fix unary minus on usize and unused variable errors in .fixed file

Author: Ryan1729

tests/ui/transmutes_expressible_as_ptr_casts.fixed

@@ -15,54 +15,54 @@ fn main() {
     // the casts, since the casts are the recommended fixes.
 
     // e is an integer and U is *U_0, while U_0: Sized; addr-ptr-cast
-    let ptr_i32_transmute = unsafe {
-        -1 as *const i32
+    let _ptr_i32_transmute = unsafe {
+        usize::MAX as *const i32
     };
-    let ptr_i32 = -1isize as *const i32;
+    let ptr_i32 = usize::MAX as *const i32;
 
     // e has type *T, U is *U_0, and either U_0: Sized ...
-    let ptr_i8_transmute = unsafe {
+    let _ptr_i8_transmute = unsafe {
         ptr_i32 as *const i8
     };
-    let ptr_i8 = ptr_i32 as *const i8;
+    let _ptr_i8 = ptr_i32 as *const i8;
 
     let slice_ptr = &[0,1,2,3] as *const [i32];
 
     // ... or pointer_kind(T) = pointer_kind(U_0); ptr-ptr-cast
-    let ptr_to_unsized_transmute = unsafe {
+    let _ptr_to_unsized_transmute = unsafe {
         slice_ptr as *const [u16]
     };
-    let ptr_to_unsized = slice_ptr as *const [u16];
+    let _ptr_to_unsized = slice_ptr as *const [u16];
     // TODO: We could try testing vtable casts here too, but maybe
     // we should wait until std::raw::TraitObject is stabilized?
 
     // e has type *T and U is a numeric type, while T: Sized; ptr-addr-cast
-    let usize_from_int_ptr_transmute = unsafe {
+    let _usize_from_int_ptr_transmute = unsafe {
         ptr_i32 as usize
     };
-    let usize_from_int_ptr = ptr_i32 as usize;
+    let _usize_from_int_ptr = ptr_i32 as usize;
 
     let array_ref: &[i32; 4] = &[1,2,3,4];
 
     // e has type &[T; n] and U is *const T; array-ptr-cast
-    let array_ptr_transmute = unsafe {
+    let _array_ptr_transmute = unsafe {
         array_ref as *const [i32; 4]
     };
-    let array_ptr = array_ref as *const [i32; 4];
+    let _array_ptr = array_ref as *const [i32; 4];
 
     fn foo(_: usize) -> u8 { 42 }
 
     // e is a function pointer type and U has type *T, while T: Sized; fptr-ptr-cast
-    let usize_ptr_transmute = unsafe {
+    let _usize_ptr_transmute = unsafe {
         foo as *const usize
     };
-    let usize_ptr_transmute = foo as *const usize;
+    let _usize_ptr_transmute = foo as *const usize;
 
     // e is a function pointer type and U is an integer; fptr-addr-cast
-    let usize_from_fn_ptr_transmute = unsafe {
+    let _usize_from_fn_ptr_transmute = unsafe {
         foo as usize
     };
-    let usize_from_fn_ptr = foo as *const usize;
+    let _usize_from_fn_ptr = foo as *const usize;
 }
 
 // If a ref-to-ptr cast of this form where the pointer type points to a type other

tests/ui/transmutes_expressible_as_ptr_casts.rs

@@ -15,54 +15,54 @@ fn main() {
     // the casts, since the casts are the recommended fixes.
 
     // e is an integer and U is *U_0, while U_0: Sized; addr-ptr-cast
-    let ptr_i32_transmute = unsafe {
-        transmute::<isize, *const i32>(-1)
+    let _ptr_i32_transmute = unsafe {
+        transmute::<usize, *const i32>(usize::MAX)
     };
-    let ptr_i32 = -1isize as *const i32;
+    let ptr_i32 = usize::MAX as *const i32;
 
     // e has type *T, U is *U_0, and either U_0: Sized ...
-    let ptr_i8_transmute = unsafe {
+    let _ptr_i8_transmute = unsafe {
         transmute::<*const i32, *const i8>(ptr_i32)
     };
-    let ptr_i8 = ptr_i32 as *const i8;
+    let _ptr_i8 = ptr_i32 as *const i8;
 
     let slice_ptr = &[0,1,2,3] as *const [i32];
 
     // ... or pointer_kind(T) = pointer_kind(U_0); ptr-ptr-cast
-    let ptr_to_unsized_transmute = unsafe {
+    let _ptr_to_unsized_transmute = unsafe {
         transmute::<*const [i32], *const [u16]>(slice_ptr)
     };
-    let ptr_to_unsized = slice_ptr as *const [u16];
+    let _ptr_to_unsized = slice_ptr as *const [u16];
     // TODO: We could try testing vtable casts here too, but maybe
     // we should wait until std::raw::TraitObject is stabilized?
 
     // e has type *T and U is a numeric type, while T: Sized; ptr-addr-cast
-    let usize_from_int_ptr_transmute = unsafe {
+    let _usize_from_int_ptr_transmute = unsafe {
         transmute::<*const i32, usize>(ptr_i32)
     };
-    let usize_from_int_ptr = ptr_i32 as usize;
+    let _usize_from_int_ptr = ptr_i32 as usize;
 
     let array_ref: &[i32; 4] = &[1,2,3,4];
 
     // e has type &[T; n] and U is *const T; array-ptr-cast
-    let array_ptr_transmute = unsafe {
+    let _array_ptr_transmute = unsafe {
         transmute::<&[i32; 4], *const [i32; 4]>(array_ref)
     };
-    let array_ptr = array_ref as *const [i32; 4];
+    let _array_ptr = array_ref as *const [i32; 4];
 
     fn foo(_: usize) -> u8 { 42 }
 
     // e is a function pointer type and U has type *T, while T: Sized; fptr-ptr-cast
-    let usize_ptr_transmute = unsafe {
+    let _usize_ptr_transmute = unsafe {
         transmute::<fn(usize) -> u8, *const usize>(foo)
     };
-    let usize_ptr_transmute = foo as *const usize;
+    let _usize_ptr_transmute = foo as *const usize;
 
     // e is a function pointer type and U is an integer; fptr-addr-cast
-    let usize_from_fn_ptr_transmute = unsafe {
+    let _usize_from_fn_ptr_transmute = unsafe {
         transmute::<fn(usize) -> u8, usize>(foo)
     };
-    let usize_from_fn_ptr = foo as *const usize;
+    let _usize_from_fn_ptr = foo as *const usize;
 }
 
 // If a ref-to-ptr cast of this form where the pointer type points to a type other

tests/ui/transmutes_expressible_as_ptr_casts.stderr

@@ -1,8 +1,8 @@
 error: transmute from an integer to a pointer
   --> $DIR/transmutes_expressible_as_ptr_casts.rs:19:9
    |
-LL |         transmute::<isize, *const i32>(-1)
-   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `-1 as *const i32`
+LL |         transmute::<usize, *const i32>(usize::MAX)
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `usize::MAX as *const i32`
    |
    = note: `-D clippy::useless-transmute` implied by `-D warnings`