error: you are getting the inner pointer of a temporary `CString`
 --> $DIR/cstring.rs:7:5
  |
7 |     CString::new("foo").unwrap().as_ptr();
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: `-D temporary-cstring-as-ptr` implied by `-D warnings`
  = note: that pointer will be invalid outside this expression
help: assign the `CString` to a variable to extend its lifetime
 --> $DIR/cstring.rs:7:5
  |
7 |     CString::new("foo").unwrap().as_ptr();
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error