Null fn lints Adds lints to check for code, that assumes nullable `fn()`. ### Lint examples: `transmute_null_to_fn`: ```rust error: transmuting a known null pointer into a function pointer --> $DIR/transmute_null_to_fn.rs:9:23 | LL | let _: fn() = std::mem::transmute(std::ptr::null::<()>()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this transmute results in undefined behavior | = help: try wrapping your function pointer type in `Option<T>` instead, and using `None` as a null pointer value ``` `fn_null_check`: ```rust error: function pointer assumed to be nullable, even though it isn't --> $DIR/fn_null_check.rs:13:8 | LL | if (fn_ptr as *mut ()).is_null() {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = help: try wrapping your function pointer type in `Option<T>` instead, and using `is_none` to check for null pointer value ``` Closes rust-lang#1644 --- changelog: Improvement: [`transmuting_null`]: Now detects `const` pointers to all types [rust-lang#10099](rust-lang/rust-clippy#10099) changelog: New lint: [`transmute_null_to_fn`] [rust-lang#10099](rust-lang/rust-clippy#10099) changelog: New lint: [`fn_null_check`] [rust-lang#10099](rust-lang/rust-clippy#10099)

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Relinquish the alignof keyword in rustrt #1644

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