diff --git a/pyo3-derive-backend/src/method.rs b/pyo3-derive-backend/src/method.rs
index 6d06c377945..e138924b868 100644
--- a/pyo3-derive-backend/src/method.rs
+++ b/pyo3-derive-backend/src/method.rs
@@ -206,17 +206,6 @@ impl<'a> FnSpec<'a> {
         false
     }
 
-    pub fn accept_args(&self) -> bool {
-        for s in self.attrs.iter() {
-            match *s {
-                Argument::VarArgs(_) => return true,
-                Argument::VarArgsSeparator => return true,
-                _ => (),
-            }
-        }
-        false
-    }
-
     pub fn is_kwargs(&self, name: &syn::Ident) -> bool {
         for s in self.attrs.iter() {
             if let Argument::KeywordArgs(ref path) = s {
@@ -226,15 +215,6 @@ impl<'a> FnSpec<'a> {
         false
     }
 
-    pub fn accept_kwargs(&self) -> bool {
-        for s in self.attrs.iter() {
-            if let Argument::KeywordArgs(_) = s {
-                return true;
-            }
-        }
-        false
-    }
-
     pub fn default_value(&self, name: &syn::Ident) -> Option<TokenStream> {
         for s in self.attrs.iter() {
             match *s {
diff --git a/pyo3-derive-backend/src/pymethod.rs b/pyo3-derive-backend/src/pymethod.rs
index 7149d9c7a27..d590d2b2752 100644
--- a/pyo3-derive-backend/src/pymethod.rs
+++ b/pyo3-derive-backend/src/pymethod.rs
@@ -406,15 +406,6 @@ fn impl_call(_cls: &syn::Type, spec: &FnSpec<'_>) -> TokenStream {
     quote! { _slf.#fname(#(#names),*) }
 }
 
-/// Converts a bool to "true" or "false"
-fn bool_to_ident(condition: bool) -> syn::Ident {
-    if condition {
-        syn::Ident::new("true", Span::call_site())
-    } else {
-        syn::Ident::new("false", Span::call_site())
-    }
-}
-
 fn impl_arg_params_(spec: &FnSpec<'_>, body: TokenStream, into_result: TokenStream) -> TokenStream {
     if spec.args.is_empty() {
         return quote! {
@@ -431,8 +422,8 @@ fn impl_arg_params_(spec: &FnSpec<'_>, body: TokenStream, into_result: TokenStre
             continue;
         }
         let name = arg.name;
-        let kwonly = bool_to_ident(spec.is_kw_only(&arg.name));
-        let opt = bool_to_ident(arg.optional.is_some() || spec.default_value(&arg.name).is_some());
+        let kwonly = spec.is_kw_only(&arg.name);
+        let opt = arg.optional.is_some() || spec.default_value(&arg.name).is_some();
 
         params.push(quote! {
             pyo3::derive_utils::ParamDescription {
@@ -449,8 +440,16 @@ fn impl_arg_params_(spec: &FnSpec<'_>, body: TokenStream, into_result: TokenStre
         param_conversion.push(impl_arg_param(&arg, &spec, idx, &mut option_pos));
     }
 
-    let accept_args = bool_to_ident(spec.accept_args());
-    let accept_kwargs = bool_to_ident(spec.accept_kwargs());
+    let (mut accept_args, mut accept_kwargs) = (false, false);
+
+    for s in spec.attrs.iter() {
+        use crate::pyfunction::Argument;
+        match s {
+            Argument::VarArgs(_) => accept_args = true,
+            Argument::KeywordArgs(_) => accept_kwargs = true,
+            _ => continue,
+        }
+    }
     let num_normal_params = params.len();
     // create array of arguments, and then parse
     quote! {
diff --git a/src/derive_utils.rs b/src/derive_utils.rs
index baa134f6e8a..019b49c5df9 100644
--- a/src/derive_utils.rs
+++ b/src/derive_utils.rs
@@ -61,7 +61,7 @@ pub fn parse_fn_args<'p>(
                 if i < nargs {
                     raise_error!("got multiple values for argument: {}", p.name)
                 }
-                kwargs.as_ref().unwrap().del_item(p.name).unwrap();
+                kwargs.as_ref().unwrap().del_item(p.name)?;
                 Some(kwarg)
             }
             None => {
diff --git a/tests/test_methods.rs b/tests/test_methods.rs
index e1b2546b66b..35906d8183f 100644
--- a/tests/test_methods.rs
+++ b/tests/test_methods.rs
@@ -231,11 +231,15 @@ impl MethArgs {
         [a.to_object(py), args.into(), kwargs.to_object(py)].to_object(py)
     }
 
+    #[args("*", c = 10)]
+    fn get_pos_arg_kw_sep(&self, a: i32, b: i32, c: i32) -> PyResult<i32> {
+        Ok(a + b + c)
+    }
+
     #[args(kwargs = "**")]
     fn get_pos_kw(&self, py: Python, a: i32, kwargs: Option<&PyDict>) -> PyObject {
         [a.to_object(py), kwargs.to_object(py)].to_object(py)
     }
-
     // "args" can be anything that can be extracted from PyTuple
     #[args(args = "*")]
     fn args_as_vec(&self, args: Vec<i32>) -> i32 {
@@ -264,7 +268,7 @@ fn meth_args() {
     py_run!(py, inst, "assert inst.get_default() == 10");
     py_run!(py, inst, "assert inst.get_default(100) == 100");
     py_run!(py, inst, "assert inst.get_kwarg() == 10");
-    py_run!(py, inst, "assert inst.get_kwarg(100) == 10");
+    py_expect_exception!(py, inst, "inst.get_kwarg(100)", TypeError);
     py_run!(py, inst, "assert inst.get_kwarg(test=100) == 100");
     py_run!(py, inst, "assert inst.get_kwargs() == [(), None]");
     py_run!(py, inst, "assert inst.get_kwargs(1,2,3) == [(1,2,3), None]");
@@ -295,6 +299,16 @@ fn meth_args() {
     py_expect_exception!(py, inst, "inst.get_pos_arg_kw(1, a=1)", TypeError);
     py_expect_exception!(py, inst, "inst.get_pos_arg_kw(b=2)", TypeError);
 
+    py_run!(py, inst, "assert inst.get_pos_arg_kw_sep(1, 2, c=3) == 6");
+    py_run!(py, inst, "assert inst.get_pos_arg_kw_sep(1, 2) == 13");
+    py_expect_exception!(py, inst, "assert inst.get_pos_arg_kw_sep(1)", TypeError);
+    py_expect_exception!(
+        py,
+        inst,
+        "assert inst.get_pos_arg_kw_sep(1, 2, 3)",
+        TypeError
+    );
+
     py_run!(py, inst, "assert inst.get_pos_kw(1, b=2) == [1, {'b': 2}]");
     py_expect_exception!(py, inst, "inst.get_pos_kw(1,2)", TypeError);