mirror of https://github.com/rust-lang/rust
230 lines
9.1 KiB
Plaintext
230 lines
9.1 KiB
Plaintext
warning: function pointers are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:12:8
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LL | if (fn_ptr as *mut ()).is_null() {}
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| ^------^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `fn() {main}`
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= help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
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= note: `#[warn(useless_ptr_null_checks)]` on by default
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warning: function pointers are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:14:8
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LL | if (fn_ptr as *const u8).is_null() {}
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| ^------^^^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `fn() {main}`
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= help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
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warning: function pointers are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:16:8
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LL | if (fn_ptr as *const ()) == std::ptr::null() {}
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| ^------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `fn() {main}`
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= help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
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warning: function pointers are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:18:8
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LL | if (fn_ptr as *mut ()) == std::ptr::null_mut() {}
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| ^------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `fn() {main}`
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= help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
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warning: function pointers are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:20:8
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LL | if (fn_ptr as *const ()) == (0 as *const ()) {}
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| ^------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `fn() {main}`
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= help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
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warning: function pointers are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:22:8
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LL | if <*const _>::is_null(fn_ptr as *const ()) {}
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| ^^^^^^^^^^^^^^^^^^^^------^^^^^^^^^^^^^^
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| expression has type `fn() {main}`
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= help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
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warning: function pointers are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:24:8
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LL | if (fn_ptr as *mut fn() as *const fn() as *const ()).is_null() {}
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| ^------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `fn() {main}`
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= help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
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warning: function pointers are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:26:8
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LL | if (fn_ptr as *mut fn() as *const fn()).cast_mut().is_null() {}
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| ^------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `fn() {main}`
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= help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
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warning: function pointers are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:28:8
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LL | if ((fn_ptr as *mut fn()).cast() as *const fn()).cast_mut().is_null() {}
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| ^^------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `fn() {main}`
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= help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
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warning: function pointers are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:30:8
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LL | if (fn_ptr as fn() as *const ()).is_null() {}
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| ^--------------^^^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `fn()`
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= help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
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warning: function pointers are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:32:8
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LL | if (c_fn as *const fn()).is_null() {}
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| ^----^^^^^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `extern "C" fn() {c_fn}`
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= help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
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warning: references are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:36:8
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LL | if (&mut 8 as *mut i32).is_null() {}
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| ^------^^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `&mut i32`
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warning: returned pointer of `from_mut` call is never null, so checking it for null will always return false
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--> $DIR/ptr_null_checks.rs:38:8
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LL | if ptr::from_mut(&mut 8).is_null() {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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warning: references are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:40:8
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LL | if (&8 as *const i32).is_null() {}
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| ^--^^^^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `&i32`
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warning: returned pointer of `from_ref` call is never null, so checking it for null will always return false
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--> $DIR/ptr_null_checks.rs:42:8
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LL | if ptr::from_ref(&8).is_null() {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
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warning: returned pointer of `from_ref` call is never null, so checking it for null will always return false
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--> $DIR/ptr_null_checks.rs:44:8
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LL | if ptr::from_ref(&8).cast_mut().is_null() {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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warning: returned pointer of `from_ref` call is never null, so checking it for null will always return false
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--> $DIR/ptr_null_checks.rs:46:8
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LL | if (ptr::from_ref(&8).cast_mut() as *mut i32).is_null() {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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warning: references are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:48:8
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LL | if (&8 as *const i32) == std::ptr::null() {}
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| ^--^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `&i32`
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warning: references are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:51:8
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LL | if (ref_num as *const i32) == std::ptr::null() {}
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| ^-------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `&i32`
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warning: references are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:53:8
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LL | if (b"\0" as *const u8).is_null() {}
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| ^-----^^^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `&[u8; 1]`
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warning: references are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:55:8
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LL | if ("aa" as *const str).is_null() {}
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| ^----^^^^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `&str`
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warning: references are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:57:8
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LL | if (&[1, 2] as *const i32).is_null() {}
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| ^-------^^^^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `&[i32; 2]`
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warning: references are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:59:8
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LL | if (&mut [1, 2] as *mut i32) == std::ptr::null_mut() {}
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| ^-----------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `&mut [i32; 2]`
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warning: references are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:61:8
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LL | if (static_i32() as *const i32).is_null() {}
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| ^------------^^^^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `&i32`
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warning: references are not nullable, so checking them for null will always return false
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--> $DIR/ptr_null_checks.rs:63:8
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LL | if (&*{ static_i32() } as *const i32).is_null() {}
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| ^------------------^^^^^^^^^^^^^^^^^^^^^^^^^
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| expression has type `&i32`
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warning: returned pointer of `as_ptr` call is never null, so checking it for null will always return false
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--> $DIR/ptr_null_checks.rs:67:8
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LL | if ptr::NonNull::new(&mut 8).unwrap().as_ptr().is_null() {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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warning: returned pointer of `as_ptr` call is never null, so checking it for null will always return false
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--> $DIR/ptr_null_checks.rs:69:8
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LL | if ptr::NonNull::<u8>::dangling().as_ptr().is_null() {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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warning: 27 warnings emitted
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