error: expected identifier, found keyword `dyn`
  --> $DIR/dyn-trait-compatibility.rs:4:16
   |
LL | type A1 = dyn::dyn;
   |                ^^^ expected identifier, found keyword
help: you can escape reserved keywords to use them as identifiers
   |
LL | type A1 = dyn::r#dyn;
   |                ^^^^^

error: expected identifier, found `<`
  --> $DIR/dyn-trait-compatibility.rs:5:14
   |
LL | type A2 = dyn<dyn, dyn>;
   |              ^ expected identifier

error: aborting due to 2 previous errors