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ee5d8d37ba
Replace `NestedVisitorMap` with generic `NestedFilter`
This is an attempt to make the `intravisit::Visitor` API simpler and "more const" with regard to nested visiting.
With this change, `intravisit::Visitor` does not visit nested things by default, unless you specify `type NestedFilter = nested_filter::OnlyBodies` (or `All`). `nested_visit_map` returns `Self::Map` instead of `NestedVisitorMap<Self::Map>`. It panics by default (unreachable if `type NestedFilter` is omitted).
One somewhat trixty thing here is that `nested_filter::{OnlyBodies, All}` live in `rustc_middle` so that they may have `type Map = map::Map` and so that `impl Visitor`s never need to specify `type Map` - it has a default of `Self::NestedFilter::Map`.
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| .. | ||
| liveness | ||
| check_attr.rs | ||
| check_const.rs | ||
| dead.rs | ||
| diagnostic_items.rs | ||
| entry.rs | ||
| hir_id_validator.rs | ||
| hir_stats.rs | ||
| intrinsicck.rs | ||
| lang_items.rs | ||
| layout_test.rs | ||
| lib_features.rs | ||
| lib.rs | ||
| liveness.rs | ||
| loops.rs | ||
| naked_functions.rs | ||
| reachable.rs | ||
| region.rs | ||
| stability.rs | ||
| upvars.rs | ||
| weak_lang_items.rs | ||