typeMapper.mapType(type, mode, signatureWriter)

        val canonicalSignature = signatureWriter.toString()
        require(!canonicalSignature.contains(SpecialNames.ANONYMOUS_STRING))

        if (canonicalSignature.contains("L<error>")) return null
        if (canonicalSignature.contains(SpecialNames.NO_NAME_PROVIDED.asString())) return null

        val signature = StringCharacterIterator(canonicalSignature)