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Copy conditional compilation flags onto created constructors (#13)

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(Closes #12)
This commit is contained in:
nullstalgia
2025-09-02 04:43:29 -07:00
committed by GitHub
parent 6c014e41a6
commit 8a863f3b32
2 changed files with 28 additions and 0 deletions
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5
src/expand.rs
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@@ -14,6 +14,10 @@ pub(crate) fn expand_struct(mut item: ItemStruct) -> proc_macro::TokenStream {
let default: TokenStream = attr.parse_args().unwrap();
// copy all the same #[cfg] conditional compilations flags for the field onto our built "constructor"
// otherwise, it's possible to create a constructor for a type that may be filtered by the same #[cfg]'s, breaking compilation
let cfg_attrs = field.attrs.iter().filter(|a| a.path().is_ident("cfg"));
let fn_name_lit = format!("__serde_inline_default_{}_{}", item.ident, i);
let fn_name_ident = Ident::new(&fn_name_lit, Span::call_site());
let mut return_type = field.ty.clone();
@@ -24,6 +28,7 @@ pub(crate) fn expand_struct(mut item: ItemStruct) -> proc_macro::TokenStream {
inline_fns.push(quote! {
#[doc(hidden)]
#[allow(non_snake_case)]
#( #cfg_attrs )*
fn #fn_name_ident () -> #return_type {
#default
}