[antlr-interest] [bug?] AST rewrite rule with no (imaginary) token yields C runtime compile error

[David Benn]

I have this production:

predefined_type_def
                  : primitive_type -> ^(PREDEF_TYPE primitive_type)
                  | IDENT IDENT -> ^(PREDEF_TYPE IDENT IDENT)
                  ;

that works fine. An earlier version looked like this:

predefined_type_def
                  : primitive_type -> ^(primitive_type)
                  | IDENT IDENT -> ^(IDENT IDENT)
                  ;

i.e. it had no imaginary root node in the AST rewrite rule.

When compiling the resulting Parser for grammar X for the C runtime, I get:

- g++ -g  -I/work/astc-internal/antlr3/include -c XLexer.c    XParser.c
XParser.c: In function `XParser_struct_field_def_return 
struct_field_def(XParser_Ctx_struct*)':
XParser.c:2112: error: `stream_XParser' was not declared in this scope

Assuming the rewrite rule is legal (but perhaps not desirable), I guess 
this is a bug in the C runtime code generation step.

Rgds,

DJB

-- 
David Benn
Australian Semiconductor Technology Company (ASTC) Pty Ltd
76 Waymouth Street
Adelaide 5000, South Australia
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Email: david.benn at astc-design.com
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