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Stabilize `type_name_of_val` Make the following API stable: ```rust // in core::any pub fn type_name_of_val<T: ?Sized>(_val: &T) -> &'static str ``` This is a convenience method to get the type name of a value, as opposed to `type_name` that takes a type as a generic. Const stability is not added because this relies on `type_name` which is also not const. That has a blocking issue https://github.com/rust-lang/rust/issues/97156. Wording was also changed to direct most of the details to `type_name` so we don't have as much duplicated documentation. Fixes tracking issue #66359. There were two main concerns in the tracking issue: 1. Naming: `type_name_of` and `type_name_of_val` seem like the only mentioned options. Differences in opinion here come from `std::mem::{size_of, align_of, size_of_val, align_of_val}`. This PR leaves the name as `type_name_of_val`, but I can change if desired since it is pretty verbose. 2. What this displays for `&dyn`: I don't think that having `type_name_of_val` function resolve those is worth the headache it would be, see https://github.com/rust-lang/rust/issues/66359#issuecomment-1718480774 for some workarounds. I also amended the docs wording to leave it open-ended, in case we have means to change that behavior in the future. ``@rustbot`` label -T-libs +T-libs-api +needs-fcp r? libs-api |
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