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Fix the lifetime generation problem of subscription. #309

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This commit is contained in:
Sunli 2020-10-12 15:04:46 +08:00
parent 25af42ed81
commit 31de709ca3
1 changed files with 9 additions and 2 deletions
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11
derive/src/subscription.rs
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@ -11,7 +11,8 @@ use proc_macro::TokenStream;
use quote::quote;
use syn::ext::IdentExt;
use syn::{
Block, Error, FnArg, ImplItem, ItemImpl, Pat, ReturnType, Type, TypeImplTrait, TypeReference,
Block, Error, FnArg, ImplItem, ItemImpl, Pat, ReturnType, Type, TypeImplTrait, TypeParamBound,
TypeReference,
};
pub fn generate(
@ -207,7 +208,13 @@ pub fn generate(
let res_ty = ty.value_type();
let stream_ty = if let Type::ImplTrait(TypeImplTrait { bounds, .. }) = &res_ty {
quote! { #bounds }
let mut r = None;
for b in bounds {
if let TypeParamBound::Trait(b) = b {
r = Some(quote! { #b });
}
}
quote! { #r }
} else {
quote! { #res_ty }
};