EAccessViolation in IncRefCount (line 636 of symtype.pas) with generics and managed types

Summary

Access violation in compiler in IncRefCount (line 636 of symtype.pas) occurs when combining managed types, generics, and nested types referencing the parent type.

Steps to reproduce

This is the smallest repro I could come up with. Removing almost any component of this prevents the crash.

{$MODE OBJFPC}
{$MODESWITCH ADVANCEDRECORDS+}
program test;

type
   generic TManagedType <T> = record
      class operator Initialize(var Value: TManagedType);
      function Test(): T;
   end;

class operator TManagedType.Initialize(var Value: TManagedType);
begin
end;

function TManagedType.Test(): T;
begin
   Result := Default(T);
end;

type
   TRecord = record
      type
         TUnusedTypeDef = specialize TManagedType<TRecord>;
      var
         FManagedField: array of Integer; // any managed type
   end;

begin
end.

System Information

• Operating system: Linux
• Processor architecture: x86-64
• Compiler version: trunk compiled on 2026/01/30
• Device: Computer