Revert "Split out macro calls in item position"

This reverts commit 723a57a.

Author: jonas-schievink

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "ungrammar"
 description = "A DSL for describing concrete syntax trees"
-version = "1.12.0"
+version = "1.11.0"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/matklad/ungrammar"
 authors = ["Aleksey Kladov <aleksey.kladov@gmail.com>"]

rust.ungram

@@ -90,7 +90,7 @@ Item =
 | ExternCrate
 | Fn
 | Impl
-| MacroItem
+| MacroCall
 | MacroRules
 | MacroDef
 | Module
@@ -101,9 +101,6 @@ Item =
 | Union
 | Use
 
-MacroItem =
-  MacroCall
-
 MacroRules =
   Attr* Visibility?
   'macro_rules' '!' Name