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Remove unnecessary unwraps #60720

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merged 1 commit into from
May 12, 2019
Merged

Remove unnecessary unwraps #60720

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57 changes: 34 additions & 23 deletions src/librustc_typeck/check/method/suggest.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -91,14 +91,21 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
CandidateSource::ImplSource(impl_did) => {
// Provide the best span we can. Use the item, if local to crate, else
// the impl, if local to crate (item may be defaulted), else nothing.
let item = self.associated_item(impl_did, item_name, Namespace::Value)
.or_else(|| {
self.associated_item(
self.tcx.impl_trait_ref(impl_did).unwrap().def_id,
item_name,
Namespace::Value,
)
}).unwrap();
let item = match self.associated_item(
impl_did,
item_name,
Namespace::Value,
).or_else(|| {
let impl_trait_ref = self.tcx.impl_trait_ref(impl_did)?;
self.associated_item(
impl_trait_ref.def_id,
item_name,
Namespace::Value,
)
}) {
Some(item) => item,
None => continue,
};
let note_span = self.tcx.hir().span_if_local(item.def_id).or_else(|| {
self.tcx.hir().span_if_local(impl_did)
});
Expand Down Expand Up @@ -132,9 +139,14 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
}
}
CandidateSource::TraitSource(trait_did) => {
let item = self
.associated_item(trait_did, item_name, Namespace::Value)
.unwrap();
let item = match self.associated_item(
trait_did,
item_name,
Namespace::Value)
{
Some(item) => item,
None => continue,
};
let item_span = self.tcx.sess.source_map()
.def_span(self.tcx.def_span(item.def_id));
if sources.len() > 1 {
Expand Down Expand Up @@ -251,8 +263,7 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
if let &QPath::Resolved(_, ref path) = &qpath {
if let hir::def::Res::Local(hir_id) = path.res {
let span = tcx.hir().span_by_hir_id(hir_id);
let snippet = tcx.sess.source_map().span_to_snippet(span)
.unwrap();
let snippet = tcx.sess.source_map().span_to_snippet(span);
let filename = tcx.sess.source_map().span_to_filename(span);

let parent_node = self.tcx.hir().get_by_hir_id(
Expand All @@ -263,12 +274,12 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
concrete_type,
);

match (filename, parent_node) {
match (filename, parent_node, snippet) {
(FileName::Real(_), Node::Local(hir::Local {
source: hir::LocalSource::Normal,
ty,
..
})) => {
}), Ok(ref snippet)) => {
err.span_suggestion(
// account for `let x: _ = 42;`
// ^^^^
Expand Down Expand Up @@ -375,14 +386,14 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
self.tcx.hir().get_parent_node_by_hir_id(expr.hir_id),
);

let span = call_expr.span.trim_start(item_name.span).unwrap();

err.span_suggestion(
span,
"remove the arguments",
String::new(),
Applicability::MaybeIncorrect,
);
if let Some(span) = call_expr.span.trim_start(item_name.span) {
err.span_suggestion(
span,
"remove the arguments",
String::new(),
Applicability::MaybeIncorrect,
);
}
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Only this change was needed, but avoiding the other unwraps is worthwhile.

}
}

Expand Down