Use maintained version of proc-macro-error.

Cargo.toml

@@ -15,8 +15,8 @@ rust-version = "1.58.0"
 [lib]
 proc-macro = true
 
-[dependencies.proc-macro-error]
-version = "1.0"
+[dependencies.proc-macro-error2]
+version = "2.0"
 default-features = false
 
 [dependencies.syn]

lib/Cargo.toml

@@ -15,8 +15,8 @@ rust-version = "1.58.0"
 quote = "1.0"
 proc-macro2 = "1.0"
 
-[dependencies.proc-macro-error]
-version = "1.0"
+[dependencies.proc-macro-error2]
+version = "2.0"
 default-features = false
 
 [dependencies.syn]

lib/src/anon.rs

@@ -291,7 +291,7 @@ impl ToTokens for AnonScope {
 
 mod parsing {
     use super::*;
-    use proc_macro_error::abort;
+    use proc_macro_error2::abort;
     use syn::parse::{Error, Parse, ParseStream, Result};
     use syn::{braced, parenthesized};
 

lib/src/autoimpl.rs

@@ -8,7 +8,7 @@
 use crate::generics::{clause_to_toks, WhereClause};
 use crate::SimplePath;
 use proc_macro2::{Span, TokenStream as Toks};
-use proc_macro_error::emit_error;
+use proc_macro_error2::emit_error;
 use quote::{quote, TokenStreamExt};
 use syn::spanned::Spanned;
 use syn::token::Comma;

lib/src/autoimpl/for_deref.rs

@@ -7,7 +7,7 @@
 
 use crate::generics::{GenericParam, Generics, TypeParamBound, WherePredicate};
 use proc_macro2::{Span, TokenStream};
-use proc_macro_error::{emit_call_site_error, emit_error};
+use proc_macro_error2::{emit_call_site_error, emit_error};
 use quote::{quote, ToTokens, TokenStreamExt};
 use syn::punctuated::Punctuated;
 use syn::spanned::Spanned;

lib/src/default.rs

@@ -8,7 +8,7 @@ use crate::generics::{clause_to_toks, WhereClause};
 use crate::scope::{Scope, ScopeAttr, ScopeItem};
 use crate::SimplePath;
 use proc_macro2::{Span, TokenStream};
-use proc_macro_error::emit_error;
+use proc_macro_error2::emit_error;
 use quote::quote;
 use syn::parse::{Error, Parse, ParseStream, Result};
 use syn::spanned::Spanned;

lib/src/fields.rs

@@ -6,7 +6,7 @@
 //! Custom version of [`syn`] fields types supporting initializers
 
 use proc_macro2::TokenStream;
-use proc_macro_error::emit_error;
+use proc_macro_error2::emit_error;
 use quote::{ToTokens, TokenStreamExt};
 use syn::parse::{Parse, ParseStream, Result};
 use syn::punctuated::Punctuated;

lib/src/scope.rs

@@ -7,7 +7,7 @@
 
 use crate::{fields::Fields, SimplePath};
 use proc_macro2::{Span, TokenStream};
-use proc_macro_error::emit_error;
+use proc_macro_error2::emit_error;
 use quote::{ToTokens, TokenStreamExt};
 use syn::punctuated::Punctuated;
 use syn::spanned::Spanned;

src/lib.rs

@@ -41,7 +41,7 @@ extern crate proc_macro;
 
 use lib::{anon, scope};
 use proc_macro::TokenStream;
-use proc_macro_error::{emit_call_site_error, proc_macro_error};
+use proc_macro_error2::{emit_call_site_error, proc_macro_error};
 use syn::parse_macro_input;
 
 use impl_tools_lib::{self as lib, autoimpl};