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The rules for casting `*mut X<dyn A>` -> `*mut Y<dyn B>` are as follows: - If `B` has a principal - `A` must have exactly the same principal (including generics) - Auto traits of `B` must be a subset of autotraits in `A` Note that `X<_>` and `Y<_>` can be identity, or arbitrary structs with last field being the dyn type. The lifetime of the trait object itself (`dyn ... + 'a`) is not checked. This prevents a few soundness issues with `#![feature(arbitrary_self_types)]` and trait upcasting. Namely, these checks make sure that vtable is always valid for the pointee. |
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| .. | ||
| constraints | ||
| diagnostics | ||
| polonius | ||
| region_infer | ||
| type_check | ||
| util | ||
| borrow_set.rs | ||
| borrowck_errors.rs | ||
| consumers.rs | ||
| dataflow.rs | ||
| def_use.rs | ||
| facts.rs | ||
| lib.rs | ||
| location.rs | ||
| member_constraints.rs | ||
| nll.rs | ||
| path_utils.rs | ||
| place_ext.rs | ||
| places_conflict.rs | ||
| prefixes.rs | ||
| renumber.rs | ||
| session_diagnostics.rs | ||
| universal_regions.rs | ||
| used_muts.rs | ||