use proc_macro2::{Ident, TokenStream}; use quote::format_ident; use syn; use try; pub fn wrap_in_const( serde_path: Option<&syn::Path>, trait_: &str, ty: &Ident, code: TokenStream, ) -> TokenStream { let try_replacement = try::replacement(); let dummy_const = if cfg!(no_underscore_consts) { format_ident!("_IMPL_{}_FOR_{}", trait_, unraw(ty)) } else { format_ident!("_") }; let use_serde = match serde_path { Some(path) => quote! { use #path as _serde; }, None => quote! { #[allow(unused_extern_crates, clippy::useless_attribute)] extern crate serde as _serde; }, }; quote! { #[doc(hidden)] #[allow(non_upper_case_globals, unused_attributes, unused_qualifications)] const #dummy_const: () = { #use_serde #try_replacement #code }; } } #[allow(deprecated)] fn unraw(ident: &Ident) -> String { // str::trim_start_matches was added in 1.30, trim_left_matches deprecated // in 1.33. We currently support rustc back to 1.15 so we need to continue // to use the deprecated one. ident.to_string().trim_left_matches("r#").to_owned() }