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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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| .. | ||
| auxiliary | ||
| arguments.rs | ||
| arguments.stderr | ||
| assoc_item_ctxt.rs | ||
| assoc_item_ctxt.stderr | ||
| assoc_ty_bindings.rs | ||
| cross-crate-codegen-attrs.rs | ||
| cross-crate-define-and-use.rs | ||
| cross-crate-fields.rs | ||
| cross-crate-glob-hygiene.rs | ||
| cross-crate-glob-hygiene.stderr | ||
| cross-crate-methods.rs | ||
| cross-crate-name-collision.rs | ||
| cross-crate-name-hiding-2.rs | ||
| cross-crate-name-hiding-2.stderr | ||
| cross-crate-name-hiding.rs | ||
| cross-crate-name-hiding.stderr | ||
| cross-crate-redefine.rs | ||
| cross-crate-redefine.stderr | ||
| cross-crate-variants.rs | ||
| dollar-crate-modern.rs | ||
| duplicate_lifetimes.rs | ||
| duplicate_lifetimes.stderr | ||
| eager-from-opaque-2.rs | ||
| eager-from-opaque.rs | ||
| expansion-info-reset.rs | ||
| expansion-info-reset.stderr | ||
| extern-prelude-from-opaque-fail-2018.rs | ||
| extern-prelude-from-opaque-fail-2018.stderr | ||
| extern-prelude-from-opaque-fail.rs | ||
| extern-prelude-from-opaque-fail.stderr | ||
| fields-definition.rs | ||
| fields-definition.stderr | ||
| fields-move.rs | ||
| fields-move.stderr | ||
| fields-numeric-borrowck.rs | ||
| fields-numeric-borrowck.stderr | ||
| fields.rs | ||
| fields.stderr | ||
| for-loop.rs | ||
| for-loop.stderr | ||
| format-args.rs | ||
| generate-mod.rs | ||
| generate-mod.stderr | ||
| generic_params.rs | ||
| globs.rs | ||
| globs.stderr | ||
| hir-res-hygiene.rs | ||
| hygiene-dodging-1.rs | ||
| hygiene.rs | ||
| hygienic-label-1.rs | ||
| hygienic-label-1.stderr | ||
| hygienic-label-2.rs | ||
| hygienic-label-2.stderr | ||
| hygienic-label-3.rs | ||
| hygienic-label-3.stderr | ||
| hygienic-label-4.rs | ||
| hygienic-label-4.stderr | ||
| hygienic-labels-in-let.rs | ||
| hygienic-labels.rs | ||
| impl_items-2.rs | ||
| impl_items-2.stderr | ||
| impl_items.rs | ||
| impl_items.stderr | ||
| intercrate.rs | ||
| intercrate.stderr | ||
| issue-15221.rs | ||
| issue-32922.rs | ||
| issue-40847.rs | ||
| issue-44128.rs | ||
| issue-47311.rs | ||
| issue-47312.rs | ||
| issue-61574-const-parameters.rs | ||
| issue-77523-def-site-async-await.rs | ||
| items.rs | ||
| lambda-var-hygiene.rs | ||
| legacy_interaction.rs | ||
| lexical.rs | ||
| local_inner_macros.rs | ||
| macro-metavars-legacy.rs | ||
| macro-metavars-transparent.rs | ||
| missing-self-diag.rs | ||
| missing-self-diag.stderr | ||
| nested_macro_privacy.rs | ||
| nested_macro_privacy.stderr | ||
| nested-dollar-crate.rs | ||
| no_implicit_prelude-2018.rs | ||
| no_implicit_prelude-2018.stderr | ||
| no_implicit_prelude-2021.rs | ||
| no_implicit_prelude.rs | ||
| no_implicit_prelude.stderr | ||
| panic-location.rs | ||
| panic-location.run.stderr | ||
| pattern-macro.rs | ||
| pattern-macro.stderr | ||
| prelude-import-hygiene.rs | ||
| privacy-early.rs | ||
| privacy-early.stderr | ||
| privacy.rs | ||
| privacy.stderr | ||
| rustc-macro-transparency.rs | ||
| rustc-macro-transparency.stderr | ||
| specialization.rs | ||
| stdlib-prelude-from-opaque-early.rs | ||
| stdlib-prelude-from-opaque-late.rs | ||
| thread-local-not-in-prelude.rs | ||
| trait_items-2.rs | ||
| trait_items.rs | ||
| trait_items.stderr | ||
| traits-in-scope.rs | ||
| transparent-basic.rs | ||
| unpretty-debug.rs | ||
| unpretty-debug.stdout | ||
| wrap_unhygienic_example.rs | ||
| xcrate.rs | ||