Add .stderr files from running ./x.py test --bless

Author: nvlbg

src/test/ui/issues/issue-20971.stderr

@@ -0,0 +1,8 @@
+warning: trait objects without an explicit `dyn` are deprecated
+  --> $DIR/issue-20971.rs:16:22
+   |
+LL | pub fn many() -> Box<Parser<Input = <() as Parser>::Input> + 'static> {
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Parser<Input = <() as Parser>::Input> + 'static`
+   |
+   = note: `#[warn(bare_trait_objects)]` on by default
+

src/test/ui/issues/issue-2444.stderr

@@ -0,0 +1,14 @@
+warning: type `e` should have an upper camel case name
+  --> $DIR/issue-2444.rs:6:6
+   |
+LL | enum e<T> {
+   |      ^ help: convert the identifier to upper camel case: `E`
+   |
+   = note: `#[warn(non_camel_case_types)]` on by default
+
+warning: variant `ee` should have an upper camel case name
+  --> $DIR/issue-2444.rs:7:5
+   |
+LL |     ee(Arc<T>),
+   |     ^^ help: convert the identifier to upper camel case: `Ee`
+