Rollup merge of #66979 - reese:E0631-long-error, r=GuillaumeGomez

Add long error for E0631 and update ui tests.

This PR adds a long error for `E0631`, which covers errors where closure argument types are mismatched. It also updates UI tests where this error is applicable.

Part of #61137

src/test/ui/anonymous-higher-ranked-lifetime.stderr

@@ -121,3 +121,4 @@ LL | fn h2<F>(_: F) where F: for<'t0> Fn(&(), Box<dyn Fn(&())>, &'t0 (), fn(&(),
 
 error: aborting due to 11 previous errors
 
+For more information about this error, try `rustc --explain E0631`.

src/test/ui/closure-expected-type/expect-fn-supply-fn.nll.stderr

@@ -39,3 +39,4 @@ LL |     with_closure_expecting_fn_with_bound_region(|x: Foo<'_>, y| {
 
 error: aborting due to 3 previous errors
 
+For more information about this error, try `rustc --explain E0631`.

src/test/ui/closure-expected-type/expect-fn-supply-fn.stderr

@@ -77,4 +77,5 @@ LL |     with_closure_expecting_fn_with_bound_region(|x: Foo<'_>, y| {
 
 error: aborting due to 5 previous errors
 
-For more information about this error, try `rustc --explain E0308`.
+Some errors have detailed explanations: E0308, E0631.
+For more information about an error, try `rustc --explain E0308`.

src/test/ui/closure-expected-type/expect-infer-var-appearing-twice.stderr

@@ -13,3 +13,4 @@ LL |     with_closure(|x: u32, y: i32| {
 
 error: aborting due to previous error
 
+For more information about this error, try `rustc --explain E0631`.

src/test/ui/closures/issue-41366.stderr

@@ -19,4 +19,5 @@ LL |     (&|_|()) as &dyn for<'x> Fn(<u32 as T<'x>>::V);
 
 error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0271`.
+Some errors have detailed explanations: E0271, E0631.
+For more information about an error, try `rustc --explain E0271`.

src/test/ui/issues/issue-43623.stderr

@@ -25,4 +25,5 @@ LL |     break_me::<Type, fn(_)>;
 
 error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0271`.
+Some errors have detailed explanations: E0271, E0631.
+For more information about an error, try `rustc --explain E0271`.

src/test/ui/issues/issue-60283.stderr

@@ -27,4 +27,5 @@ LL |     foo((), drop)
 
 error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0271`.
+Some errors have detailed explanations: E0271, E0631.
+For more information about an error, try `rustc --explain E0271`.

src/test/ui/mismatched_types/E0631.stderr

@@ -46,3 +46,4 @@ LL |     bar(f);
 
 error: aborting due to 4 previous errors
 
+For more information about this error, try `rustc --explain E0631`.

src/test/ui/mismatched_types/closure-arg-type-mismatch.stderr

@@ -45,4 +45,5 @@ LL |     baz(f);
 
 error: aborting due to 5 previous errors
 
-For more information about this error, try `rustc --explain E0271`.
+Some errors have detailed explanations: E0271, E0631.
+For more information about an error, try `rustc --explain E0271`.

src/test/ui/mismatched_types/closure-mismatch.stderr

@@ -24,4 +24,5 @@ LL |     baz(|_| ());
 
 error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0271`.
+Some errors have detailed explanations: E0271, E0631.
+For more information about an error, try `rustc --explain E0271`.

src/test/ui/mismatched_types/fn-variance-1.stderr

@@ -24,3 +24,4 @@ LL |     apply(&mut 3, takes_imm);
 
 error: aborting due to 2 previous errors
 
+For more information about this error, try `rustc --explain E0631`.

src/test/ui/mismatched_types/issue-36053-2.stderr

@@ -18,4 +18,5 @@ LL |     once::<&str>("str").fuse().filter(|a: &str| true).count();
 
 error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0599`.
+Some errors have detailed explanations: E0599, E0631.
+For more information about an error, try `rustc --explain E0599`.

src/test/ui/mismatched_types/unboxed-closures-vtable-mismatch.stderr

@@ -12,3 +12,4 @@ LL |     let z = call_it(3, f);
 
 error: aborting due to previous error
 
+For more information about this error, try `rustc --explain E0631`.