OpenE2K/rust
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

rustc: don't mark lifetimes as early-bound in the presence of impl Trait.

Browse Source
This commit is contained in:
Eduard-Mihai Burtescu 2017-11-22 21:10:55 +02:00
parent 45594d5dec
commit fc658f2cfd
1 changed files with 0 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
src/librustc/middle/resolve_lifetime.rs
View File

@ -1675,7 +1675,6 @@ fn insert_late_bound_lifetimes(map: &mut NamedRegionMap,
let mut appears_in_output = AllCollector {
regions: FxHashSet(),
impl_trait: false
};
intravisit::walk_fn_ret_ty(&mut appears_in_output, &decl.output);
@ -1688,7 +1687,6 @@ fn insert_late_bound_lifetimes(map: &mut NamedRegionMap,
// ignore binders here and scrape up all names we see.
let mut appears_in_where_clause = AllCollector {
regions: FxHashSet(),
impl_trait: false
};
for ty_param in generics.ty_params.iter() {
walk_list!(&mut appears_in_where_clause,
@ -1729,9 +1727,6 @@ fn insert_late_bound_lifetimes(map: &mut NamedRegionMap,
// appears in the where clauses? early-bound.
if appears_in_where_clause.regions.contains(&name) { continue; }
// any `impl Trait` in the return type? early-bound.
if appears_in_output.impl_trait { continue; }
// does not appear in the inputs, but appears in the return type? early-bound.
if !constrained_by_input.regions.contains(&name) &&
appears_in_output.regions.contains(&name) {
@ -1790,7 +1785,6 @@ fn insert_late_bound_lifetimes(map: &mut NamedRegionMap,
struct AllCollector {
regions: FxHashSet<hir::LifetimeName>,
impl_trait: bool
}
impl<'v> Visitor<'v> for AllCollector {
@ -1801,12 +1795,5 @@ fn insert_late_bound_lifetimes(map: &mut NamedRegionMap,
fn visit_lifetime(&mut self, lifetime_ref: &'v hir::Lifetime) {
self.regions.insert(lifetime_ref.name);
}
fn visit_ty(&mut self, ty: &hir::Ty) {
if let hir::TyImplTraitExistential(..) = ty.node {
self.impl_trait = true;
}
intravisit::walk_ty(self, ty);
}
}
}