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ptr_metadata test: avoid ptr-to-int transmutes

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This commit is contained in:
Ralf Jung 2022-03-31 09:32:30 -04:00
parent df20355fa9
commit 907ba11490
1 changed files with 5 additions and 5 deletions
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10
library/core/tests/ptr.rs
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@ -490,11 +490,11 @@ fn ptr_metadata() {
let vtable_5: DynMetadata<dyn Display> =
metadata(&Pair(true, 7_u32) as &Pair<bool, dyn Display>);
unsafe {
let address_1: usize = std::mem::transmute(vtable_1);
let address_2: usize = std::mem::transmute(vtable_2);
let address_3: usize = std::mem::transmute(vtable_3);
let address_4: usize = std::mem::transmute(vtable_4);
let address_5: usize = std::mem::transmute(vtable_5);
let address_1: *const () = std::mem::transmute(vtable_1);
let address_2: *const () = std::mem::transmute(vtable_2);
let address_3: *const () = std::mem::transmute(vtable_3);
let address_4: *const () = std::mem::transmute(vtable_4);
let address_5: *const () = std::mem::transmute(vtable_5);
// Different trait => different vtable pointer
assert_ne!(address_1, address_2);
// Different erased type => different vtable pointer