Write annotations of constant, global, and class/module alias declarations

lib/rbs/writer.rb

@@ -159,10 +159,12 @@ def write_decl(decl)
         puts "end"
       when AST::Declarations::Constant
         write_comment decl.comment
+        write_annotation decl.annotations
         puts "#{decl.name}: #{decl.type}"
 
       when AST::Declarations::Global
         write_comment decl.comment
+        write_annotation decl.annotations
         puts "#{decl.name}: #{decl.type}"
 
       when AST::Declarations::TypeAlias
@@ -174,12 +176,14 @@ def write_decl(decl)
 
       when AST::Declarations::ClassAlias
         write_comment decl.comment
+        write_annotation decl.annotations
         write_loc_source(decl) {
           puts "class #{decl.new_name} = #{decl.old_name}"
         }
 
       when AST::Declarations::ModuleAlias
         write_comment decl.comment
+        write_annotation decl.annotations
         write_loc_source(decl) {
           puts "module #{decl.new_name} = #{decl.old_name}"
         }

test/rbs/writer_test.rb

@@ -41,6 +41,37 @@ module C = D
     SIG
   end
 
+  def test_annotated_decl
+    assert_writer <<-SIG
+%a{deprecated}
+FOO: Integer
+
+%a{deprecated}
+$foo: Integer
+
+# Alias of B.
+%a{deprecated}
+class A = B
+
+# Alias of D.
+%a{deprecated}
+module C = D
+
+module Foo
+  %a{deprecated}
+  FOO: Integer
+
+  # Alias of B.
+  %a{deprecated}
+  class A = B
+
+  # Alias of D.
+  %a{deprecated}
+  module C = D
+end
+    SIG
+  end
+
   def test_class_decl
     assert_writer <<-SIG
 class Foo::Bar[X] < Array[String]