rust/tests/ui/lint/ptr_null_checks.stderr

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warning: function pointers are not nullable, so checking them for null will always return false
--> $DIR/ptr_null_checks.rs:7:8
|
LL | if (fn_ptr as *mut ()).is_null() {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
= note: `#[warn(useless_ptr_null_checks)]` on by default
warning: function pointers are not nullable, so checking them for null will always return false
--> $DIR/ptr_null_checks.rs:9:8
|
LL | if (fn_ptr as *const u8).is_null() {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
warning: function pointers are not nullable, so checking them for null will always return false
--> $DIR/ptr_null_checks.rs:11:8
|
LL | if (fn_ptr as *const ()) == std::ptr::null() {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
warning: function pointers are not nullable, so checking them for null will always return false
--> $DIR/ptr_null_checks.rs:13:8
|
LL | if (fn_ptr as *mut ()) == std::ptr::null_mut() {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
warning: function pointers are not nullable, so checking them for null will always return false
--> $DIR/ptr_null_checks.rs:15:8
|
LL | if (fn_ptr as *const ()) == (0 as *const ()) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
warning: function pointers are not nullable, so checking them for null will always return false
--> $DIR/ptr_null_checks.rs:17:8
|
LL | if <*const _>::is_null(fn_ptr as *const ()) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
warning: function pointers are not nullable, so checking them for null will always return false
--> $DIR/ptr_null_checks.rs:19:8
|
LL | if (fn_ptr as *mut fn() as *const fn() as *const ()).is_null() {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
warning: function pointers are not nullable, so checking them for null will always return false
--> $DIR/ptr_null_checks.rs:21:8
|
LL | if (fn_ptr as fn() as *const ()).is_null() {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
warning: references are not nullable, so checking them for null will always return false
--> $DIR/ptr_null_checks.rs:25:8
|
LL | if (&mut 8 as *mut i32).is_null() {}
| ^------^^^^^^^^^^^^^^^^^^^^^^^
| |
| expression has type `&mut i32`
warning: references are not nullable, so checking them for null will always return false
--> $DIR/ptr_null_checks.rs:27:8
|
LL | if (&8 as *const i32).is_null() {}
| ^--^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| expression has type `&i32`
warning: references are not nullable, so checking them for null will always return false
--> $DIR/ptr_null_checks.rs:29:8
|
LL | if (&8 as *const i32) == std::ptr::null() {}
| ^--^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| expression has type `&i32`
warning: references are not nullable, so checking them for null will always return false
--> $DIR/ptr_null_checks.rs:32:8
|
LL | if (ref_num as *const i32) == std::ptr::null() {}
| ^-------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| expression has type `&i32`
warning: references are not nullable, so checking them for null will always return false
--> $DIR/ptr_null_checks.rs:34:8
|
LL | if (b"\0" as *const u8).is_null() {}
| ^-----^^^^^^^^^^^^^^^^^^^^^^^^
| |
| expression has type `&[u8; 1]`
warning: references are not nullable, so checking them for null will always return false
--> $DIR/ptr_null_checks.rs:36:8
|
LL | if ("aa" as *const str).is_null() {}
| ^----^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| expression has type `&str`
warning: references are not nullable, so checking them for null will always return false
--> $DIR/ptr_null_checks.rs:38:8
|
LL | if (&[1, 2] as *const i32).is_null() {}
| ^-------^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| expression has type `&[i32; 2]`
warning: references are not nullable, so checking them for null will always return false
--> $DIR/ptr_null_checks.rs:40:8
|
LL | if (&mut [1, 2] as *mut i32) == std::ptr::null_mut() {}
| ^-----------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| expression has type `&mut [i32; 2]`
warning: 16 warnings emitted