Merge commit '6eba9cd92c295c5389944f6adda1f1e83b2cb008' as 'subprojects/thiserror'

subprojects/thiserror/impl/src/lib.rs

@@ -0,0 +1,55 @@
+#![allow(
+    clippy::blocks_in_conditions,
+    clippy::cast_lossless,
+    clippy::cast_possible_truncation,
+    clippy::enum_glob_use,
+    clippy::expl_impl_clone_on_copy, // https://github.com/rust-lang/rust-clippy/issues/15842
+    clippy::manual_find,
+    clippy::manual_let_else,
+    clippy::manual_map,
+    clippy::map_unwrap_or,
+    clippy::module_name_repetitions,
+    clippy::needless_pass_by_value,
+    clippy::range_plus_one,
+    clippy::single_match_else,
+    clippy::struct_field_names,
+    clippy::too_many_lines,
+    clippy::wrong_self_convention
+)]
+#![allow(unknown_lints, mismatched_lifetime_syntaxes)]
+
+extern crate proc_macro;
+
+mod ast;
+mod attr;
+mod expand;
+mod fallback;
+mod fmt;
+mod generics;
+mod prop;
+mod scan_expr;
+mod unraw;
+mod valid;
+
+use proc_macro::TokenStream;
+use proc_macro2::{Ident, Span};
+use quote::{ToTokens, TokenStreamExt as _};
+use syn::{parse_macro_input, DeriveInput};
+
+#[proc_macro_derive(Error, attributes(backtrace, error, from, source))]
+pub fn derive_error(input: TokenStream) -> TokenStream {
+    let input = parse_macro_input!(input as DeriveInput);
+    expand::derive(&input).into()
+}
+
+#[allow(non_camel_case_types)]
+struct private;
+
+impl ToTokens for private {
+    fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
+        tokens.append(Ident::new(
+            concat!("__private", env!("CARGO_PKG_VERSION_PATCH")),
+            Span::call_site(),
+        ));
+    }
+}