error: expected type, found `42`
  --> $DIR/issue-34255-1.rs:8:24
   |
LL |     Test::Drill(field: 42);
   |                        ^^ expecting a type here because of type ascription
   |
   = note: type ascription is a nightly only feature that lets you annotate expressions with a type: `<expr>: <type>`
note: this expression is annotated with type ascription...
  --> $DIR/issue-34255-1.rs:8:17
   |
LL |     Test::Drill(field: 42);
   |                 ^^^^^
note: ...due to this, which is why a type is expected after
  --> $DIR/issue-34255-1.rs:8:22
   |
LL |     Test::Drill(field: 42);
   |                      ^
   = help: this might be indicative of a syntax error elsewhere

error: aborting due to previous error