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Handle visitor that does not need to be mutable

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This commit is contained in:
David Tolnay 2017-01-13 00:06:50 -08:00
parent 88debb3fb8
commit 800442a75e
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GPG Key ID: F9BA143B95FF6D82
1 changed files with 16 additions and 2 deletions
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18
serde_codegen/src/de.rs
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@ -274,6 +274,13 @@ fn deserialize_tuple(
quote!(deserializer.deserialize_tuple_struct(#type_name, #nfields, #visitor_expr))
};
let all_skipped = fields.iter().all(|field| field.attrs.skip_deserializing());
let visitor_var = if all_skipped {
quote!(_)
} else {
quote!(mut visitor)
};
quote!({
#visitor_item
@ -283,7 +290,7 @@ fn deserialize_tuple(
#visit_newtype_struct
#[inline]
fn visit_seq<__V>(&mut self, mut visitor: __V) -> ::std::result::Result<#ty, __V::Error>
fn visit_seq<__V>(&mut self, #visitor_var: __V) -> ::std::result::Result<#ty, __V::Error>
where __V: _serde::de::SeqVisitor
{
#visit_seq
@ -435,6 +442,13 @@ fn deserialize_struct(
}
};
let all_skipped = fields.iter().all(|field| field.attrs.skip_deserializing());
let visitor_var = if all_skipped {
quote!(_)
} else {
quote!(mut visitor)
};
quote!({
#field_visitor
@ -444,7 +458,7 @@ fn deserialize_struct(
type Value = #ty;
#[inline]
fn visit_seq<__V>(&mut self, mut visitor: __V) -> ::std::result::Result<#ty, __V::Error>
fn visit_seq<__V>(&mut self, #visitor_var: __V) -> ::std::result::Result<#ty, __V::Error>
where __V: _serde::de::SeqVisitor
{
#visit_seq