[antlr-interest] C# target: String Templates and translation bug?

[ToolUsr]

Hello,
    Taking an illustrative example from Language Implementation Patterns page 336 (Cymbol translation)

tree grammar Gen; options {

  tokenVocab = Cymbol;
  ASTLabelType = CommonTree;
  output = template;
}



Here we are walking a tree (ASTLabelType) and outputting a template (output=template). Going down a little further


compilationUnit
    :   ( d+=classDeclaration | d+=methodDeclaration | d+=varDeclaration )+
        -> file(defs={$d})
    ;

 The 'd' variable accumulates the goodies for output to a template. In C# with an equivalent example I get the following code generated ...




List<CommonTree> list_d = null;
...
if (list_d==null) list_d=new List<StringTemplate>();

which is a compilation error as new List<StringTemplate>() doesn't cast to List<CommonTree>. 



Seems like a bug, thoughts? I'm using the latest version of the tools.