allow lint in transmute_null tests

Author: aaron-ang

tests/ui/transmute_null_to_fn.rs

@@ -1,6 +1,7 @@
 #![allow(dead_code)]
 #![warn(clippy::transmute_null_to_fn)]
 #![allow(clippy::zero_ptr, clippy::missing_transmute_annotations)]
+#![allow(clippy::manual_dangling_ptr)]
 
 // Easy to lint because these only span one line.
 fn one_liners() {
@@ -14,7 +15,7 @@ fn one_liners() {
 }
 
 pub const ZPTR: *const usize = 0 as *const _;
-pub const NOT_ZPTR: *const usize = std::ptr::dangling();
+pub const NOT_ZPTR: *const usize = 1 as *const _;
 
 fn transmute_const() {
     unsafe {

tests/ui/transmute_null_to_fn.stderr

@@ -1,5 +1,5 @@
 error: transmuting a known null pointer into a function pointer
-  --> tests/ui/transmute_null_to_fn.rs:8:23
+  --> tests/ui/transmute_null_to_fn.rs:9:23
    |
 LL |         let _: fn() = std::mem::transmute(0 as *const ());
    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this transmute results in undefined behavior

tests/ui/transmuting_null.rs

@@ -3,6 +3,7 @@
 #![allow(clippy::zero_ptr)]
 #![allow(clippy::transmute_ptr_to_ref)]
 #![allow(clippy::eq_op, clippy::missing_transmute_annotations)]
+#![allow(clippy::manual_dangling_ptr)]
 
 // Easy to lint because these only span one line.
 fn one_liners() {
@@ -16,7 +17,7 @@ fn one_liners() {
 }
 
 pub const ZPTR: *const usize = 0 as *const _;
-pub const NOT_ZPTR: *const usize = std::ptr::dangling();
+pub const NOT_ZPTR: *const usize = 1 as *const _;
 
 fn transmute_const() {
     unsafe {

tests/ui/transmuting_null.stderr

@@ -1,5 +1,5 @@
 error: transmuting a known null pointer into a reference
-  --> tests/ui/transmuting_null.rs:10:23
+  --> tests/ui/transmuting_null.rs:11:23
    |
 LL |         let _: &u64 = std::mem::transmute(0 as *const u64);
    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -8,13 +8,13 @@ LL |         let _: &u64 = std::mem::transmute(0 as *const u64);
    = help: to override `-D warnings` add `#[allow(clippy::transmuting_null)]`
 
 error: transmuting a known null pointer into a reference
-  --> tests/ui/transmuting_null.rs:13:23
+  --> tests/ui/transmuting_null.rs:14:23
    |
 LL |         let _: &u64 = std::mem::transmute(std::ptr::null::<u64>());
    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: transmuting a known null pointer into a reference
-  --> tests/ui/transmuting_null.rs:24:23
+  --> tests/ui/transmuting_null.rs:25:23
    |
 LL |         let _: &u64 = std::mem::transmute(ZPTR);
    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^