| warning: lint `temporary_cstring_as_ptr` has been renamed to `dangling_pointers_from_temporaries` |
| --> $DIR/cstring-as-ptr.rs:2:9 |
| | |
| LL | #![deny(temporary_cstring_as_ptr)] |
| | ^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `dangling_pointers_from_temporaries` |
| | |
| = note: `#[warn(renamed_and_removed_lints)]` on by default |
| |
| error: a dangling pointer will be produced because the temporary `CString` will be dropped |
| --> $DIR/cstring-as-ptr.rs:15:48 |
| | |
| LL | let s = CString::new("some text").unwrap().as_ptr(); |
| | ---------------------------------- ^^^^^^ this pointer will immediately be invalid |
| | | |
| | this `CString` is deallocated at the end of the statement, bind it to a variable to extend its lifetime |
| | |
| = note: pointers do not have a lifetime; when calling `as_ptr` the `CString` will be deallocated at the end of the statement because nothing is referencing it as far as the type system is concerned |
| = help: you must make sure that the variable you bind the `CString` to lives at least as long as the pointer returned by the call to `as_ptr` |
| = help: in particular, if this pointer is returned from the current function, binding the `CString` inside the function will not suffice |
| = help: for more information, see <https://doc.rust-lang.org/reference/destructors.html> |
| note: the lint level is defined here |
| --> $DIR/cstring-as-ptr.rs:2:9 |
| | |
| LL | #![deny(temporary_cstring_as_ptr)] |
| | ^^^^^^^^^^^^^^^^^^^^^^^^ |
| |
| error: a dangling pointer will be produced because the temporary `CString` will be dropped |
| --> $DIR/cstring-as-ptr.rs:9:52 |
| | |
| LL | let s = CString::new("some text").unwrap().as_ptr(); |
| | ---------------------------------- ^^^^^^ this pointer will immediately be invalid |
| | | |
| | this `CString` is deallocated at the end of the statement, bind it to a variable to extend its lifetime |
| ... |
| LL | mymacro!(); |
| | ---------- in this macro invocation |
| | |
| = note: pointers do not have a lifetime; when calling `as_ptr` the `CString` will be deallocated at the end of the statement because nothing is referencing it as far as the type system is concerned |
| = help: you must make sure that the variable you bind the `CString` to lives at least as long as the pointer returned by the call to `as_ptr` |
| = help: in particular, if this pointer is returned from the current function, binding the `CString` inside the function will not suffice |
| = help: for more information, see <https://doc.rust-lang.org/reference/destructors.html> |
| = note: this error originates in the macro `mymacro` (in Nightly builds, run with -Z macro-backtrace for more info) |
| |
| error: aborting due to 2 previous errors; 1 warning emitted |
| |
