22 lines
484 B
Rust
22 lines
484 B
Rust
#![feature(ptr_metadata, layout_for_ptr)]
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use std::{mem, ptr};
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trait Foo {}
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impl Foo for u32 {}
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fn uwu(thin: *const (), meta: &'static ()) -> *const dyn Foo {
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ptr::from_raw_parts(thin, unsafe { mem::transmute(meta) })
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}
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fn main() {
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unsafe {
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let orig = 1_u32;
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let x = &orig as &dyn Foo;
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let (ptr, meta) = (x as *const dyn Foo).to_raw_parts();
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let ptr = uwu(ptr, mem::transmute(meta));
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let _size = mem::size_of_val_raw(ptr);
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}
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}
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