Niche layout enum variants do not get distinct type names that include type parameters which can cause duplicate type names for variants like Option::Some. This in turn will causes debugger to randomly pick one of the various type layouts when inspecting values which can cause invalid results.
fn main() {
let a = Some(&1u8);
let b = Some(&2u16);
let c = Some(&3u32);
let d = Some(&4u64);
let e = Some(&5i8);
let f = Some(&6i64);
std::process::exit(0); // bp here
}
Notice the values for a, b and c are totally wrong because they are using the layout for Option<&i64>::Some. The types for the other variables are also wrong but that doesn't happen to cause issues in this particular instance.
Niche layout enum variants do not get distinct type names that include type parameters which can cause duplicate type names for variants like
Option::Some. This in turn will causes debugger to randomly pick one of the various type layouts when inspecting values which can cause invalid results.Notice the values for
a,bandcare totally wrong because they are using the layout forOption<&i64>::Some. The types for the other variables are also wrong but that doesn't happen to cause issues in this particular instance.