Rollup merge of #66188 - Centril:fnsig, r=davidtwco

`MethodSig` -> `FnSig` & Use it in `ItemKind::Fn`

In both AST & HIR, rename `MethodSig` to `FnSig` and then proceed to use it in `ItemKind::Fn` so that the overall structure is more regular.

r? @davidtwco

1 files changed, 4 insertions, 4 deletions

diff --git a/src/libsyntax/parse/parser/item.rs b/src/libsyntax/parse/parser/item.rs
index 3c618d75d34..531ad532a54 100644
--- a/src/libsyntax/parse/parser/item.rs
+++ b/src/libsyntax/parse/parser/item.rs
@@ -8,7 +8,7 @@ use crate::ast::{ItemKind, ImplItem, ImplItemKind, TraitItem, TraitItemKind, Use
 use crate::ast::{PathSegment, IsAuto, Constness, IsAsync, Unsafety, Defaultness};
 use crate::ast::{Visibility, VisibilityKind, Mutability, FnHeader, ForeignItem, ForeignItemKind};
 use crate::ast::{Ty, TyKind, Generics, GenericBounds, TraitRef, EnumDef, VariantData, StructField};
-use crate::ast::{Mac, MacDelimiter, Block, BindingMode, FnDecl, MethodSig, SelfKind, Param};
+use crate::ast::{Mac, MacDelimiter, Block, BindingMode, FnDecl, FnSig, SelfKind, Param};
 use crate::parse::token;
 use crate::tokenstream::{TokenTree, TokenStream};
 use crate::symbol::{kw, sym};
@@ -1800,7 +1800,7 @@ impl<'a> Parser<'a> {
             is_name_required: |_| true,
         })?;
         let (inner_attrs, body) = self.parse_inner_attrs_and_block()?;
-        let kind = ItemKind::Fn(decl, header, generics, body);
+        let kind = ItemKind::Fn(FnSig { decl, header }, generics, body);
         self.mk_item_with_info(attrs, lo, vis, (ident, kind, Some(inner_attrs)))
     }
 
@@ -1897,14 +1897,14 @@ impl<'a> Parser<'a> {
     fn parse_method_sig(
         &mut self,
         is_name_required: fn(&token::Token) -> bool,
-    ) -> PResult<'a, (Ident, MethodSig, Generics)> {
+    ) -> PResult<'a, (Ident, FnSig, Generics)> {
         let header = self.parse_fn_front_matter()?;
         let (ident, decl, generics) = self.parse_fn_sig(ParamCfg {
             is_self_allowed: true,
             allow_c_variadic: false,
             is_name_required,
         })?;
-        Ok((ident, MethodSig { header, decl }, generics))
+        Ok((ident, FnSig { header, decl }, generics))
     }
 
     /// Parses all the "front matter" for a `fn` declaration, up to