Write Ufunc_Nin0_Nout1 directly in the ufunc stub template

erfa/ufunc.pyi.templ

@@ -79,12 +79,49 @@ type YMDFDType = CustomVoidDType[np.intc]
 dt_ymdf: Final[YMDFDType]
 
 
+@type_check_only
+class Ufunc_Nin0_Nout1[NTypes: Literal[0, 1], ReturnT: np.generic](np.ufunc):  # type: ignore[misc]
+    @property
+    @override
+    def identity(self) -> None: ...
+    @property
+    @override
+    def nin(self) -> Literal[0]: ...
+    @property
+    @override
+    def nout(self) -> Literal[1]: ...
+    @property
+    @override
+    def nargs(self) -> Literal[1]: ...
+    @property
+    @override
+    def ntypes(self) -> NTypes: ...
+    @property
+    @override
+    def signature(self) -> None: ...
+    @override
+    @overload
+    def __call__(self, /, out: tuple[None] | None = None) -> ReturnT: ...
+    @overload
+    def __call__(self, /, out: EllipsisType) -> np.ndarray[tuple[()], np.dtype[ReturnT]]: ...
+    @overload
+    def __call__(self, /, out: NDArray[ReturnT] | tuple[NDArray[ReturnT]]) -> NDArray[ReturnT]: ...
+    @override
+    def at(self, a: Never, indices: Never, /) -> NoReturn: ...  # type: ignore[override]
+    @override
+    def accumulate(self, array: Never, /) -> NoReturn: ...  # type: ignore[override]
+    @override
+    def reduce(self, array: Never, /) -> NoReturn: ...  # type: ignore[override]
+    @override
+    def reduceat(self, array: Never, /, indices: Never) -> NoReturn: ...  # type: ignore[override]
+    @override
+    def outer(self, A: Never, B: Never, /) -> NoReturn: ...  # type: ignore[override]
+
+
 def get_leap_seconds() -> np.ndarray[tuple[int], np.dtype[LeapSecondDType]]: ...
 
 
 def set_leap_seconds(leap_seconds: ArrayLike) -> None: ...
 
 
-$generic_ufunc_types
-
 $funcs

erfa_generator.py

@@ -907,20 +907,8 @@ def main(srcdir: Path, templateloc: Path) -> None:
         ]),
     )
 
-    ufunc_no_methods_template = Template(
-        (templateloc / "ufunc_no_methods.templ").read_text()
-    )
-    generic_ufunc_types = []
-    for nin, nout in {(f.nin, f.nout) for f in funcs if f.signature == "NULL"}:
-        if nin <= 0 and nout <= 1:
-            generic_ufunc_types.append(
-                ufunc_no_methods_template.substitute(
-                    nin=nin, nout=nout, nargs=nin + nout
-                )
-            )
     _render_template(
         templateloc / "ufunc.pyi.templ",
-        generic_ufunc_types="\n".join(generic_ufunc_types),
         funcs="\n\n\n".join(func.ufunc_signature for func in funcs),
     )