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rustdoc: clean QPath::LangItem

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This commit adds support for cleaning `QPath::LangItem` and
`hir::GenericBound::LangItemTrait` in rustdoc. `QPath::LangItem`
does not require lowering, and `hir::GenericBound::LangItemTrait`
is lowered to a `GenericBound::TraitBound`.

Signed-off-by: David Wood <david@davidtw.co>
This commit is contained in:
David Wood 2020-08-04 14:22:16 +01:00
parent 8367af469b
commit dde93c9ba6
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GPG key ID: 2592E76C87381FD9
2 changed files with 21 additions and 0 deletions
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20
src/librustdoc/clean/mod.rs
View file

@ -17,6 +17,7 @@ use rustc_hir::def::{CtorKind, DefKind, Res};
use rustc_hir::def_id::{CrateNum, DefId, CRATE_DEF_INDEX};
use rustc_index::vec::{Idx, IndexVec};
use rustc_infer::infer::region_constraints::{Constraint, RegionConstraintData};
use rustc_middle::bug;
use rustc_middle::middle::resolve_lifetime as rl;
use rustc_middle::middle::stability;
use rustc_middle::ty::fold::TypeFolder;
@ -291,6 +292,22 @@ impl Clean<GenericBound> for hir::GenericBound<'_> {
fn clean(&self, cx: &DocContext<'_>) -> GenericBound {
match *self {
hir::GenericBound::Outlives(lt) => GenericBound::Outlives(lt.clean(cx)),
hir::GenericBound::LangItemTrait(lang_item, span, _, generic_args) => {
let def_id = cx.tcx.require_lang_item(lang_item, Some(span));
let trait_ref = ty::TraitRef::identity(cx.tcx, def_id);
let generic_args = generic_args.clean(cx);
let bindings = match generic_args {
GenericArgs::AngleBracketed { bindings, .. } => bindings,
_ => bug!("clean: parenthesized `GenericBound::LangItemTrait`"),
};
GenericBound::TraitBound(
PolyTrait { trait_: (trait_ref, &*bindings).clean(cx), generic_params: vec![] },
hir::TraitBoundModifier::None,
)
}
hir::GenericBound::Trait(ref t, modifier) => {
GenericBound::TraitBound(t.clean(cx), modifier)
}
@ -1504,6 +1521,9 @@ impl Clean<Type> for hir::Ty<'_> {
trait_: box resolve_type(cx, trait_path.clean(cx), self.hir_id),
}
}
TyKind::Path(hir::QPath::LangItem(..)) => {
bug!("clean: requiring documentation of lang item")
}
TyKind::TraitObject(ref bounds, ref lifetime) => {
match bounds[0].clean(cx).trait_ {
ResolvedPath { path, param_names: None, did, is_generic } => {

1
src/librustdoc/clean/utils.rs
View file

@ -335,6 +335,7 @@ pub fn qpath_to_string(p: &hir::QPath<'_>) -> String {
let segments = match *p {
hir::QPath::Resolved(_, ref path) => &path.segments,
hir::QPath::TypeRelative(_, ref segment) => return segment.ident.to_string(),
hir::QPath::LangItem(lang_item, ..) => return lang_item.name().to_string(),
};
let mut s = String::new();