error: expected identifier, found `!`
  --> $DIR/macro-interpolation.rs:21:19
   |
LL |         <$type as $trait>::$name
   |                   ^^^^^^ expected identifier
...
LL |     let _: qpath!(ty, <str as !>::Owned);
   |            -----------------------------
   |            |
   |            this macro call doesn't expand to a type
   |            in this macro invocation
   |
   = note: this error originates in the macro `qpath` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to previous error