Apply updated matches! formatting to rustfmt

Since rustfmt uses version two formatting the self tests were failing
due to the new special case handling for `matches!`. various `matches!`
calls in the codebase were updated to address this issue.

src/expr.rs

@@ -1882,9 +1882,9 @@ impl<'ast> RhsAssignKind<'ast> {
                 matches!(
                     kind,
                     ast::ExprKind::Try(..)
-                        | ast::ExprKind::Field(..)
-                        | ast::ExprKind::MethodCall(..)
-                        | ast::ExprKind::Await(_)
+                    | ast::ExprKind::Field(..)
+                    | ast::ExprKind::MethodCall(..)
+                    | ast::ExprKind::Await(_)
                 )
             }
             _ => false,

src/items.rs

@@ -3324,10 +3324,7 @@ pub(crate) fn rewrite_extern_crate(
 
 /// Returns `true` for `mod foo;`, false for `mod foo { .. }`.
 pub(crate) fn is_mod_decl(item: &ast::Item) -> bool {
-    !matches!(
-        item.kind,
-        ast::ItemKind::Mod(_, ast::ModKind::Loaded(_, ast::Inline::Yes, _))
-    )
+    !matches!(item.kind, ast::ItemKind::Mod(_, ast::ModKind::Loaded(_, ast::Inline::Yes, _)))
 }
 
 pub(crate) fn is_use_item(item: &ast::Item) -> bool {

src/macros.rs

@@ -591,15 +591,12 @@ impl MacroArgKind {
         matches!(
             *self,
             MacroArgKind::Repeat(Delimiter::Brace, _, _, _)
-                | MacroArgKind::Delimited(Delimiter::Brace, _)
+            | MacroArgKind::Delimited(Delimiter::Brace, _)
         )
     }
 
     fn starts_with_dollar(&self) -> bool {
-        matches!(
-            *self,
-            MacroArgKind::Repeat(..) | MacroArgKind::MetaVariable(..)
-        )
+        matches!(*self, MacroArgKind::Repeat(..) | MacroArgKind::MetaVariable(..))
     }
 
     fn ends_with_space(&self) -> bool {
@@ -1052,10 +1049,7 @@ fn force_space_before(tok: &TokenKind) -> bool {
 }
 
 fn ident_like(tok: &Token) -> bool {
-    matches!(
-        tok.kind,
-        TokenKind::Ident(..) | TokenKind::Literal(..) | TokenKind::Lifetime(_)
-    )
+    matches!(tok.kind, TokenKind::Ident(..) | TokenKind::Literal(..) | TokenKind::Lifetime(_))
 }
 
 fn next_space(tok: &TokenKind) -> SpaceState {

src/overflow.rs

@@ -141,8 +141,8 @@ impl<'a> OverflowableItem<'a> {
         matches!(
             self,
             OverflowableItem::Expr(..)
-                | OverflowableItem::MacroArg(MacroArg::Expr(..))
-                | OverflowableItem::MatchesMacroItem(MatchesMacroItem::Expr(..))
+            | OverflowableItem::MacroArg(MacroArg::Expr(..))
+            | OverflowableItem::MatchesMacroItem(MatchesMacroItem::Expr(..))
         )
     }