[Bug]: Crashes with NPE when cyclic record field references

[gabilang]

Description

$title

Steps to Reproduce

type Person record {|
    string name;
    int age?;
    Student ...;
|};

type Student record {|
    *Person;
    int studentId;
    string code?;
|};

Output:

[2024-04-10 10:46:44,542] SEVERE {b7a.log.crash} - Cannot read field "scope" because "env" is null 
java.lang.NullPointerException: Cannot read field "scope" because "env" is null
        at org.wso2.ballerinalang.compiler.semantics.analyzer.SymbolResolver.transform(SymbolResolver.java:1603)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.SymbolResolver.transform(SymbolResolver.java:149)
        at org.wso2.ballerinalang.compiler.tree.types.BLangUserDefinedType.apply(BLangUserDefinedType.java:87)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.SymbolResolver.resolveTypeNode(SymbolResolver.java:541)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.SymbolResolver.resolveTypeNode(SymbolResolver.java:520)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.SymbolEnter.resolveRestField(SymbolEnter.java:3939)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.SymbolEnter.resolveRestField(SymbolEnter.java:3954)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.SymbolEnter.defineReferencedFieldsOfRecordTypeDef(SymbolEnter.java:3918)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.TypeResolver.defineFields(TypeResolver.java:293)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.TypeResolver.resolveTypeDesc(TypeResolver.java:1074)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.TypeResolver.resolveTypeDesc(TypeResolver.java:711)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.TypeResolver.resolveTypeDefinition(TypeResolver.java:543)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.TypeResolver.resolveTypeDesc(TypeResolver.java:1624)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.TypeResolver.resolveTypeDesc(TypeResolver.java:729)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.TypeResolver.resolveTypeDesc(TypeResolver.java:684)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.TypeResolver.resolveTypeDesc(TypeResolver.java:1054)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.TypeResolver.resolveTypeDesc(TypeResolver.java:711)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.TypeResolver.resolveTypeDefinition(TypeResolver.java:543)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.TypeResolver.defineBTypes(TypeResolver.java:235)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.SymbolEnter.defineConstructs(SymbolEnter.java:430)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.SymbolEnter.visit(SymbolEnter.java:357)
        at org.wso2.ballerinalang.compiler.tree.BLangPackage.accept(BLangPackage.java:167)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.SymbolEnter.defineNode(SymbolEnter.java:313)
        at org.wso2.ballerinalang.compiler.semantics.analyzer.SymbolEnter.definePackage(SymbolEnter.java:289)
        at io.ballerina.projects.ModuleContext.compileInternal(ModuleContext.java:433)
        at io.ballerina.projects.ModuleCompilationState$1.compile(ModuleCompilationState.java:45)
        at io.ballerina.projects.ModuleContext.compile(ModuleContext.java:383)
        at io.ballerina.projects.PackageCompilation.compileModulesInternal(PackageCompilation.java:208)
        at io.ballerina.projects.PackageCompilation.compileModules(PackageCompilation.java:192)
        at io.ballerina.projects.PackageCompilation.compile(PackageCompilation.java:99)
        at io.ballerina.projects.PackageCompilation.from(PackageCompilation.java:94)
        at io.ballerina.projects.PackageContext.getPackageCompilation(PackageContext.java:242)
        at io.ballerina.projects.Package.getCompilation(Package.java:150)
        at io.ballerina.projects.Package.runCodeGeneratorPlugins(Package.java:319)
        at io.ballerina.cli.task.CompileTask.execute(CompileTask.java:142)
        at io.ballerina.cli.TaskExecutor.executeTasks(TaskExecutor.java:40)
        at io.ballerina.cli.cmd.BuildCommand.execute(BuildCommand.java:288)
        at java.base/java.util.Optional.ifPresent(Optional.java:178)
        at io.ballerina.cli.launcher.Main.main(Main.java:58)

Affected Version(s)

2201.8.x

OS, DB, other environment details and versions

No response

Related area

-> Compilation

Related issue(s) (optional)

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Suggested label(s) (optional)

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Suggested assignee(s) (optional)

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