Rework precise capturing syntax

tests/ui/impl-trait/precise-capturing/unexpected-token.rs

@@ -2,7 +2,7 @@
 // token due to a strange interaction between the sequence parsing code and the
 // param/lifetime parsing code.
 
-fn hello() -> impl use<'a {}> Sized {}
+fn hello() -> impl Sized + use<'a {}> {}
 //~^ ERROR expected one of `,` or `>`, found `{`
 
 fn main() {}