1 files changed, 72 insertions, 0 deletions
diff --git a/tests/ui/for/issue-20605.next.stderr b/tests/ui/for/issue-20605.next.stderr
new file mode 100644
index 000000000..d55efedfc
--- /dev/null
+++ b/tests/ui/for/issue-20605.next.stderr
@@ -0,0 +1,72 @@
+error[E0277]: the trait bound `dyn Iterator<Item = &'a mut u8>: IntoIterator` is not satisfied
+  --> $DIR/issue-20605.rs:5:17
+   |
+LL |     for item in *things { *item = 0 }
+   |                 ^^^^^^^ the trait `IntoIterator` is not implemented for `dyn Iterator<Item = &'a mut u8>`
+
+error[E0277]: the size for values of type `<dyn Iterator<Item = &'a mut u8> as IntoIterator>::IntoIter` cannot be known at compilation time
+  --> $DIR/issue-20605.rs:5:17
+   |
+LL |     for item in *things { *item = 0 }
+   |                 ^^^^^^^ doesn't have a size known at compile-time
+   |
+   = help: the trait `Sized` is not implemented for `<dyn Iterator<Item = &'a mut u8> as IntoIterator>::IntoIter`
+   = note: all local variables must have a statically known size
+   = help: unsized locals are gated as an unstable feature
+
+error: the type `<dyn Iterator<Item = &'a mut u8> as IntoIterator>::IntoIter` is not well-formed
+  --> $DIR/issue-20605.rs:5:17
+   |
+LL |     for item in *things { *item = 0 }
+   |                 ^^^^^^^
+
+error[E0277]: `<dyn Iterator<Item = &'a mut u8> as IntoIterator>::IntoIter` is not an iterator
+  --> $DIR/issue-20605.rs:5:17
+   |
+LL |     for item in *things { *item = 0 }
+   |                 ^^^^^^^ `<dyn Iterator<Item = &'a mut u8> as IntoIterator>::IntoIter` is not an iterator
+   |
+   = help: the trait `Iterator` is not implemented for `<dyn Iterator<Item = &'a mut u8> as IntoIterator>::IntoIter`
+
+error: the type `&mut <dyn Iterator<Item = &'a mut u8> as IntoIterator>::IntoIter` is not well-formed
+  --> $DIR/issue-20605.rs:5:17
+   |
+LL |     for item in *things { *item = 0 }
+   |                 ^^^^^^^
+
+error[E0614]: type `<<dyn Iterator<Item = &'a mut u8> as IntoIterator>::IntoIter as Iterator>::Item` cannot be dereferenced
+  --> $DIR/issue-20605.rs:5:27
+   |
+LL |     for item in *things { *item = 0 }
+   |                           ^^^^^
+
+error[E0277]: the size for values of type `<<dyn Iterator<Item = &'a mut u8> as IntoIterator>::IntoIter as Iterator>::Item` cannot be known at compilation time
+  --> $DIR/issue-20605.rs:5:9
+   |
+LL |     for item in *things { *item = 0 }
+   |         ^^^^ doesn't have a size known at compile-time
+   |
+   = help: the trait `Sized` is not implemented for `<<dyn Iterator<Item = &'a mut u8> as IntoIterator>::IntoIter as Iterator>::Item`
+   = note: all local variables must have a statically known size
+   = help: unsized locals are gated as an unstable feature
+
+error: the type `Option<<<dyn Iterator<Item = &'a mut u8> as IntoIterator>::IntoIter as Iterator>::Item>` is not well-formed
+  --> $DIR/issue-20605.rs:5:17
+   |
+LL |     for item in *things { *item = 0 }
+   |                 ^^^^^^^
+
+error[E0277]: the size for values of type `<<dyn Iterator<Item = &'a mut u8> as IntoIterator>::IntoIter as Iterator>::Item` cannot be known at compilation time
+  --> $DIR/issue-20605.rs:5:5
+   |
+LL |     for item in *things { *item = 0 }
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
+   |
+   = help: the trait `Sized` is not implemented for `<<dyn Iterator<Item = &'a mut u8> as IntoIterator>::IntoIter as Iterator>::Item`
+note: required by a bound in `None`
+  --> $SRC_DIR/core/src/option.rs:LL:COL
+
+error: aborting due to 9 previous errors
+
+Some errors have detailed explanations: E0277, E0614.
+For more information about an error, try `rustc --explain E0277`.