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use syn::{AngleBracketedGenericArguments, ConstParam, GenericArgument, GenericParam, Generics, TypeParam};
use syn::parse_quote;
use syn::punctuated::Punctuated;
use syn::Token;
use syn::spanned::Spanned;

pub(crate) fn generic_params_to_args(generics: Generics) -> AngleBracketedGenericArguments {
    let args: Punctuated<GenericArgument, Token![,]> = generics.params.iter().map(|g| {
        match g {
            GenericParam::Type(TypeParam { ident, .. }) => GenericArgument::Type(parse_quote! { #ident }),
            GenericParam::Lifetime(l) => GenericArgument::Lifetime(l.lifetime.clone()),
            GenericParam::Const(ConstParam { ident, .. }) => {
                GenericArgument::Const(parse_quote! { #ident })
            }
        }
    }).collect();

    AngleBracketedGenericArguments {
        colon2_token: None,
        lt_token: generics.lt_token.unwrap_or_else(|| Token![<](generics.span())),
        args,
        gt_token: generics.gt_token.unwrap_or_else(|| Token![>](generics.span()))
    }
}