diff options
| -rw-r--r-- | src/librustdoc/clean/utils.rs | 32 |
1 files changed, 16 insertions, 16 deletions
diff --git a/src/librustdoc/clean/utils.rs b/src/librustdoc/clean/utils.rs index 4f8db980ad4..47597e0413a 100644 --- a/src/librustdoc/clean/utils.rs +++ b/src/librustdoc/clean/utils.rs @@ -80,23 +80,23 @@ pub(crate) fn substs_to_args( substs: &[ty::subst::GenericArg<'_>], mut skip_first: bool, ) -> Vec<GenericArg> { - substs - .iter() - .filter_map(|kind| match kind.unpack() { - GenericArgKind::Lifetime(lt) => match *lt { - ty::ReLateBound(_, ty::BoundRegion { kind: ty::BrAnon(_), .. }) => { - Some(GenericArg::Lifetime(Lifetime::elided())) - } - _ => lt.clean(cx).map(GenericArg::Lifetime), - }, - GenericArgKind::Type(_) if skip_first => { - skip_first = false; - None + let mut ret_val = + Vec::with_capacity(substs.len().saturating_sub(if skip_first { 1 } else { 0 })); + ret_val.extend(substs.iter().filter_map(|kind| match kind.unpack() { + GenericArgKind::Lifetime(lt) => match *lt { + ty::ReLateBound(_, ty::BoundRegion { kind: ty::BrAnon(_), .. }) => { + Some(GenericArg::Lifetime(Lifetime::elided())) } - GenericArgKind::Type(ty) => Some(GenericArg::Type(ty.clean(cx))), - GenericArgKind::Const(ct) => Some(GenericArg::Const(Box::new(ct.clean(cx)))), - }) - .collect() + _ => lt.clean(cx).map(GenericArg::Lifetime), + }, + GenericArgKind::Type(_) if skip_first => { + skip_first = false; + None + } + GenericArgKind::Type(ty) => Some(GenericArg::Type(ty.clean(cx))), + GenericArgKind::Const(ct) => Some(GenericArg::Const(Box::new(ct.clean(cx)))), + })); + ret_val } fn external_generic_args( |