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Use iter::repeat to build phantom exprs

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This commit is contained in:
David Tolnay
2016-09-28 08:57:53 -07:00
parent 3a3777a2fb
commit 9fe16767c5
1 changed files with 3 additions and 1 deletions
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serde_codegen/src/de.rs
+3 -1
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@@ -5,6 +5,8 @@ use bound;
use internals::ast::{Body, Field, Item, Style, Variant}; use internals::ast::{Body, Field, Item, Style, Variant};
use internals::{self, attr}; use internals::{self, attr};
use std::iter;
pub fn expand_derive_deserialize(item: &syn::MacroInput) -> Result<Tokens, String> { pub fn expand_derive_deserialize(item: &syn::MacroInput) -> Result<Tokens, String> {
let item = { let item = {
let ctxt = internals::Ctxt::new(); let ctxt = internals::Ctxt::new();
@@ -186,7 +188,7 @@ fn deserialize_visitor(generics: &syn::Generics) -> (Tokens, Tokens, Tokens) {
Some(quote!(::<#(ty_param_idents),*>)) Some(quote!(::<#(ty_param_idents),*>))
}; };
let phantom_exprs = (0 .. num_phantoms).map(|_| quote!(::std::marker::PhantomData)); let phantom_exprs = iter::repeat(quote!(::std::marker::PhantomData)).take(num_phantoms);
( (
quote! { quote! {