error: you are getting the inner pointer of a temporary `CString` --> $DIR/cstring.rs:7:5 | LL | CString::new("foo").unwrap().as_ptr(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: `#[deny(clippy::temporary_cstring_as_ptr)]` on by default = 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 | LL | CString::new("foo").unwrap().as_ptr(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: aborting due to previous error