Auto merge of #60669 - c410-f3r:attrs-fn, r=petrochenkov

Allow attributes in formal function parameters

Implements https://github.com/rust-lang/rust/issues/60406.

This is my first contribution to the compiler and since this is a large and complex project, I am not fully aware of the consequences of the changes I have made.

**TODO**

- [x] Forbid some built-in attributes.
- [x] Expand cfg/cfg_attr

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libsyntax_ext/deriving/generic/mod.rs b/src/libsyntax_ext/deriving/generic/mod.rs
index ffec667aba5..8b719b5477c 100644
--- a/src/libsyntax_ext/deriving/generic/mod.rs
+++ b/src/libsyntax_ext/deriving/generic/mod.rs
@@ -928,7 +928,7 @@ impl<'a> MethodDef<'a> {
         let args = {
             let self_args = explicit_self.map(|explicit_self| {
                 let ident = Ident::with_empty_ctxt(kw::SelfLower).with_span_pos(trait_.span);
-                ast::Arg::from_self(explicit_self, ident)
+                ast::Arg::from_self(ThinVec::default(), explicit_self, ident)
             });
             let nonself_args = arg_types.into_iter()
                 .map(|(name, ty)| cx.arg(trait_.span, name, ty));