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WF-check struct field types at construction site

Browse Source 
Rustc of course already WF-checked the field types at the definition
site, but for error tainting of consts to work properly, there needs to
be an error emitted at the use site. Previously, with no use-site error,
we proceeded with CTFE and ran into ICEs since we are running code with
type errors.

Emitting use-site errors also brings struct-like constructors more in
line with fn-like constructors since they already emit use-site errors
for WF issues.
This commit is contained in:
Noah Lev 2024-08-05 17:26:46 -07:00
parent 18906754cc
commit 9479792cb4
17 changed files with 387 additions and 57 deletions
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9
compiler/rustc_hir_typeck/src/expr.rs
View File

@ -1736,6 +1736,15 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
Ty::new_error(tcx, guar)
};
// Check that the expected field type is WF. Otherwise, we emit no use-site error
// in the case of coercions for non-WF fields, which leads to incorrect error
// tainting. See issue #126272.
self.register_wf_obligation(
field_type.into(),
field.expr.span,
ObligationCauseCode::WellFormed(None),
);
// Make sure to give a type to the field even if there's
// an error, so we can continue type-checking.
let ty = self.check_expr_with_hint(field.expr, field_type);

28
tests/crashes/126272.rs
View File

@ -1,28 +0,0 @@
//@ known-bug: rust-lang/rust#126272
#![feature(adt_const_params)]
#![allow(incomplete_features)]
use std::marker::ConstParamTy;
#[derive(Debug, PartialEq, Eq, ConstParamTy)]
struct Foo {
value: i32,
nested: &'static Bar<std::fmt::Debug>,
}
#[derive(Debug, PartialEq, Eq, ConstParamTy)]
struct Bar<T>(T);
struct Test<const F: Foo>;
fn main() {
let x: Test<
{
Foo {
value: 3,
nested: &Bar(4),
}
},
> = Test;
}

12
tests/crashes/127299.rs
View File

@ -1,12 +0,0 @@
//@ known-bug: rust-lang/rust#127299
trait Qux {
fn bar() -> i32;
}
pub struct Lint {
pub desc: &'static Qux,
}
static FOO: &Lint = &Lint { desc: "desc" };
fn main() {}

28
tests/ui/const-generics/adt_const_params/unsizing-wfcheck-issue-126272.rs Normal file
View File

@ -0,0 +1,28 @@
// This ensures we don't ICE in situations like rust-lang/rust#126272.
#![feature(adt_const_params)]
#![allow(incomplete_features)]
use std::marker::ConstParamTy;
#[derive(Debug, PartialEq, Eq, ConstParamTy)]
//~^ ERROR the trait `ConstParamTy_`
//~| ERROR the trait `ConstParamTy_`
struct Foo {
nested: &'static Bar<dyn std::fmt::Debug>,
//~^ ERROR the size for values
//~| ERROR the size for values
//~| ERROR binary operation `==` cannot
//~| ERROR the trait bound `dyn Debug: Eq`
//~| ERROR the size for values
}
#[derive(Debug, PartialEq, Eq, ConstParamTy)]
struct Bar<T>(T);
struct Test<const F: Foo>;
fn main() {
let x: Test<{ Foo { nested: &Bar(4) } }> = Test;
//~^ ERROR the size for values
}

160
tests/ui/const-generics/adt_const_params/unsizing-wfcheck-issue-126272.stderr Normal file
View File

@ -0,0 +1,160 @@
error[E0277]: the size for values of type `(dyn Debug + 'static)` cannot be known at compilation time
--> $DIR/unsizing-wfcheck-issue-126272.rs:12:13
|
LL | nested: &'static Bar<dyn std::fmt::Debug>,
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
|
= help: the trait `Sized` is not implemented for `(dyn Debug + 'static)`
note: required by an implicit `Sized` bound in `Bar`
--> $DIR/unsizing-wfcheck-issue-126272.rs:21:12
|
LL | struct Bar<T>(T);
| ^ required by the implicit `Sized` requirement on this type parameter in `Bar`
help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
--> $DIR/unsizing-wfcheck-issue-126272.rs:21:12
|
LL | struct Bar<T>(T);
| ^ - ...if indirection were used here: `Box<T>`
| |
| this could be changed to `T: ?Sized`...
error[E0204]: the trait `ConstParamTy_` cannot be implemented for this type
--> $DIR/unsizing-wfcheck-issue-126272.rs:8:32
|
LL | #[derive(Debug, PartialEq, Eq, ConstParamTy)]
| ^^^^^^^^^^^^
...
LL | nested: &'static Bar<dyn std::fmt::Debug>,
| ----------------------------------------- this field does not implement `ConstParamTy_`
|
= note: this error originates in the derive macro `ConstParamTy` (in Nightly builds, run with -Z macro-backtrace for more info)
error[E0204]: the trait `ConstParamTy_` cannot be implemented for this type
--> $DIR/unsizing-wfcheck-issue-126272.rs:8:32
|
LL | #[derive(Debug, PartialEq, Eq, ConstParamTy)]
| ^^^^^^^^^^^^
...
LL | nested: &'static Bar<dyn std::fmt::Debug>,
| ----------------------------------------- this field does not implement `ConstParamTy_`
|
note: the `ConstParamTy_` impl for `&'static Bar<(dyn Debug + 'static)>` requires that `(dyn Debug + 'static): Eq`
--> $DIR/unsizing-wfcheck-issue-126272.rs:12:13
|
LL | nested: &'static Bar<dyn std::fmt::Debug>,
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: the `ConstParamTy_` impl for `&'static Bar<(dyn Debug + 'static)>` requires that `(dyn Debug + 'static): Sized`
--> $DIR/unsizing-wfcheck-issue-126272.rs:12:13
|
LL | nested: &'static Bar<dyn std::fmt::Debug>,
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: the `ConstParamTy_` impl for `&'static Bar<(dyn Debug + 'static)>` requires that `(dyn Debug + 'static): UnsizedConstParamTy`
--> $DIR/unsizing-wfcheck-issue-126272.rs:12:13
|
LL | nested: &'static Bar<dyn std::fmt::Debug>,
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: this error originates in the derive macro `ConstParamTy` (in Nightly builds, run with -Z macro-backtrace for more info)
error[E0277]: the size for values of type `(dyn Debug + 'static)` cannot be known at compilation time
--> $DIR/unsizing-wfcheck-issue-126272.rs:12:5
|
LL | #[derive(Debug, PartialEq, Eq, ConstParamTy)]
| ----- in this derive macro expansion
...
LL | nested: &'static Bar<dyn std::fmt::Debug>,
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
|
= help: the trait `Sized` is not implemented for `(dyn Debug + 'static)`, which is required by `&&'static Bar<(dyn Debug + 'static)>: Debug`
= help: the trait `Debug` is implemented for `Bar<T>`
note: required for `Bar<(dyn Debug + 'static)>` to implement `Debug`
--> $DIR/unsizing-wfcheck-issue-126272.rs:20:10
|
LL | #[derive(Debug, PartialEq, Eq, ConstParamTy)]
| ^^^^^
LL | struct Bar<T>(T);
| - unsatisfied trait bound introduced in this `derive` macro
= note: 2 redundant requirements hidden
= note: required for `&&'static Bar<(dyn Debug + 'static)>` to implement `Debug`
= note: required for the cast from `&&&'static Bar<(dyn Debug + 'static)>` to `&dyn Debug`
= note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
error[E0369]: binary operation `==` cannot be applied to type `&Bar<dyn Debug>`
--> $DIR/unsizing-wfcheck-issue-126272.rs:12:5
|
LL | #[derive(Debug, PartialEq, Eq, ConstParamTy)]
| --------- in this derive macro expansion
...
LL | nested: &'static Bar<dyn std::fmt::Debug>,
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: this error originates in the derive macro `PartialEq` (in Nightly builds, run with -Z macro-backtrace for more info)
error[E0277]: the trait bound `dyn Debug: Eq` is not satisfied
--> $DIR/unsizing-wfcheck-issue-126272.rs:12:5
|
LL | #[derive(Debug, PartialEq, Eq, ConstParamTy)]
| -- in this derive macro expansion
...
LL | nested: &'static Bar<dyn std::fmt::Debug>,
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Eq` is not implemented for `dyn Debug`, which is required by `&'static Bar<dyn Debug>: Eq`
|
= help: the trait `Eq` is implemented for `Bar<T>`
note: required for `Bar<dyn Debug>` to implement `Eq`
--> $DIR/unsizing-wfcheck-issue-126272.rs:20:28
|
LL | #[derive(Debug, PartialEq, Eq, ConstParamTy)]
| ^^ unsatisfied trait bound introduced in this `derive` macro
= note: 1 redundant requirement hidden
= note: required for `&'static Bar<dyn Debug>` to implement `Eq`
note: required by a bound in `AssertParamIsEq`
--> $SRC_DIR/core/src/cmp.rs:LL:COL
= note: this error originates in the derive macro `Eq` (in Nightly builds, run with -Z macro-backtrace for more info)
error[E0277]: the size for values of type `dyn Debug` cannot be known at compilation time
--> $DIR/unsizing-wfcheck-issue-126272.rs:12:5
|
LL | #[derive(Debug, PartialEq, Eq, ConstParamTy)]
| -- in this derive macro expansion
...
LL | nested: &'static Bar<dyn std::fmt::Debug>,
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
|
= help: the trait `Sized` is not implemented for `dyn Debug`
note: required by an implicit `Sized` bound in `Bar`
--> $DIR/unsizing-wfcheck-issue-126272.rs:21:12
|
LL | struct Bar<T>(T);
| ^ required by the implicit `Sized` requirement on this type parameter in `Bar`
help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
--> $DIR/unsizing-wfcheck-issue-126272.rs:21:12
|
LL | struct Bar<T>(T);
| ^ - ...if indirection were used here: `Box<T>`
| |
| this could be changed to `T: ?Sized`...
= note: this error originates in the derive macro `Eq` (in Nightly builds, run with -Z macro-backtrace for more info)
error[E0277]: the size for values of type `(dyn Debug + 'static)` cannot be known at compilation time
--> $DIR/unsizing-wfcheck-issue-126272.rs:26:33
|
LL | let x: Test<{ Foo { nested: &Bar(4) } }> = Test;
| ^^^^^^^ doesn't have a size known at compile-time
|
= help: the trait `Sized` is not implemented for `(dyn Debug + 'static)`
note: required by an implicit `Sized` bound in `Bar`
--> $DIR/unsizing-wfcheck-issue-126272.rs:21:12
|
LL | struct Bar<T>(T);
| ^ required by the implicit `Sized` requirement on this type parameter in `Bar`
help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
--> $DIR/unsizing-wfcheck-issue-126272.rs:21:12
|
LL | struct Bar<T>(T);
| ^ - ...if indirection were used here: `Box<T>`
| |
| this could be changed to `T: ?Sized`...
error: aborting due to 8 previous errors
Some errors have detailed explanations: E0204, E0277, E0369.
For more information about an error, try `rustc --explain E0204`.

1
tests/ui/const-generics/generic_const_exprs/no_where_clause.rs
View File

@ -17,6 +17,7 @@ impl<const N: usize> Example<N> {
a: [0.; N],
b: [0.; complex_maths(N)],
//~^ ERROR: unconstrained generic constant
//~| ERROR: unconstrained generic constant
}
}
}

13
tests/ui/const-generics/generic_const_exprs/no_where_clause.stderr
View File

@ -9,6 +9,17 @@ help: try adding a `where` bound
LL | pub struct Example<const N: usize> where [(); complex_maths(N)]: {
| +++++++++++++++++++++++++++++
error: unconstrained generic constant
--> $DIR/no_where_clause.rs:18:10
|
LL | b: [0.; complex_maths(N)],
| ^^^^^^^^^^^^^^^^^^^^^^
|
help: try adding a `where` bound
|
LL | pub fn new() -> Self where [(); complex_maths(N)]: {
| +++++++++++++++++++++++++++++
error: unconstrained generic constant
--> $DIR/no_where_clause.rs:18:15
|
@ -20,5 +31,5 @@ help: try adding a `where` bound
LL | pub fn new() -> Self where [(); complex_maths(N)]: {
| +++++++++++++++++++++++++++++
error: aborting due to 2 previous errors
error: aborting due to 3 previous errors

2
tests/ui/generic-associated-types/issue-71176.rs
View File

@ -16,6 +16,6 @@ struct Holder<B> {
fn main() {
Holder {
inner: Box::new(()),
inner: Box::new(()), //~ ERROR: the trait `Provider` cannot be made into an object
};
}

18
tests/ui/generic-associated-types/issue-71176.stderr
View File

@ -64,7 +64,23 @@ LL | type A<'a>;
= help: consider moving `A` to another trait
= help: only type `()` implements the trait, consider using it directly instead
error: aborting due to 4 previous errors
error[E0038]: the trait `Provider` cannot be made into an object
--> $DIR/issue-71176.rs:19:16
|
LL | inner: Box::new(()),
| ^^^^^^^^^^^^ `Provider` cannot be made into an object
|
note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
--> $DIR/issue-71176.rs:2:10
|
LL | trait Provider {
| -------- this trait cannot be made into an object...
LL | type A<'a>;
| ^ ...because it contains the generic associated type `A`
= help: consider moving `A` to another trait
= help: only type `()` implements the trait, consider using it directly instead
error: aborting due to 5 previous errors
Some errors have detailed explanations: E0038, E0107.
For more information about an error, try `rustc --explain E0038`.

1
tests/ui/issues/issue-19380.rs
View File

@ -15,5 +15,6 @@ struct Bar {
const FOO : Foo = Foo;
const BAR : Bar = Bar { foos: &[&FOO]};
//~^ ERROR E0038
//~| ERROR E0038
fn main() { }

25
tests/ui/issues/issue-19380.stderr
View File

@ -45,6 +45,29 @@ help: alternatively, consider constraining `qiz` so it does not apply to trait o
LL | fn qiz() where Self: Sized;
| +++++++++++++++++
error: aborting due to 2 previous errors
error[E0038]: the trait `Qiz` cannot be made into an object
--> $DIR/issue-19380.rs:16:31
|
LL | const BAR : Bar = Bar { foos: &[&FOO]};
| ^^^^^^^ `Qiz` cannot be made into an object
|
note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
--> $DIR/issue-19380.rs:2:6
|
LL | trait Qiz {
| --- this trait cannot be made into an object...
LL | fn qiz();
| ^^^ ...because associated function `qiz` has no `self` parameter
= help: only type `Foo` implements the trait, consider using it directly instead
help: consider turning `qiz` into a method by giving it a `&self` argument
|
LL | fn qiz(&self);
| +++++
help: alternatively, consider constraining `qiz` so it does not apply to trait objects
|
LL | fn qiz() where Self: Sized;
| +++++++++++++++++
error: aborting due to 3 previous errors
For more information about this error, try `rustc --explain E0038`.

17
tests/ui/statics/unsizing-wfcheck-issue-127299.rs Normal file
View File

@ -0,0 +1,17 @@
// This ensures we don't ICE in situations like rust-lang/rust#127299.
trait Qux {
fn bar() -> i32;
}
pub struct Lint {
pub desc: &'static dyn Qux,
//~^ ERROR cannot be made into an object
}
static FOO: &Lint = &Lint { desc: "desc" };
//~^ ERROR cannot be shared between threads safely
//~| ERROR cannot be made into an object
//~| ERROR cannot be made into an object
fn main() {}

87
tests/ui/statics/unsizing-wfcheck-issue-127299.stderr Normal file
View File

@ -0,0 +1,87 @@
error[E0038]: the trait `Qux` cannot be made into an object
--> $DIR/unsizing-wfcheck-issue-127299.rs:8:24
|
LL | pub desc: &'static dyn Qux,
| ^^^^^^^ `Qux` cannot be made into an object
|
note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
--> $DIR/unsizing-wfcheck-issue-127299.rs:4:8
|
LL | trait Qux {
| --- this trait cannot be made into an object...
LL | fn bar() -> i32;
| ^^^ ...because associated function `bar` has no `self` parameter
help: consider turning `bar` into a method by giving it a `&self` argument
|
LL | fn bar(&self) -> i32;
| +++++
help: alternatively, consider constraining `bar` so it does not apply to trait objects
|
LL | fn bar() -> i32 where Self: Sized;
| +++++++++++++++++
error[E0277]: `(dyn Qux + 'static)` cannot be shared between threads safely
--> $DIR/unsizing-wfcheck-issue-127299.rs:12:13
|
LL | static FOO: &Lint = &Lint { desc: "desc" };
| ^^^^^ `(dyn Qux + 'static)` cannot be shared between threads safely
|
= help: within `&'static Lint`, the trait `Sync` is not implemented for `(dyn Qux + 'static)`, which is required by `&'static Lint: Sync`
= note: required because it appears within the type `&'static (dyn Qux + 'static)`
note: required because it appears within the type `Lint`
--> $DIR/unsizing-wfcheck-issue-127299.rs:7:12
|
LL | pub struct Lint {
| ^^^^
= note: required because it appears within the type `&'static Lint`
= note: shared static variables must have a type that implements `Sync`
error[E0038]: the trait `Qux` cannot be made into an object
--> $DIR/unsizing-wfcheck-issue-127299.rs:12:35
|
LL | static FOO: &Lint = &Lint { desc: "desc" };
| ^^^^^^ `Qux` cannot be made into an object
|
note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
--> $DIR/unsizing-wfcheck-issue-127299.rs:4:8
|
LL | trait Qux {
| --- this trait cannot be made into an object...
LL | fn bar() -> i32;
| ^^^ ...because associated function `bar` has no `self` parameter
= note: required for the cast from `&'static str` to `&'static (dyn Qux + 'static)`
help: consider turning `bar` into a method by giving it a `&self` argument
|
LL | fn bar(&self) -> i32;
| +++++
help: alternatively, consider constraining `bar` so it does not apply to trait objects
|
LL | fn bar() -> i32 where Self: Sized;
| +++++++++++++++++
error[E0038]: the trait `Qux` cannot be made into an object
--> $DIR/unsizing-wfcheck-issue-127299.rs:12:35
|
LL | static FOO: &Lint = &Lint { desc: "desc" };
| ^^^^^^ `Qux` cannot be made into an object
|
note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
--> $DIR/unsizing-wfcheck-issue-127299.rs:4:8
|
LL | trait Qux {
| --- this trait cannot be made into an object...
LL | fn bar() -> i32;
| ^^^ ...because associated function `bar` has no `self` parameter
help: consider turning `bar` into a method by giving it a `&self` argument
|
LL | fn bar(&self) -> i32;
| +++++
help: alternatively, consider constraining `bar` so it does not apply to trait objects
|
LL | fn bar() -> i32 where Self: Sized;
| +++++++++++++++++
error: aborting due to 4 previous errors
Some errors have detailed explanations: E0038, E0277.
For more information about an error, try `rustc --explain E0038`.

1
tests/ui/structs/field-implied-unsizing-wfcheck.rs
View File

@ -7,4 +7,5 @@ struct Bar<T>(T);
fn main() {
let x = Foo { nested: &Bar(4) };
//~^ ERROR the size for values of type `(dyn Debug + 'static)` cannot be known at compilation time
}

22
tests/ui/structs/field-implied-unsizing-wfcheck.stderr
View File

@ -18,6 +18,26 @@ LL | struct Bar<T>(T);
| |
| this could be changed to `T: ?Sized`...
error: aborting due to 1 previous error
error[E0277]: the size for values of type `(dyn Debug + 'static)` cannot be known at compilation time
--> $DIR/field-implied-unsizing-wfcheck.rs:9:27
|
LL | let x = Foo { nested: &Bar(4) };
| ^^^^^^^ doesn't have a size known at compile-time
|
= help: the trait `Sized` is not implemented for `(dyn Debug + 'static)`
note: required by an implicit `Sized` bound in `Bar`
--> $DIR/field-implied-unsizing-wfcheck.rs:6:12
|
LL | struct Bar<T>(T);
| ^ required by the implicit `Sized` requirement on this type parameter in `Bar`
help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
--> $DIR/field-implied-unsizing-wfcheck.rs:6:12
|
LL | struct Bar<T>(T);
| ^ - ...if indirection were used here: `Box<T>`
| |
| this could be changed to `T: ?Sized`...
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0277`.

10
tests/ui/suggestions/missing-bound-in-derive-copy-impl-2.stderr
View File

@ -44,15 +44,13 @@ LL | #[derive(Debug, Copy, Clone)]
| ----- in this derive macro expansion
LL | pub struct AABB<K: Debug> {
LL | pub loc: Vector2<K>,
| ^^^^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `K`, which is required by `Vector2<K>: Clone`
| ^^^^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `K`
|
note: required for `Vector2<K>` to implement `Clone`
--> $DIR/missing-bound-in-derive-copy-impl-2.rs:4:23
note: required by a bound in `Vector2`
--> $DIR/missing-bound-in-derive-copy-impl-2.rs:5:31
|
LL | #[derive(Debug, Copy, Clone)]
| ^^^^^
LL | pub struct Vector2<T: Debug + Copy + Clone> {
| ---- unsatisfied trait bound introduced in this `derive` macro
| ^^^^ required by this bound in `Vector2`
= note: this error originates in the derive macro `Clone` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider further restricting this bound
|

10
tests/ui/suggestions/missing-bound-in-derive-copy-impl.stderr
View File

@ -95,15 +95,13 @@ LL | #[derive(Debug, Copy, Clone)]
| ----- in this derive macro expansion
LL | pub struct AABB<K> {
LL | pub loc: Vector2<K>,
| ^^^^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `K`, which is required by `Vector2<K>: Clone`
| ^^^^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `K`
|
note: required for `Vector2<K>` to implement `Clone`
--> $DIR/missing-bound-in-derive-copy-impl.rs:3:23
note: required by a bound in `Vector2`
--> $DIR/missing-bound-in-derive-copy-impl.rs:4:31
|
LL | #[derive(Debug, Copy, Clone)]
| ^^^^^
LL | pub struct Vector2<T: Debug + Copy + Clone> {
| ---- unsatisfied trait bound introduced in this `derive` macro
| ^^^^ required by this bound in `Vector2`
= note: this error originates in the derive macro `Clone` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider restricting type parameter `K`
|