1 files changed, 53 insertions, 0 deletions
diff --git a/tests/ui/impl-trait/in-trait/wf-bounds.stderr b/tests/ui/impl-trait/in-trait/wf-bounds.stderr
new file mode 100644
index 000000000..4d60b1330
--- /dev/null
+++ b/tests/ui/impl-trait/in-trait/wf-bounds.stderr
@@ -0,0 +1,53 @@
+error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
+  --> $DIR/wf-bounds.rs:15:22
+   |
+LL |     fn nya() -> impl Wf<Vec<[u8]>>;
+   |                      ^^^^^^^^^^^^^ doesn't have a size known at compile-time
+   |
+   = help: the trait `Sized` is not implemented for `[u8]`
+note: required by a bound in `Vec`
+  --> $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+
+error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
+  --> $DIR/wf-bounds.rs:18:23
+   |
+LL |     fn nya2() -> impl Wf<[u8]>;
+   |                       ^^^^^^^^ doesn't have a size known at compile-time
+   |
+   = help: the trait `Sized` is not implemented for `[u8]`
+note: required by a bound in `Wf`
+  --> $DIR/wf-bounds.rs:8:10
+   |
+LL | trait Wf<T> {
+   |          ^ required by this bound in `Wf`
+help: consider relaxing the implicit `Sized` restriction
+   |
+LL | trait Wf<T: ?Sized> {
+   |           ++++++++
+
+error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
+  --> $DIR/wf-bounds.rs:21:44
+   |
+LL |     fn nya3() -> impl Wf<(), Output = impl Wf<Vec<[u8]>>>;
+   |                                            ^^^^^^^^^^^^^ doesn't have a size known at compile-time
+   |
+   = help: the trait `Sized` is not implemented for `[u8]`
+note: required by a bound in `Vec`
+  --> $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+
+error[E0277]: `T` doesn't implement `std::fmt::Display`
+  --> $DIR/wf-bounds.rs:24:26
+   |
+LL |     fn nya4<T>() -> impl Wf<NeedsDisplay<T>>;
+   |                          ^^^^^^^^^^^^^^^^^^^ `T` cannot be formatted with the default formatter
+   |
+   = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
+note: required by a bound in `NeedsDisplay`
+  --> $DIR/wf-bounds.rs:12:24
+   |
+LL | struct NeedsDisplay<T: Display>(T);
+   |                        ^^^^^^^ required by this bound in `NeedsDisplay`
+
+error: aborting due to 4 previous errors
+
+For more information about this error, try `rustc --explain E0277`.