ASN.1 Information Objects parsing error
## Summary
The ASN.1 compiler doesn't support the _complex_ information objects like
```
Pdu ::= SEQUENCE {
id EXT-TYPE.&extId({Variants}),
content SEQUENCE OF EXT-TYPE.&ExtContent({Variants}{@.id})
}
```
## Steps and/or TTCN-3 code to reproduce
```
ttcn3_compiler -A test.asn
```
### test.asn:
```
ModuleTestEmpty DEFINITIONS AUTOMATIC TAGS ::= BEGIN
IMPORTS ;
Pdu ::= SEQUENCE {
id EXT-TYPE.&extId({Variants}),
content SEQUENCE OF EXT-TYPE.&ExtContent({Variants}{@.id})
}
EXT-TYPE ::= CLASS {
&extId VarId,
&ExtContent
} WITH SYNTAX {&ExtContent IDENTIFIED BY &extId}
Variants EXT-TYPE ::= {
{NULL IDENTIFIED BY v1},
...
}
VarId ::= INTEGER(0..255)
END
```
[test.asn](/uploads/79f1a9276672df941b8f4481b9fb7cd5/test.asn)
## What is the current bug behavior?
```
ttcn3_compiler.exe -A test.asn
Notify: Parsing ASN.1 module `test.asn'...
Notify: Checking modules...
test.asn: In ASN.1 module `ModuleTestEmpty':
test.asn:5: In type assignment `Pdu':
test.asn:7: In constraint #1 of type `open type':
test.asn:7: error: Type `@ModuleTestEmpty.Pdu.content' is not a SEQUENCE, SET of CHOICE type.
Notify: Error found in the input module. Code will not be generated.
```
## What is the expected correct behavior?
Code should be generated
## Relevant logs and/or screenshots
See above
## Titan version
```
TTCN-3 and ASN.1 Compiler for the TTCN-3 Test Executor
Version: 8.3.0
Build date: Jan 26 2023 09:02:42
Compiled with: GCC 11.3.0
Using OpenSSL 1.1.1s 1 Nov 2022
Commit id: a4679583a
```
## Platform details (OS type and version)
Windows 10+Cygwin)
/cc @aknappqwt @mmagyari
issue