-anon-const-issue-122199.rs | 8 -- ...ir-wf-check-anon-const-issue-122199.stderr | 129 +++--------------- 14 files changed, 39 insertions(+), 260 deletions(-) diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/dyn_compatibility.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/dyn_compatibility.rs index 0ca30dc601ddd..f6e227377b9b8 100644 --- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/dyn_compatibility.rs +++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/dyn_compatibility.rs @@ -8,7 +8,8 @@ use rustc_lint_defs::builtin::UNUSED_ASSOCIATED_TYPE_BOUNDS; use rustc_middle::span_bug; use rustc_middle::ty::fold::BottomUpFolder; use rustc_middle::ty::{ - self, DynKind, ExistentialPredicateStableCmpExt as _, Ty, TyCtxt, TypeFoldable, Upcast, + self, DynKind, ExistentialPredicateStableCmpExt as _, Ty, TyCtxt, TypeFoldable, + TypeVisitableExt, Upcast, }; use rustc_span::{ErrorGuaranteed, Span}; use rustc_trait_selection::error_reporting::traits::report_dyn_incompatibility; @@ -103,6 +104,10 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ { let guar = self.report_trait_object_with_no_traits_error(span, &trait_bounds); return Ty::new_error(tcx, guar); } + // Don't create a dyn trait if we have errors in the principal. + if let Err(guar) = trait_bounds.error_reported() { + return Ty::new_error(tcx, guar); + } // Check that there are no gross dyn-compatibility violations; // most importantly, that the supertraits don't contain `Self`, diff --git a/tests/crashes/130521.rs b/tests/crashes/130521.rs index ccc2b444b822a..ebcfacf96238c 100644 --- a/tests/crashes/130521.rs +++ b/tests/crashes/130521.rs @@ -1,7 +1,7 @@ //@ known-bug: #130521 #![feature(dyn_compatible_for_dispatch)] -struct Vtable(dyn Cap); +struct Vtable(dyn Cap<'static>); trait Cap<'a> {} diff --git a/tests/rustdoc-ui/unable-fulfill-trait.rs b/tests/rustdoc-ui/unable-fulfill-trait.rs index 4edc7ab76c198..49dce32072b61 100644 --- a/tests/rustdoc-ui/unable-fulfill-trait.rs +++ b/tests/rustdoc-ui/unable-fulfill-trait.rs @@ -3,7 +3,6 @@ pub struct Foo<'a, 'b, T> { field1: dyn Bar<'a, 'b>, //~^ ERROR - //~| ERROR } pub trait Bar<'x, 's, U> diff --git a/tests/rustdoc-ui/unable-fulfill-trait.stderr b/tests/rustdoc-ui/unable-fulfill-trait.stderr index 12e53546cdacc..5af1ac6f1f5ea 100644 --- a/tests/rustdoc-ui/unable-fulfill-trait.stderr +++ b/tests/rustdoc-ui/unable-fulfill-trait.stderr @@ -14,13 +14,6 @@ help: add missing generic argument LL | field1: dyn Bar<'a, 'b, U>, | +++ -error[E0227]: ambiguous lifetime bound, explicit lifetime bound required - --> $DIR/unable-fulfill-trait.rs:4:13 - | -LL | field1: dyn Bar<'a, 'b>, - | ^^^^^^^^^^^^^^^ - -error: aborting due to 2 previous errors +error: aborting due to 1 previous error -Some errors have detailed explanations: E0107, E0227. -For more information about an error, try `rustc --explain E0107`. +For more information about this error, try `rustc --explain E0107`. diff --git a/tests/ui/const-generics/not_wf_param_in_rpitit.rs b/tests/ui/const-generics/not_wf_param_in_rpitit.rs index b454562ad497a..cb1e90923e75d 100644 --- a/tests/ui/const-generics/not_wf_param_in_rpitit.rs +++ b/tests/ui/const-generics/not_wf_param_in_rpitit.rs @@ -3,9 +3,6 @@ trait Trait { //~^ ERROR: cannot find value `bar` in this scope //~| ERROR: cycle detected when computing type of `Trait::N` - //~| ERROR: the trait `Trait` cannot be made into an object - //~| ERROR: the trait `Trait` cannot be made into an object - //~| ERROR: the trait `Trait` cannot be made into an object async fn a() {} } diff --git a/tests/ui/const-generics/not_wf_param_in_rpitit.stderr b/tests/ui/const-generics/not_wf_param_in_rpitit.stderr index 2500409e82858..42ae012fa5570 100644 --- a/tests/ui/const-generics/not_wf_param_in_rpitit.stderr +++ b/tests/ui/const-generics/not_wf_param_in_rpitit.stderr @@ -18,77 +18,7 @@ LL | trait Trait { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information -error[E0038]: the trait `Trait` cannot be made into an object - --> $DIR/not_wf_param_in_rpitit.rs:3:22 - | -LL | trait Trait { - | ^^^^^^^^^ `Trait` cannot be made into an object - | -note: for a trait to be "dyn-compatible" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit - --> $DIR/not_wf_param_in_rpitit.rs:9:14 - | -LL | trait Trait { - | ----- this trait cannot be made into an object... -... -LL | async fn a() {} - | ^ ...because associated function `a` has no `self` parameter -help: consider turning `a` into a method by giving it a `&self` argument - | -LL | async fn a(&self) {} - | +++++ -help: alternatively, consider constraining `a` so it does not apply to trait objects - | -LL | async fn a() where Self: Sized {} - | +++++++++++++++++ - -error[E0038]: the trait `Trait` cannot be made into an object - --> $DIR/not_wf_param_in_rpitit.rs:3:13 - | -LL | trait Trait { - | ^^^^^^^^^^^^^^^^^^^^^^^^ `Trait` cannot be made into an object - | -note: for a trait to be "dyn-compatible" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit - --> $DIR/not_wf_param_in_rpitit.rs:9:14 - | -LL | trait Trait { - | ----- this trait cannot be made into an object... -... -LL | async fn a() {} - | ^ ...because associated function `a` has no `self` parameter -help: consider turning `a` into a method by giving it a `&self` argument - | -LL | async fn a(&self) {} - | +++++ -help: alternatively, consider constraining `a` so it does not apply to trait objects - | -LL | async fn a() where Self: Sized {} - | +++++++++++++++++ - -error[E0038]: the trait `Trait` cannot be made into an object - --> $DIR/not_wf_param_in_rpitit.rs:3:13 - | -LL | trait Trait { - | ^^^^^^^^^^^^^^^^^^^^^^^^ `Trait` cannot be made into an object - | -note: for a trait to be "dyn-compatible" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit - --> $DIR/not_wf_param_in_rpitit.rs:9:14 - | -LL | trait Trait { - | ----- this trait cannot be made into an object... -... -LL | async fn a() {} - | ^ ...because associated function `a` has no `self` parameter - = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no` -help: consider turning `a` into a method by giving it a `&self` argument - | -LL | async fn a(&self) {} - | +++++ -help: alternatively, consider constraining `a` so it does not apply to trait objects - | -LL | async fn a() where Self: Sized {} - | +++++++++++++++++ - -error: aborting due to 5 previous errors +error: aborting due to 2 previous errors -Some errors have detailed explanations: E0038, E0391, E0425. -For more information about an error, try `rustc --explain E0038`. +Some errors have detailed explanations: E0391, E0425. +For more information about an error, try `rustc --explain E0391`. diff --git a/tests/ui/issues/issue-23024.rs b/tests/ui/issues/issue-23024.rs index 25220dc3e611c..1b072dd7b69c0 100644 --- a/tests/ui/issues/issue-23024.rs +++ b/tests/ui/issues/issue-23024.rs @@ -8,5 +8,4 @@ fn main() println!("{:?}",(vfnfer[0] as dyn Fn)(3)); //~^ ERROR the precise format of `Fn`-family traits' //~| ERROR missing generics for trait `Fn` - //~| ERROR the value of the associated type `Output` in `FnOnce` } diff --git a/tests/ui/issues/issue-23024.stderr b/tests/ui/issues/issue-23024.stderr index 62278a51be635..51db0414f3a39 100644 --- a/tests/ui/issues/issue-23024.stderr +++ b/tests/ui/issues/issue-23024.stderr @@ -19,13 +19,7 @@ help: add missing generic argument LL | println!("{:?}",(vfnfer[0] as dyn Fn)(3)); | ++++++ -error[E0191]: the value of the associated type `Output` in `FnOnce` must be specified - --> $DIR/issue-23024.rs:8:39 - | -LL | println!("{:?}",(vfnfer[0] as dyn Fn)(3)); - | ^^ help: specify the associated type: `Fn::` - -error: aborting due to 3 previous errors +error: aborting due to 2 previous errors -Some errors have detailed explanations: E0107, E0191, E0658. +Some errors have detailed explanations: E0107, E0658. For more information about an error, try `rustc --explain E0107`. diff --git a/tests/ui/issues/issue-34373.rs b/tests/ui/issues/issue-34373.rs index dc20c5589b33f..707aa8cf33833 100644 --- a/tests/ui/issues/issue-34373.rs +++ b/tests/ui/issues/issue-34373.rs @@ -6,7 +6,6 @@ trait Trait { pub struct Foo>>; //~ ERROR cycle detected //~^ ERROR `T` is never used -//~| ERROR `Trait` cannot be made into an object type DefaultFoo = Foo; fn main() { diff --git a/tests/ui/issues/issue-34373.stderr b/tests/ui/issues/issue-34373.stderr index 4e8e7c61fee89..0636555821730 100644 --- a/tests/ui/issues/issue-34373.stderr +++ b/tests/ui/issues/issue-34373.stderr @@ -5,7 +5,7 @@ LL | pub struct Foo>>; | ^^^^^^^^^^ | note: ...which requires expanding type alias `DefaultFoo`... - --> $DIR/issue-34373.rs:10:19 + --> $DIR/issue-34373.rs:9:19 | LL | type DefaultFoo = Foo; | ^^^ @@ -17,28 +17,6 @@ LL | pub struct Foo>>; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information -error[E0038]: the trait `Trait` cannot be made into an object - --> $DIR/issue-34373.rs:7:24 - | -LL | pub struct Foo>>; - | ^^^^^^^^^^^^^^^^^ `Trait` cannot be made into an object - | -note: for a trait to be "dyn-compatible" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit - --> $DIR/issue-34373.rs:4:8 - | -LL | trait Trait { - | ----- this trait cannot be made into an object... -LL | fn foo(_: T) {} - | ^^^ ...because associated function `foo` has no `self` parameter -help: consider turning `foo` into a method by giving it a `&self` argument - | -LL | fn foo(&self, _: T) {} - | ++++++ -help: alternatively, consider constraining `foo` so it does not apply to trait objects - | -LL | fn foo(_: T) where Self: Sized {} - | +++++++++++++++++ - error[E0392]: type parameter `T` is never used --> $DIR/issue-34373.rs:7:16 | @@ -48,7 +26,7 @@ LL | pub struct Foo>>; = help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData` = help: if you intended `T` to be a const parameter, use `const T: /* Type */` instead -error: aborting due to 3 previous errors +error: aborting due to 2 previous errors -Some errors have detailed explanations: E0038, E0391, E0392. -For more information about an error, try `rustc --explain E0038`. +Some errors have detailed explanations: E0391, E0392. +For more information about an error, try `rustc --explain E0391`. diff --git a/tests/ui/suggestions/use-type-argument-instead-of-assoc-type.rs b/tests/ui/suggestions/use-type-argument-instead-of-assoc-type.rs index ed262fd39a5a9..c2387bf5411d1 100644 --- a/tests/ui/suggestions/use-type-argument-instead-of-assoc-type.rs +++ b/tests/ui/suggestions/use-type-argument-instead-of-assoc-type.rs @@ -5,8 +5,7 @@ pub trait T { } pub struct Foo { i: Box>, - //~^ ERROR must be specified - //~| ERROR trait takes 2 generic arguments but 4 generic arguments were supplied + //~^ ERROR trait takes 2 generic arguments but 4 generic arguments were supplied } diff --git a/tests/ui/suggestions/use-type-argument-instead-of-assoc-type.stderr b/tests/ui/suggestions/use-type-argument-instead-of-assoc-type.stderr index 7c84dd4b8ff33..18cf0674f0231 100644 --- a/tests/ui/suggestions/use-type-argument-instead-of-assoc-type.stderr +++ b/tests/ui/suggestions/use-type-argument-instead-of-assoc-type.stderr @@ -14,19 +14,6 @@ help: replace the generic bounds with the associated types LL | i: Box>, | +++ +++ -error[E0191]: the value of the associated types `C` and `A` in `T` must be specified - --> $DIR/use-type-argument-instead-of-assoc-type.rs:7:16 - | -LL | type A; - | ------ `A` defined here -LL | type B; -LL | type C; - | ------ `C` defined here -... -LL | i: Box>, - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ associated types `A`, `C` must be specified - -error: aborting due to 2 previous errors +error: aborting due to 1 previous error -Some errors have detailed explanations: E0107, E0191. -For more information about an error, try `rustc --explain E0107`. +For more information about this error, try `rustc --explain E0107`. diff --git a/tests/ui/wf/ice-hir-wf-check-anon-const-issue-122199.rs b/tests/ui/wf/ice-hir-wf-check-anon-const-issue-122199.rs index 53363319ba0e6..a95e10b7265dd 100644 --- a/tests/ui/wf/ice-hir-wf-check-anon-const-issue-122199.rs +++ b/tests/ui/wf/ice-hir-wf-check-anon-const-issue-122199.rs @@ -1,11 +1,6 @@ trait Trait { //~^ ERROR cannot find value `bar` in this scope //~| ERROR cycle detected when computing type of `Trait::N` - //~| ERROR the trait `Trait` cannot be made into an object - //~| ERROR the trait `Trait` cannot be made into an object - //~| ERROR the trait `Trait` cannot be made into an object - //~| WARN trait objects without an explicit `dyn` are deprecated [bare_trait_objects] - //~| WARN this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! //~| WARN trait objects without an explicit `dyn` are deprecated [bare_trait_objects] //~| WARN this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! fn fnc(&self) -> Trait { @@ -13,9 +8,6 @@ trait Trait { //~| ERROR expected value, found builtin type `u32` //~| ERROR defaults for const parameters are only allowed in `struct`, `enum`, `type`, or `trait` definitions //~| ERROR associated item referring to unboxed trait object for its own trait - //~| ERROR the trait `Trait` cannot be made into an object - //~| WARN trait objects without an explicit `dyn` are deprecated [bare_trait_objects] - //~| WARN this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! //~| WARN trait objects without an explicit `dyn` are deprecated [bare_trait_objects] //~| WARN this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! //~| WARN trait objects without an explicit `dyn` are deprecated [bare_trait_objects] diff --git a/tests/ui/wf/ice-hir-wf-check-anon-const-issue-122199.stderr b/tests/ui/wf/ice-hir-wf-check-anon-const-issue-122199.stderr index fefb788fac79c..339f7b2cc8207 100644 --- a/tests/ui/wf/ice-hir-wf-check-anon-const-issue-122199.stderr +++ b/tests/ui/wf/ice-hir-wf-check-anon-const-issue-122199.stderr @@ -1,5 +1,5 @@ error[E0403]: the name `N` is already used for a generic parameter in this item's generic parameters - --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:11:18 + --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:6:18 | LL | trait Trait { | - first use of `N` @@ -14,13 +14,13 @@ LL | trait Trait { | ^^^ not found in this scope error[E0423]: expected value, found builtin type `u32` - --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:11:29 + --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:6:29 | LL | fn fnc(&self) -> Trait { | ^^^ not a value error[E0425]: cannot find value `bar` in this scope - --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:23:9 + --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:15:9 | LL | bar | ^^^ not found in this scope @@ -53,27 +53,8 @@ LL | trait Trait { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information -error: defaults for const parameters are only allowed in `struct`, `enum`, `type`, or `trait` definitions - --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:11:12 - | -LL | fn fnc(&self) -> Trait { - | ^^^^^^^^^^^^^^^^^^^^ - warning: trait objects without an explicit `dyn` are deprecated - --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:11:21 - | -LL | fn fnc(&self) -> Trait { - | ^^^^^ - | - = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! - = note: for more information, see -help: if this is a dyn-compatible trait, use `dyn` - | -LL | fn fnc(&self) -> Trait { - | +++ - -warning: trait objects without an explicit `dyn` are deprecated - --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:11:44 + --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:6:44 | LL | fn fnc(&self) -> Trait { | ^^^^^ @@ -85,114 +66,40 @@ help: if this is a dyn-compatible trait, use `dyn` LL | fn fnc(&self) -> dyn Trait { | +++ -warning: trait objects without an explicit `dyn` are deprecated - --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:1:22 - | -LL | trait Trait { - | ^^^^^ - | - = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! - = note: for more information, see - = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no` -help: if this is a dyn-compatible trait, use `dyn` - | -LL | trait Trait { - | +++ - -error[E0038]: the trait `Trait` cannot be made into an object - --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:1:22 - | -LL | trait Trait { - | ^^^^^ `Trait` cannot be made into an object - | -note: for a trait to be "dyn-compatible" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit - --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:11:8 - | -LL | trait Trait { - | ----- this trait cannot be made into an object... -... -LL | fn fnc(&self) -> Trait { - | ^^^ ...because method `fnc` has generic type parameters - = help: consider moving `fnc` to another trait - -error[E0038]: the trait `Trait` cannot be made into an object - --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:1:13 - | -LL | trait Trait { - | ^^^^^^^^^^^^^^^^^^^^ `Trait` cannot be made into an object - | -note: for a trait to be "dyn-compatible" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit - --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:11:8 - | -LL | trait Trait { - | ----- this trait cannot be made into an object... -... -LL | fn fnc(&self) -> Trait { - | ^^^ ...because method `fnc` has generic type parameters - = help: consider moving `fnc` to another trait - -error: associated item referring to unboxed trait object for its own trait - --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:11:44 +error: defaults for const parameters are only allowed in `struct`, `enum`, `type`, or `trait` definitions + --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:6:12 | -LL | trait Trait { - | ----- in this trait -... LL | fn fnc(&self) -> Trait { - | ^^^^^ - | -help: you might have meant to use `Self` to refer to the implementing type - | -LL | fn fnc(&self) -> Self { - | ~~~~ + | ^^^^^^^^^^^^^^^^^^^^ warning: trait objects without an explicit `dyn` are deprecated - --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:11:21 + --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:6:21 | LL | fn fnc(&self) -> Trait { | ^^^^^ | = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! = note: for more information, see - = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no` help: if this is a dyn-compatible trait, use `dyn` | LL | fn fnc(&self) -> Trait { | +++ -error[E0038]: the trait `Trait` cannot be made into an object - --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:11:21 - | -LL | fn fnc(&self) -> Trait { - | ^^^^^ `Trait` cannot be made into an object - | -note: for a trait to be "dyn-compatible" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit - --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:11:8 +error: associated item referring to unboxed trait object for its own trait + --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:6:44 | LL | trait Trait { - | ----- this trait cannot be made into an object... + | ----- in this trait ... LL | fn fnc(&self) -> Trait { - | ^^^ ...because method `fnc` has generic type parameters - = help: consider moving `fnc` to another trait - -error[E0038]: the trait `Trait` cannot be made into an object - --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:1:13 - | -LL | trait Trait { - | ^^^^^^^^^^^^^^^^^^^^ `Trait` cannot be made into an object + | ^^^^^ | -note: for a trait to be "dyn-compatible" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit - --> $DIR/ice-hir-wf-check-anon-const-issue-122199.rs:11:8 +help: you might have meant to use `Self` to refer to the implementing type | -LL | trait Trait { - | ----- this trait cannot be made into an object... -... -LL | fn fnc(&self) -> Trait { - | ^^^ ...because method `fnc` has generic type parameters - = help: consider moving `fnc` to another trait - = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no` +LL | fn fnc(&self) -> Self { + | ~~~~ -error: aborting due to 11 previous errors; 5 warnings emitted +error: aborting due to 7 previous errors; 3 warnings emitted -Some errors have detailed explanations: E0038, E0391, E0403, E0423, E0425. -For more information about an error, try `rustc --explain E0038`. +Some errors have detailed explanations: E0391, E0403, E0423, E0425. +For more information about an error, try `rustc --explain E0391`.