THRIFT-564. Support arbitrary annotations on struct fields

This is subtly different from a type annotation, since some bits of
metadata only make sense in the context of a single structure field,
like whether the field is required, or whether the C++ code should use
a pointer for it.

This change doesn't define any meaningful annotations.  It just sets up
the parsing infrastructure.

I have no idea if $10 will work with older versions of yacc.  It seems
to work fine with bison.

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@919325 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/compiler/cpp/src/thrifty.yy b/compiler/cpp/src/thrifty.yy
index 0fc90da..f0745d7 100644
--- a/compiler/cpp/src/thrifty.yy
+++ b/compiler/cpp/src/thrifty.yy
@@ -853,7 +853,7 @@
     }
 
 Field:
-  CaptureDocText FieldIdentifier FieldRequiredness FieldType tok_identifier FieldValue XsdOptional XsdNillable XsdAttributes CommaOrSemicolonOptional
+  CaptureDocText FieldIdentifier FieldRequiredness FieldType tok_identifier FieldValue XsdOptional XsdNillable XsdAttributes TypeAnnotations CommaOrSemicolonOptional
     {
       pdebug("tok_int_constant : Field -> FieldType tok_identifier");
       if ($2 < 0) {
@@ -878,6 +878,10 @@
       if ($9 != NULL) {
         $$->set_xsd_attrs($9);
       }
+      if ($10 != NULL) {
+        $$->annotations_ = $10->annotations_;
+        delete $10;
+      }
     }
 
 FieldIdentifier: