add links to query documentation for E0391

50 files changed, 60 insertions, 56 deletions

diff --git a/compiler/rustc_error_codes/src/error_codes/E0391.md b/compiler/rustc_error_codes/src/error_codes/E0391.md
index dff50ccaa0b..457fbd002a1 100644
--- a/compiler/rustc_error_codes/src/error_codes/E0391.md
+++ b/compiler/rustc_error_codes/src/error_codes/E0391.md
@@ -14,3 +14,6 @@ trait SecondTrait : FirstTrait {
 
 The previous example contains a circular dependency between two traits:
 `FirstTrait` depends on `SecondTrait` which itself depends on `FirstTrait`.
+
+See https://rustc-dev-guide.rust-lang.org/overview.html#queries and
+https://rustc-dev-guide.rust-lang.org/query.html for more information.
diff --git a/compiler/rustc_query_system/messages.ftl b/compiler/rustc_query_system/messages.ftl
index 49b423d1ade..4e7ddeeebcd 100644
--- a/compiler/rustc_query_system/messages.ftl
+++ b/compiler/rustc_query_system/messages.ftl
@@ -1,4 +1,4 @@
-query_system_cycle = cycle detected when {$stack_bottom}
+query_system_cycle = cycle detected when {$stack_bottom}. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
 
 query_system_cycle_recursive_trait_alias = trait aliases cannot be recursive
 
diff --git a/tests/rustdoc-ui/issue-110629-private-type-cycle-dyn.stderr b/tests/rustdoc-ui/issue-110629-private-type-cycle-dyn.stderr
index 79e1b753112..0db322fbb75 100644
--- a/tests/rustdoc-ui/issue-110629-private-type-cycle-dyn.stderr
+++ b/tests/rustdoc-ui/issue-110629-private-type-cycle-dyn.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when expanding type alias `Bar`
+error[E0391]: cycle detected when expanding type alias `Bar`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/issue-110629-private-type-cycle-dyn.rs:1:38
    |
 LL | type Bar<'a, 'b> = Box<dyn PartialEq<Bar<'a, 'b>>>;
diff --git a/tests/ui/associated-consts/defaults-cyclic-fail.stderr b/tests/ui/associated-consts/defaults-cyclic-fail.stderr
index a1483911b29..bb4788b2ba1 100644
--- a/tests/ui/associated-consts/defaults-cyclic-fail.stderr
+++ b/tests/ui/associated-consts/defaults-cyclic-fail.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when const-evaluating + checking `Tr::A`
+error[E0391]: cycle detected when const-evaluating + checking `Tr::A`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/defaults-cyclic-fail.rs:5:19
    |
 LL |     const A: u8 = Self::B;
diff --git a/tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-impl.stderr b/tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-impl.stderr
index be578176151..eaf06ff1449 100644
--- a/tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-impl.stderr
+++ b/tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-impl.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when elaborating drops for `<impl at $DIR/issue-24949-assoc-const-static-recursion-impl.rs:11:1: 11:19>::BAR`
+error[E0391]: cycle detected when elaborating drops for `<impl at $DIR/issue-24949-assoc-const-static-recursion-impl.rs:11:1: 11:19>::BAR`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/issue-24949-assoc-const-static-recursion-impl.rs:12:22
    |
 LL |     const BAR: u32 = IMPL_REF_BAR;
diff --git a/tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-trait-default.stderr b/tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-trait-default.stderr
index 8347b260b56..2f36e4ee515 100644
--- a/tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-trait-default.stderr
+++ b/tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-trait-default.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when elaborating drops for `FooDefault::BAR`
+error[E0391]: cycle detected when elaborating drops for `FooDefault::BAR`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/issue-24949-assoc-const-static-recursion-trait-default.rs:8:22
    |
 LL |     const BAR: u32 = DEFAULT_REF_BAR;
diff --git a/tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-trait.stderr b/tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-trait.stderr
index 3955a3120c4..24fad93bc54 100644
--- a/tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-trait.stderr
+++ b/tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-trait.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when elaborating drops for `<impl at $DIR/issue-24949-assoc-const-static-recursion-trait.rs:11:1: 11:28>::BAR`
+error[E0391]: cycle detected when elaborating drops for `<impl at $DIR/issue-24949-assoc-const-static-recursion-trait.rs:11:1: 11:28>::BAR`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/issue-24949-assoc-const-static-recursion-trait.rs:12:22
    |
 LL |     const BAR: u32 = TRAIT_REF_BAR;
diff --git a/tests/ui/associated-inherent-types/bugs/cycle-iat-inside-of-adt.stderr b/tests/ui/associated-inherent-types/bugs/cycle-iat-inside-of-adt.stderr
index 23269e1afab..7cf243e546c 100644
--- a/tests/ui/associated-inherent-types/bugs/cycle-iat-inside-of-adt.stderr
+++ b/tests/ui/associated-inherent-types/bugs/cycle-iat-inside-of-adt.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing predicates of `Foo`
+error[E0391]: cycle detected when computing predicates of `Foo`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/cycle-iat-inside-of-adt.rs:7:1
    |
 LL | struct Foo {
diff --git a/tests/ui/associated-inherent-types/bugs/cycle-iat-inside-of-where-predicate.stderr b/tests/ui/associated-inherent-types/bugs/cycle-iat-inside-of-where-predicate.stderr
index aaa9a39ea0f..e5725e5ef1b 100644
--- a/tests/ui/associated-inherent-types/bugs/cycle-iat-inside-of-where-predicate.stderr
+++ b/tests/ui/associated-inherent-types/bugs/cycle-iat-inside-of-where-predicate.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing predicates of `user`
+error[E0391]: cycle detected when computing predicates of `user`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/cycle-iat-inside-of-where-predicate.rs:8:1
    |
 LL | fn user<T>() where S<T>::P: std::fmt::Debug {}
diff --git a/tests/ui/associated-type-bounds/ambiguous-associated-type2.rs b/tests/ui/associated-type-bounds/ambiguous-associated-type2.rs
index 48de593342f..7b2e1365a8f 100644
--- a/tests/ui/associated-type-bounds/ambiguous-associated-type2.rs
+++ b/tests/ui/associated-type-bounds/ambiguous-associated-type2.rs
@@ -5,6 +5,7 @@ trait Bar<T> {
     type Item;
 }
 trait Baz: Foo + Bar<Self::Item> {}
-//~^ ERROR cycle detected when computing the super traits of `Baz` with associated type name `Item` [E0391]
+//~^ ERROR cycle detected when computing the super traits of `Baz` with associated type name `Item`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information. [E0391]
+
 
 fn main() {}
diff --git a/tests/ui/associated-type-bounds/ambiguous-associated-type2.stderr b/tests/ui/associated-type-bounds/ambiguous-associated-type2.stderr
index 575b00e09b0..f51d9b381e6 100644
--- a/tests/ui/associated-type-bounds/ambiguous-associated-type2.stderr
+++ b/tests/ui/associated-type-bounds/ambiguous-associated-type2.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing the super traits of `Baz` with associated type name `Item`
+error[E0391]: cycle detected when computing the super traits of `Baz` with associated type name `Item`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/ambiguous-associated-type2.rs:7:1
    |
 LL | trait Baz: Foo + Bar<Self::Item> {}
diff --git a/tests/ui/associated-types/issue-20825.stderr b/tests/ui/associated-types/issue-20825.stderr
index c4dea68b884..fda07c78892 100644
--- a/tests/ui/associated-types/issue-20825.stderr
+++ b/tests/ui/associated-types/issue-20825.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing the super traits of `Processor` with associated type name `Input`
+error[E0391]: cycle detected when computing the super traits of `Processor` with associated type name `Input`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/issue-20825.rs:5:1
    |
 LL | pub trait Processor: Subscriber<Input = Self::Input> {
diff --git a/tests/ui/coherence/coherence-inherited-assoc-ty-cycle-err.stderr b/tests/ui/coherence/coherence-inherited-assoc-ty-cycle-err.stderr
index 7bd50649d6d..662d023b6aa 100644
--- a/tests/ui/coherence/coherence-inherited-assoc-ty-cycle-err.stderr
+++ b/tests/ui/coherence/coherence-inherited-assoc-ty-cycle-err.stderr
@@ -8,7 +8,7 @@ LL | #![feature(specialization)]
    = help: consider using `min_specialization` instead, which is more stable and complete
    = note: `#[warn(incomplete_features)]` on by default
 
-error[E0391]: cycle detected when building specialization graph of trait `Trait`
+error[E0391]: cycle detected when building specialization graph of trait `Trait`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/coherence-inherited-assoc-ty-cycle-err.rs:9:1
    |
 LL | trait Trait<T> { type Assoc; }
diff --git a/tests/ui/const-generics/generic_const_exprs/closures.stderr b/tests/ui/const-generics/generic_const_exprs/closures.stderr
index a7d891d7790..bac2ef58e91 100644
--- a/tests/ui/const-generics/generic_const_exprs/closures.stderr
+++ b/tests/ui/const-generics/generic_const_exprs/closures.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when building an abstract representation for `test::{constant#0}`
+error[E0391]: cycle detected when building an abstract representation for `test::{constant#0}`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/closures.rs:3:35
    |
 LL | fn test<const N: usize>() -> [u8; N + (|| 42)()] {}
diff --git a/tests/ui/const-generics/issues/issue-83765.stderr b/tests/ui/const-generics/issues/issue-83765.stderr
index d7b2b006c2a..c28a55ec9ae 100644
--- a/tests/ui/const-generics/issues/issue-83765.stderr
+++ b/tests/ui/const-generics/issues/issue-83765.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when resolving instance `<LazyUpdim<'_, T, <T as TensorDimension>::DIM, DIM> as TensorDimension>::DIM`
+error[E0391]: cycle detected when resolving instance `<LazyUpdim<'_, T, <T as TensorDimension>::DIM, DIM> as TensorDimension>::DIM`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/issue-83765.rs:5:5
    |
 LL |     const DIM: usize;
diff --git a/tests/ui/consts/const-size_of-cycle.stderr b/tests/ui/consts/const-size_of-cycle.stderr
index 17088d9995f..28448223a2a 100644
--- a/tests/ui/consts/const-size_of-cycle.stderr
+++ b/tests/ui/consts/const-size_of-cycle.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when evaluating type-level constant
+error[E0391]: cycle detected when evaluating type-level constant. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/const-size_of-cycle.rs:4:17
    |
 LL |     bytes: [u8; std::mem::size_of::<Foo>()]
diff --git a/tests/ui/consts/issue-103790.stderr b/tests/ui/consts/issue-103790.stderr
index 34d8ee281cf..7eae2555ca1 100644
--- a/tests/ui/consts/issue-103790.stderr
+++ b/tests/ui/consts/issue-103790.stderr
@@ -22,7 +22,7 @@ help: add missing generic argument
 LL | struct S<const S: (), const S: S<S> = { S }>;
    |                                 +++
 
-error[E0391]: cycle detected when computing type of `S::S`
+error[E0391]: cycle detected when computing type of `S::S`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/issue-103790.rs:4:32
    |
 LL | struct S<const S: (), const S: S = { S }>;
@@ -35,7 +35,7 @@ note: cycle used when computing type of `S`
 LL | struct S<const S: (), const S: S = { S }>;
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error[E0391]: cycle detected when computing type of `S`
+error[E0391]: cycle detected when computing type of `S`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/issue-103790.rs:4:1
    |
 LL | struct S<const S: (), const S: S = { S }>;
diff --git a/tests/ui/consts/issue-36163.stderr b/tests/ui/consts/issue-36163.stderr
index 7137c053847..2188dc0e356 100644
--- a/tests/ui/consts/issue-36163.stderr
+++ b/tests/ui/consts/issue-36163.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when const-evaluating + checking `Foo::B::{constant#0}`
+error[E0391]: cycle detected when const-evaluating + checking `Foo::B::{constant#0}`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/issue-36163.rs:4:9
    |
 LL |     B = A,
diff --git a/tests/ui/consts/issue-44415.stderr b/tests/ui/consts/issue-44415.stderr
index ec64b956dfe..02be3e644f8 100644
--- a/tests/ui/consts/issue-44415.stderr
+++ b/tests/ui/consts/issue-44415.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when evaluating type-level constant
+error[E0391]: cycle detected when evaluating type-level constant. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/issue-44415.rs:6:17
    |
 LL |     bytes: [u8; unsafe { intrinsics::size_of::<Foo>() }],
diff --git a/tests/ui/consts/recursive-zst-static.default.stderr b/tests/ui/consts/recursive-zst-static.default.stderr
index d68960b0972..e4838e92710 100644
--- a/tests/ui/consts/recursive-zst-static.default.stderr
+++ b/tests/ui/consts/recursive-zst-static.default.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when const-evaluating + checking `FOO`
+error[E0391]: cycle detected when const-evaluating + checking `FOO`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/recursive-zst-static.rs:10:1
    |
 LL | static FOO: () = FOO;
diff --git a/tests/ui/consts/recursive-zst-static.unleash.stderr b/tests/ui/consts/recursive-zst-static.unleash.stderr
index d68960b0972..e4838e92710 100644
--- a/tests/ui/consts/recursive-zst-static.unleash.stderr
+++ b/tests/ui/consts/recursive-zst-static.unleash.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when const-evaluating + checking `FOO`
+error[E0391]: cycle detected when const-evaluating + checking `FOO`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/recursive-zst-static.rs:10:1
    |
 LL | static FOO: () = FOO;
diff --git a/tests/ui/consts/write-to-static-mut-in-static.stderr b/tests/ui/consts/write-to-static-mut-in-static.stderr
index 395b2d42f97..8816f952d16 100644
--- a/tests/ui/consts/write-to-static-mut-in-static.stderr
+++ b/tests/ui/consts/write-to-static-mut-in-static.stderr
@@ -4,7 +4,7 @@ error[E0080]: could not evaluate static initializer
 LL | pub static mut B: () = unsafe { A = 1; };
    |                                 ^^^^^ modifying a static's initial value from another static's initializer
 
-error[E0391]: cycle detected when const-evaluating + checking `C`
+error[E0391]: cycle detected when const-evaluating + checking `C`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/write-to-static-mut-in-static.rs:5:1
    |
 LL | pub static mut C: u32 = unsafe { C = 1; 0 };
diff --git a/tests/ui/cycle-trait/cycle-trait-default-type-trait.stderr b/tests/ui/cycle-trait/cycle-trait-default-type-trait.stderr
index 9d715f49471..cfc434e3a36 100644
--- a/tests/ui/cycle-trait/cycle-trait-default-type-trait.stderr
+++ b/tests/ui/cycle-trait/cycle-trait-default-type-trait.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing type of `Foo::X`
+error[E0391]: cycle detected when computing type of `Foo::X`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/cycle-trait-default-type-trait.rs:4:23
    |
 LL | trait Foo<X = Box<dyn Foo>> {
diff --git a/tests/ui/cycle-trait/cycle-trait-supertrait-direct.stderr b/tests/ui/cycle-trait/cycle-trait-supertrait-direct.stderr
index e2b2aac05ac..4bb9edf3cb5 100644
--- a/tests/ui/cycle-trait/cycle-trait-supertrait-direct.stderr
+++ b/tests/ui/cycle-trait/cycle-trait-supertrait-direct.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing the super predicates of `Chromosome`
+error[E0391]: cycle detected when computing the super predicates of `Chromosome`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/cycle-trait-supertrait-direct.rs:3:19
    |
 LL | trait Chromosome: Chromosome {
diff --git a/tests/ui/cycle-trait/cycle-trait-supertrait-indirect.stderr b/tests/ui/cycle-trait/cycle-trait-supertrait-indirect.stderr
index c903e114657..61af1f29db7 100644
--- a/tests/ui/cycle-trait/cycle-trait-supertrait-indirect.stderr
+++ b/tests/ui/cycle-trait/cycle-trait-supertrait-indirect.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing the super predicates of `B`
+error[E0391]: cycle detected when computing the super predicates of `B`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/cycle-trait-supertrait-indirect.rs:7:10
    |
 LL | trait B: C {
diff --git a/tests/ui/cycle-trait/issue-12511.stderr b/tests/ui/cycle-trait/issue-12511.stderr
index 558aad10946..7c61156065f 100644
--- a/tests/ui/cycle-trait/issue-12511.stderr
+++ b/tests/ui/cycle-trait/issue-12511.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing the super predicates of `T1`
+error[E0391]: cycle detected when computing the super predicates of `T1`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/issue-12511.rs:1:12
    |
 LL | trait T1 : T2 {
diff --git a/tests/ui/dyn-star/param-env-region-infer.next.stderr b/tests/ui/dyn-star/param-env-region-infer.next.stderr
index dd724a65908..1222645567c 100644
--- a/tests/ui/dyn-star/param-env-region-infer.next.stderr
+++ b/tests/ui/dyn-star/param-env-region-infer.next.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing type of `make_dyn_star::{opaque#0}`
+error[E0391]: cycle detected when computing type of `make_dyn_star::{opaque#0}`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/param-env-region-infer.rs:16:60
    |
 LL | fn make_dyn_star<'a, T: PointerLike + Debug + 'a>(t: T) -> impl PointerLike + Debug + 'a {
diff --git a/tests/ui/impl-trait/auto-trait-leak.stderr b/tests/ui/impl-trait/auto-trait-leak.stderr
index 92a9763bc9b..53b229c2402 100644
--- a/tests/ui/impl-trait/auto-trait-leak.stderr
+++ b/tests/ui/impl-trait/auto-trait-leak.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing type of `cycle1::{opaque#0}`
+error[E0391]: cycle detected when computing type of `cycle1::{opaque#0}`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/auto-trait-leak.rs:11:16
    |
 LL | fn cycle1() -> impl Clone {
@@ -34,7 +34,7 @@ LL | |     Rc::new(String::from("foo"))
 LL | | }
    | |_^
 
-error[E0391]: cycle detected when computing type of `cycle1::{opaque#0}`
+error[E0391]: cycle detected when computing type of `cycle1::{opaque#0}`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/auto-trait-leak.rs:11:16
    |
 LL | fn cycle1() -> impl Clone {
diff --git a/tests/ui/infinite/infinite-trait-alias-recursion.stderr b/tests/ui/infinite/infinite-trait-alias-recursion.stderr
index 683987b4943..56331e17f62 100644
--- a/tests/ui/infinite/infinite-trait-alias-recursion.stderr
+++ b/tests/ui/infinite/infinite-trait-alias-recursion.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing the super predicates of `T1`
+error[E0391]: cycle detected when computing the super predicates of `T1`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/infinite-trait-alias-recursion.rs:3:12
    |
 LL | trait T1 = T2;
diff --git a/tests/ui/infinite/infinite-type-alias-mutual-recursion.stderr b/tests/ui/infinite/infinite-type-alias-mutual-recursion.stderr
index 7f82b294434..547cbc10aea 100644
--- a/tests/ui/infinite/infinite-type-alias-mutual-recursion.stderr
+++ b/tests/ui/infinite/infinite-type-alias-mutual-recursion.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when expanding type alias `X1`
+error[E0391]: cycle detected when expanding type alias `X1`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/infinite-type-alias-mutual-recursion.rs:1:11
    |
 LL | type X1 = X2;
diff --git a/tests/ui/infinite/infinite-vec-type-recursion.stderr b/tests/ui/infinite/infinite-vec-type-recursion.stderr
index 1e487a5b11c..a7411cf73d9 100644
--- a/tests/ui/infinite/infinite-vec-type-recursion.stderr
+++ b/tests/ui/infinite/infinite-vec-type-recursion.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when expanding type alias `X`
+error[E0391]: cycle detected when expanding type alias `X`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/infinite-vec-type-recursion.rs:1:14
    |
 LL | type X = Vec<X>;
diff --git a/tests/ui/issues/issue-17252.stderr b/tests/ui/issues/issue-17252.stderr
index aca5242b296..bd357003cc7 100644
--- a/tests/ui/issues/issue-17252.stderr
+++ b/tests/ui/issues/issue-17252.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when const-evaluating + checking `FOO`
+error[E0391]: cycle detected when const-evaluating + checking `FOO`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/issue-17252.rs:1:20
    |
 LL | const FOO: usize = FOO;
diff --git a/tests/ui/issues/issue-20772.stderr b/tests/ui/issues/issue-20772.stderr
index 416fd8c062f..ab692e64cda 100644
--- a/tests/ui/issues/issue-20772.stderr
+++ b/tests/ui/issues/issue-20772.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing the super traits of `T` with associated type name `Item`
+error[E0391]: cycle detected when computing the super traits of `T` with associated type name `Item`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/issue-20772.rs:1:1
    |
 LL | trait T : Iterator<Item=Self::Item>
diff --git a/tests/ui/issues/issue-21177.stderr b/tests/ui/issues/issue-21177.stderr
index 6877a184605..69b26cbb105 100644
--- a/tests/ui/issues/issue-21177.stderr
+++ b/tests/ui/issues/issue-21177.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing the bounds for type parameter `T`
+error[E0391]: cycle detected when computing the bounds for type parameter `T`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/issue-21177.rs:6:21
    |
 LL | fn foo<T: Trait<A = T::B>>() { }
diff --git a/tests/ui/issues/issue-23302-1.stderr b/tests/ui/issues/issue-23302-1.stderr
index 9366050d7ec..f238b1c8a21 100644
--- a/tests/ui/issues/issue-23302-1.stderr
+++ b/tests/ui/issues/issue-23302-1.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when const-evaluating + checking `X::A::{constant#0}`
+error[E0391]: cycle detected when const-evaluating + checking `X::A::{constant#0}`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/issue-23302-1.rs:4:9
    |
 LL |     A = X::A as isize,
diff --git a/tests/ui/issues/issue-23302-2.stderr b/tests/ui/issues/issue-23302-2.stderr
index b97ae287a47..454b4ad9aa9 100644
--- a/tests/ui/issues/issue-23302-2.stderr
+++ b/tests/ui/issues/issue-23302-2.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when const-evaluating + checking `Y::A::{constant#0}`
+error[E0391]: cycle detected when const-evaluating + checking `Y::A::{constant#0}`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/issue-23302-2.rs:4:9
    |
 LL |     A = Y::B as isize,
diff --git a/tests/ui/issues/issue-23302-3.stderr b/tests/ui/issues/issue-23302-3.stderr
index c6cafe575e5..318eb42ef3e 100644
--- a/tests/ui/issues/issue-23302-3.stderr
+++ b/tests/ui/issues/issue-23302-3.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when const-evaluating + checking `A`
+error[E0391]: cycle detected when const-evaluating + checking `A`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/issue-23302-3.rs:1:16
    |
 LL | const A: i32 = B;
diff --git a/tests/ui/issues/issue-34373.stderr b/tests/ui/issues/issue-34373.stderr
index 8be3cfa72fb..b7c358a5f6a 100644
--- a/tests/ui/issues/issue-34373.stderr
+++ b/tests/ui/issues/issue-34373.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing type of `Foo::T`
+error[E0391]: cycle detected when computing type of `Foo::T`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/issue-34373.rs:7:30
    |
 LL | pub struct Foo<T = Box<Trait<DefaultFoo>>>;
diff --git a/tests/ui/recursion/issue-26548-recursion-via-normalize.stderr b/tests/ui/recursion/issue-26548-recursion-via-normalize.stderr
index a75097cdbfb..48d146d9cdb 100644
--- a/tests/ui/recursion/issue-26548-recursion-via-normalize.stderr
+++ b/tests/ui/recursion/issue-26548-recursion-via-normalize.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing layout of `core::option::Option<S>`
+error[E0391]: cycle detected when computing layout of `core::option::Option<S>`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
    |
    = note: ...which requires computing layout of `S`...
    = note: ...which requires computing layout of `core::option::Option<<S as Mirror>::It>`...
diff --git a/tests/ui/recursion/recursive-static-definition.stderr b/tests/ui/recursion/recursive-static-definition.stderr
index 1359761457a..e5b9e64bcb1 100644
--- a/tests/ui/recursion/recursive-static-definition.stderr
+++ b/tests/ui/recursion/recursive-static-definition.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when const-evaluating + checking `FOO`
+error[E0391]: cycle detected when const-evaluating + checking `FOO`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/recursive-static-definition.rs:1:1
    |
 LL | pub static FOO: u32 = FOO;
diff --git a/tests/ui/resolve/resolve-self-in-impl.stderr b/tests/ui/resolve/resolve-self-in-impl.stderr
index 9f9ed68898f..e9b6793713f 100644
--- a/tests/ui/resolve/resolve-self-in-impl.stderr
+++ b/tests/ui/resolve/resolve-self-in-impl.stderr
@@ -38,7 +38,7 @@ LL | impl (Self, Self) {}
    |
    = note: replace `Self` with a different type
 
-error[E0391]: cycle detected when computing trait implemented by `<impl at $DIR/resolve-self-in-impl.rs:19:1: 19:23>`
+error[E0391]: cycle detected when computing trait implemented by `<impl at $DIR/resolve-self-in-impl.rs:19:1: 19:23>`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/resolve-self-in-impl.rs:19:1
    |
 LL | impl Tr<Self::A> for S {}
diff --git a/tests/ui/sized/recursive-type-2.stderr b/tests/ui/sized/recursive-type-2.stderr
index d0e6e9db07e..fc68cac9599 100644
--- a/tests/ui/sized/recursive-type-2.stderr
+++ b/tests/ui/sized/recursive-type-2.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing layout of `Foo<()>`
+error[E0391]: cycle detected when computing layout of `Foo<()>`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
    |
    = note: ...which requires computing layout of `<() as A>::Assoc`...
    = note: ...which again requires computing layout of `Foo<()>`, completing the cycle
diff --git a/tests/ui/traits/trait-upcasting/cyclic-trait-resolution.rs b/tests/ui/traits/trait-upcasting/cyclic-trait-resolution.rs
index 511e41562b2..8efe17d5d0e 100644
--- a/tests/ui/traits/trait-upcasting/cyclic-trait-resolution.rs
+++ b/tests/ui/traits/trait-upcasting/cyclic-trait-resolution.rs
@@ -1,5 +1,5 @@
 trait A: B + A {}
-//~^ ERROR cycle detected when computing the super predicates of `A` [E0391]
+//~^ ERROR cycle detected when computing the super predicates of `A`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information. [E0391]
 
 trait B {}
 
diff --git a/tests/ui/traits/trait-upcasting/cyclic-trait-resolution.stderr b/tests/ui/traits/trait-upcasting/cyclic-trait-resolution.stderr
index ca98e183150..e20776dafbe 100644
--- a/tests/ui/traits/trait-upcasting/cyclic-trait-resolution.stderr
+++ b/tests/ui/traits/trait-upcasting/cyclic-trait-resolution.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing the super predicates of `A`
+error[E0391]: cycle detected when computing the super predicates of `A`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/cyclic-trait-resolution.rs:1:14
    |
 LL | trait A: B + A {}
diff --git a/tests/ui/type-alias-enum-variants/self-in-enum-definition.stderr b/tests/ui/type-alias-enum-variants/self-in-enum-definition.stderr
index c943a4918ba..b7b6bab8916 100644
--- a/tests/ui/type-alias-enum-variants/self-in-enum-definition.stderr
+++ b/tests/ui/type-alias-enum-variants/self-in-enum-definition.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when simplifying constant for the type system `Alpha::V3::{constant#0}`
+error[E0391]: cycle detected when simplifying constant for the type system `Alpha::V3::{constant#0}`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/self-in-enum-definition.rs:5:10
    |
 LL |     V3 = Self::V1 {} as u8 + 2,
diff --git a/tests/ui/type-alias-impl-trait/auto-trait-leakage3.rs b/tests/ui/type-alias-impl-trait/auto-trait-leakage3.rs
index fd3f9c61420..a1c91329246 100644
--- a/tests/ui/type-alias-impl-trait/auto-trait-leakage3.rs
+++ b/tests/ui/type-alias-impl-trait/auto-trait-leakage3.rs
@@ -5,8 +5,8 @@
 
 mod m {
     pub type Foo = impl std::fmt::Debug;
-    //~^ ERROR: cycle detected when computing type of `m::Foo::{opaque#0}` [E0391]
-    //~| ERROR: cycle detected when computing type of `m::Foo::{opaque#0}` [E0391]
+    //~^ ERROR: cycle detected when computing type of `m::Foo::{opaque#0}`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information. [E0391]
+    //~| ERROR: cycle detected when computing type of `m::Foo::{opaque#0}`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information. [E0391]
 
     pub fn foo() -> Foo {
         22_u32
diff --git a/tests/ui/type-alias-impl-trait/auto-trait-leakage3.stderr b/tests/ui/type-alias-impl-trait/auto-trait-leakage3.stderr
index dd56c59bf5f..6ed5d835095 100644
--- a/tests/ui/type-alias-impl-trait/auto-trait-leakage3.stderr
+++ b/tests/ui/type-alias-impl-trait/auto-trait-leakage3.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing type of `m::Foo::{opaque#0}`
+error[E0391]: cycle detected when computing type of `m::Foo::{opaque#0}`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/auto-trait-leakage3.rs:7:20
    |
 LL |     pub type Foo = impl std::fmt::Debug;
@@ -17,7 +17,7 @@ note: cycle used when checking item types in module `m`
 LL | mod m {
    | ^^^^^
 
-error[E0391]: cycle detected when computing type of `m::Foo::{opaque#0}`
+error[E0391]: cycle detected when computing type of `m::Foo::{opaque#0}`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/auto-trait-leakage3.rs:7:20
    |
 LL |     pub type Foo = impl std::fmt::Debug;
diff --git a/tests/ui/type-alias-impl-trait/inference-cycle.stderr b/tests/ui/type-alias-impl-trait/inference-cycle.stderr
index 4d5f367476b..07b656a0722 100644
--- a/tests/ui/type-alias-impl-trait/inference-cycle.stderr
+++ b/tests/ui/type-alias-impl-trait/inference-cycle.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing type of `m::Foo::{opaque#0}`
+error[E0391]: cycle detected when computing type of `m::Foo::{opaque#0}`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/inference-cycle.rs:5:20
    |
 LL |     pub type Foo = impl std::fmt::Debug;
@@ -17,7 +17,7 @@ note: cycle used when checking item types in module `m`
 LL | mod m {
    | ^^^^^
 
-error[E0391]: cycle detected when computing type of `m::Foo::{opaque#0}`
+error[E0391]: cycle detected when computing type of `m::Foo::{opaque#0}`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/inference-cycle.rs:5:20
    |
 LL |     pub type Foo = impl std::fmt::Debug;
diff --git a/tests/ui/type-alias-impl-trait/issue-53092-2.stderr b/tests/ui/type-alias-impl-trait/issue-53092-2.stderr
index 2565a28b493..909ceedcc65 100644
--- a/tests/ui/type-alias-impl-trait/issue-53092-2.stderr
+++ b/tests/ui/type-alias-impl-trait/issue-53092-2.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing type of `Bug::{opaque#0}`
+error[E0391]: cycle detected when computing type of `Bug::{opaque#0}`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/issue-53092-2.rs:4:18
    |
 LL | type Bug<T, U> = impl Fn(T) -> U + Copy;
diff --git a/tests/ui/type-alias-impl-trait/reveal_local.stderr b/tests/ui/type-alias-impl-trait/reveal_local.stderr
index 0c5ef4a6fb4..e4a919db956 100644
--- a/tests/ui/type-alias-impl-trait/reveal_local.stderr
+++ b/tests/ui/type-alias-impl-trait/reveal_local.stderr
@@ -1,4 +1,4 @@
-error[E0391]: cycle detected when computing type of `Foo::{opaque#0}`
+error[E0391]: cycle detected when computing type of `Foo::{opaque#0}`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/reveal_local.rs:5:12
    |
 LL | type Foo = impl Debug;
@@ -23,7 +23,7 @@ LL | |
 LL | | fn main() {}
    | |____________^
 
-error[E0391]: cycle detected when computing type of `Foo::{opaque#0}`
+error[E0391]: cycle detected when computing type of `Foo::{opaque#0}`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/reveal_local.rs:5:12
    |
 LL | type Foo = impl Debug;
@@ -69,7 +69,7 @@ note: required by a bound in `is_send`
 LL | fn is_send<T: Send>() {}
    |               ^^^^ required by this bound in `is_send`
 
-error[E0391]: cycle detected when computing type of `Foo::{opaque#0}`
+error[E0391]: cycle detected when computing type of `Foo::{opaque#0}`. see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information.
   --> $DIR/reveal_local.rs:5:12
    |
 LL | type Foo = impl Debug;