// this program is not technically incorrect, but is an obscure enough style to be worth linting #![deny(temporary_cstring_as_ptr)] //~^ WARNING lint `temporary_cstring_as_ptr` has been renamed to `dangling_pointers_from_temporaries` use std::ffi::CString; macro_rules! mymacro { () => { let s = CString::new("some text").unwrap().as_ptr(); //~^ ERROR a dangling pointer will be produced because the temporary `CString` will be dropped } } fn main() { let s = CString::new("some text").unwrap().as_ptr(); //~^ ERROR a dangling pointer will be produced because the temporary `CString` will be dropped mymacro!(); }