def decorator_handle(tokens):
    """Process decorators."""
    defs = []
    decorates = []
    for i, tok in enumerate(tokens):
        if "simple" in tok and len(tok) == 1:
            decorates.append("@" + tok[0])
        elif "test" in tok and len(tok) == 1:
            varname = decorator_var + "_" + str(i)
            defs.append(varname + " = " + tok[0])
            decorates.append("@" + varname)
        else:
            raise CoconutInternalException("invalid decorator tokens", tok)
    return "\n".join(defs + decorates) + "\n"
Process decorators.