bug: explicit class(TObject) base "type not found"

• Type: bug (Track A — symbol resolution)
• Status: done
• Found: 2026-06-23, differential probe vs FPC
• Severity: low-medium (common FPC/Delphi spelling; blocks class(TObject, IFoo))

Symptom

Naming TObject explicitly as the base class fails, though an implicit base works:

type tc = class(TObject) procedure m; end;   { pxx: error: base type not found: TObject }
type tc = class procedure m; end;            { ok (implicit TObject base) }

Also blocks the interface-with-explicit-base form class(TObject, IFoo) and class(TInterfacedObject, IFoo) (TInterfacedObject likewise "not found").

What works

• A plain class (implicit TObject) — methods, fields, virtual/override all fine.
• Interfaces: tc = class(IFoo) (interface as the sole parent, implicit TObject) compiles and dispatches correctly.

So TObject (and TInterfacedObject) just are not registered as nameable base symbols; only the implicit/interface forms resolve.

Expected

TObject is a real, nameable root class; class(TObject) and class(TObject, IFoo) resolve to it (FPC).

Repro

type tc = class(TObject) procedure m; end; ... → base type not found.

Resolution (2026-06-23)

Parser (class-base list): a base name that is not a registered user class but is TObject / TInterfacedObject is now accepted as the implicit root (parentCi stays -1, same as a plain class) instead of erroring "base type not found". class(TObject), class(TObject, IFoo), class(TInterfacedObject, IFoo) all resolve. Front-end only. Gate (front-end): make bootstrap (self-host byte-identical) + class/interface tests. Closes bug-explicit-tobject-base.