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Also provide a smarter alternative for the other impossible case

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This commit is contained in:
David Tolnay
2017-01-11 11:34:47 -08:00
parent d2eea87001
commit b01c23b5ee
1 changed files with 4 additions and 1 deletions
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serde_codegen/src/de.rs
+4 -1
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@@ -533,6 +533,9 @@ fn deserialize_item_enum(
// This is an empty enum like `enum Impossible {}` or an enum in which // This is an empty enum like `enum Impossible {}` or an enum in which
// all variants have `#[serde(skip_deserializing)]`. // all variants have `#[serde(skip_deserializing)]`.
quote! { quote! {
// FIXME: Once we drop support for Rust 1.15:
// let Err(err) = visitor.visit_variant::<__Field>();
// Err(err)
visitor.visit_variant::<__Field>().map(|impossible| match impossible {}) visitor.visit_variant::<__Field>().map(|impossible| match impossible {})
} }
} else { } else {
@@ -749,7 +752,7 @@ fn deserialize_map(
) -> Tokens { ) -> Tokens {
if fields.is_empty() && item_attrs.deny_unknown_fields() { if fields.is_empty() && item_attrs.deny_unknown_fields() {
return quote! { return quote! {
// Once we drop support for Rust 1.15: // FIXME: Once we drop support for Rust 1.15:
// let None::<__Field> = try!(visitor.visit_key()); // let None::<__Field> = try!(visitor.visit_key());
try!(visitor.visit_key::<__Field>()).map(|impossible| match impossible {}); try!(visitor.visit_key::<__Field>()).map(|impossible| match impossible {});
try!(visitor.end()); try!(visitor.end());