21867225a7
Make `mem::size_of_val` and `mem::align_of_val` unstably const Implements #46571 but does not stabilize it. I wanted this while working on something today. The only reason not to immediately stabilize are concerns around [custom DSTs](https://github.com/rust-lang/rust/issues/46571#issuecomment-387669352). That proposal has made zero progress in the last two years and const eval is rich enough to support pretty much any user-defined `len` function as long as nightly features are allowed (`raw_ptr_deref`). Currently, this raises a `const_err` lint when passed an `extern type`. r? @oli-obk cc @rust-lang/wg-const-eval |
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| .. | ||
| alloc | ||
| core | ||
| panic_abort | ||
| panic_unwind | ||
| proc_macro | ||
| profiler_builtins | ||
| rtstartup | ||
| rustc-std-workspace-alloc | ||
| rustc-std-workspace-core | ||
| rustc-std-workspace-std | ||
| std | ||
| stdarch@311d56cd91 | ||
| term | ||
| test | ||
| unwind | ||