RFC 4506, "XDR: External Data Representation Standard", May 2006

Errata ID: 6382
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Ed Schouten
Date Reported: 2021-01-08

Section 6.3 says:

      declaration:
           type-specifier identifier
         | type-specifier identifier "[" value "]"
         | type-specifier identifier "<" [ value ] ">"
         | "opaque" identifier "[" value "]"
         | "opaque" identifier "<" [ value ] ">"
         | "string" identifier "<" [ value ] ">"
         | type-specifier "*" identifier
         | "void"

[...]

      struct-body:
         "{"
            ( declaration ";" )
            ( declaration ";" )*
         "}"

[...]

      type-def:
           "typedef" declaration ";"
         | "enum" identifier enum-body ";"
         | "struct" identifier struct-body ";"
         | "union" identifier union-body ";"

It should say:

None

Notes:

This grammar permits statements like:

typedef void;
struct foo { void; };

rpcgen doesn't allow this, failing with the following error message:

voids allowed only inside union and program definitions with one argument

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