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Preserve order of generic args

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hkalbasi 2021-12-29 17:05:59 +03:30
parent 9d473a0b9f
commit 4fa8749c44
39 changed files with 714 additions and 427 deletions
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11
crates/hir_expand/src/builtin_derive_macro.rs
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@ -71,7 +71,7 @@ pub fn find_builtin_derive(
struct BasicAdtInfo {
name: tt::Ident,
type_params: usize,
type_or_const_params: usize,
}
fn parse_adt(tt: &tt::Subtree) -> Result<BasicAdtInfo, ExpandError> {
@ -104,8 +104,9 @@ fn parse_adt(tt: &tt::Subtree) -> Result<BasicAdtInfo, ExpandError> {
.token_by_range(name.syntax().text_range())
.unwrap_or_else(|| TokenId::unspecified());
let name_token = tt::Ident { id: name_token_id, text: name.text().into() };
let type_params = params.map_or(0, |type_param_list| type_param_list.type_params().count());
Ok(BasicAdtInfo { name: name_token, type_params })
let type_or_const_params =
params.map_or(0, |type_param_list| type_param_list.type_or_const_params().count());
Ok(BasicAdtInfo { name: name_token, type_or_const_params })
}
fn make_type_args(n: usize, bound: Vec<tt::TokenTree>) -> Vec<tt::TokenTree> {
@ -157,8 +158,8 @@ fn expand_simple_derive(tt: &tt::Subtree, trait_path: tt::Subtree) -> ExpandResu
let name = info.name;
let trait_path_clone = trait_path.token_trees.clone();
let bound = (quote! { : ##trait_path_clone }).token_trees;
let type_params = make_type_args(info.type_params, bound);
let type_args = make_type_args(info.type_params, Vec::new());
let type_params = make_type_args(info.type_or_const_params, bound);
let type_args = make_type_args(info.type_or_const_params, Vec::new());
let trait_path = trait_path.token_trees;
let expanded = quote! {
impl ##type_params ##trait_path for #name ##type_args {}