code: Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
                                    Type site, Name name, List<Type> argtypes,
                                    List<Type> typeargtypes) {
          return resolveQualifiedMethod(pos, env, site.tsym, site, name, argtypes, typeargtypes);
      }
docs: Resolve a qualified method identifier
  @param pos       The position to use for error reporting.
  @param env       The environment current at the method invocation.
  @param site      The type of the qualifying expression, in which
  identifier is searched.
  @param name      The identifier's name.
  @param argtypes  The types of the invocation's value arguments.
  @param typeargtypes  The types of the invocation's type arguments.