Update the rest of the test suites to use dyn

src/test/compile-fail/issue-23595-1.rs

@@ -5,7 +5,7 @@ use std::ops::{Index};
 trait Hierarchy {
     type Value;
     type ChildKey;
-    type Children = Index<Self::ChildKey, Output=Hierarchy>;
+    type Children = dyn Index<Self::ChildKey, Output=dyn Hierarchy>;
     //~^ ERROR: the value of the associated types `Value` (from the trait `Hierarchy`), `ChildKey`
 
     fn data(&self) -> Option<(Self::Value, Self::Children)>;

src/test/run-pass-fulldeps/pprust-expr-roundtrip.rs

@@ -62,7 +62,7 @@ fn make_x() -> P<Expr> {
 /// Iterate over exprs of depth up to `depth`. The goal is to explore all "interesting"
 /// combinations of expression nesting. For example, we explore combinations using `if`, but not
 /// `while` or `match`, since those should print and parse in much the same way as `if`.
-fn iter_exprs(depth: usize, f: &mut FnMut(P<Expr>)) {
+fn iter_exprs(depth: usize, f: &mut dyn FnMut(P<Expr>)) {
     if depth == 0 {
         f(make_x());
         return;