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Filter unstable and doc hidden variants in usefulness checking

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Add test cases for unstable variants
Add test cases for doc hidden variants
Move is_doc_hidden to method on TyCtxt
Add unstable variants test to reachable-patterns ui test
Rename reachable-patterns -> omitted-patterns
This commit is contained in:
Devin Ragotzy
2021-09-18 16:52:43 -04:00
committed by Devin Ragotzy
parent 02f2b31e61
commit 2a042d6105
16 changed files with 435 additions and 99 deletions
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10
compiler/rustc_middle/src/ty/mod.rs
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@@ -38,7 +38,7 @@ use rustc_macros::HashStable;
use rustc_query_system::ich::StableHashingContext;
use rustc_session::cstore::CrateStoreDyn;
use rustc_span::symbol::{kw, Ident, Symbol};
use rustc_span::Span;
use rustc_span::{sym, Span};
use rustc_target::abi::Align;
use std::cmp::Ordering;
@@ -1900,6 +1900,14 @@ impl<'tcx> TyCtxt<'tcx> {
self.sess.contains_name(&self.get_attrs(did), attr)
}
/// Determines whether an item is annotated with `doc(hidden)`.
pub fn is_doc_hidden(self, did: DefId) -> bool {
self.get_attrs(did)
.iter()
.filter_map(|attr| if attr.has_name(sym::doc) { attr.meta_item_list() } else { None })
.any(|items| items.iter().any(|item| item.has_name(sym::hidden)))
}
/// Returns `true` if this is an `auto trait`.
pub fn trait_is_auto(self, trait_def_id: DefId) -> bool {
self.trait_def(trait_def_id).has_auto_impl