error: crate root imports need to be explicitly named: `use crate as name;`
  --> $DIR/single-segment.rs:15:5
   |
LL | use crate; //~ ERROR crate root imports need to be explicitly named: `use crate as name;`
   |     ^^^^^

error: cannot glob-import all possible crates
  --> $DIR/single-segment.rs:16:5
   |
LL | use *; //~ ERROR cannot glob-import all possible crates
   |     ^

error[E0423]: expected value, found module `xcrate`
  --> $DIR/single-segment.rs:19:13
   |
LL |     let s = ::xcrate; //~ ERROR expected value, found module `xcrate`
   |             ^^^^^^^^ not a value

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0423`.