feat!: drop forget_length in typetracer_with_report

src/awkward/_nplikes/typetracer.py

@@ -1588,13 +1588,9 @@ def _attach_report(
 
 
 def typetracer_with_report(
-    form: ak.forms.Form,
-    getkey: Callable[[Form, str], str],
-    forget_length: bool = True,
+    form: ak.forms.Form, getkey: Callable[[Form, str], str]
 ) -> tuple[ak.contents.Content, TypeTracerReport]:
-    layout = form.length_zero_array(highlevel=False).to_typetracer(
-        forget_length=forget_length
-    )
+    layout = form.length_zero_array(highlevel=False).to_typetracer(forget_length=True)
     report = TypeTracerReport()
     _attach_report(layout, form, report, getkey)
     return layout, report

src/awkward/typetracer.py

@@ -7,7 +7,6 @@
 import awkward.forms
 from awkward._backends.typetracer import TypeTracerBackend
 from awkward._do import touch_data as _touch_data
-from awkward._errors import deprecate
 from awkward._layout import HighLevelContext, wrap_layout
 from awkward._nplikes.placeholder import PlaceholderArray
 from awkward._nplikes.shape import unknown_length
@@ -20,7 +19,6 @@
     typetracer_with_report as _typetracer_with_report,
 )
 from awkward._typing import Any, TypeVar
-from awkward._util import UNSET
 from awkward.contents import Content
 from awkward.forms import Form
 from awkward.forms.form import regularize_buffer_key
@@ -153,7 +151,6 @@ def touch_data(
 
 def typetracer_with_report(
     form: Form | str | Mapping,
-    forget_length: bool = UNSET,
     *,
     buffer_key: str | Callable = "{form_key}",
     highlevel: bool = False,
@@ -190,21 +187,9 @@ def typetracer_with_report(
             "'form' argument must be a Form or its Python dict/JSON string representation"
         )
 
-    if forget_length is UNSET:
-        forget_length = True
-    else:
-        deprecate(
-            "passing `forget_length` to typetracer_with_report is deprecated. "
-            "In future, this argument will be removed, and the function will "
-            "always forget lengths",
-            "2.5.0",
-        )
-
     getkey = regularize_buffer_key(buffer_key)
 
-    layout, report = _typetracer_with_report(
-        form, getkey=getkey, forget_length=forget_length
-    )
+    layout, report = _typetracer_with_report(form, getkey=getkey)
     return wrap_layout(
         layout, behavior=behavior, highlevel=highlevel, attrs=attrs
     ), report

tests/test_2806_attrs_typetracer.py

@@ -5,9 +5,7 @@
 import pytest
 
 import awkward as ak
-from awkward.typetracer import (
-    typetracer_with_report,
-)
+from awkward.typetracer import typetracer_with_report
 
 SOME_ATTRS = {"foo": "FOO"}