diff --git a/parser/src/passes/fold_double_amp.c b/parser/src/passes/fold_double_amp.c
new file mode 100644
index 00000000..6d37932f
--- /dev/null
+++ b/parser/src/passes/fold_double_amp.c
@@ -0,0 +1,49 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   fold_double_amp.c                                  :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: maiboyer <maiboyer@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/10/02 19:04:32 by maiboyer          #+#    #+#             */
+/*   Updated: 2024/10/04 18:55:34 by rparodi          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "parser/passes.h"
+#include "me/types.h"
+#include "me/vec/vec_token.h"
+#include "parser/token.h"
+
+/// This is a sample pass
+///
+/// There is a few rules the rest of the tokenizer machinery assumes
+/// theses function follows:
+/// 	- the input vec WILL be freed when the function return, even in
+/// 		case of error
+/// 	- the output vector isn't populated if the function returns an error,
+/// 		thus it shouldn't be freed in case of error
+/// 	- the output tokens may not be direct copy of the input tokens,
+/// 		but need to be cloned (different allocations for stuff)
+
+t_error	ts_double_amp(t_vec_token input, t_vec_token *output)
+{
+	t_vec_token	out;
+	t_usize		i;
+
+	i = 0;
+	out = vec_token_new(input.len, token_free);
+	while (i < input.len)
+	{
+		if (i + 1 >= input.len)
+			vec_token_push(&out, token_clone(&input.buffer[i]));
+		else if (input.buffer[i].type == TOK_AMP
+				&& input.buffer[i + 1].type == TOK_AMP)
+			vec_token_push(&out, token_new(TOK_AND));
+		else
+			vec_token_push(&out, token_clone(&input.buffer[i]));
+		i++;
+	}
+	vec_token_free(input);
+	return (*output = out, NO_ERROR);
+}
diff --git a/parser/src/passes/fold_double_lcarret.c b/parser/src/passes/fold_double_lcarret.c
new file mode 100644
index 00000000..ee741037
--- /dev/null
+++ b/parser/src/passes/fold_double_lcarret.c
@@ -0,0 +1,71 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   fold_double_lcarret.c                              :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: maiboyer <maiboyer@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/10/02 19:04:32 by maiboyer          #+#    #+#             */
+/*   Updated: 2024/10/04 18:58:16 by rparodi          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "parser/passes.h"
+#include "me/types.h"
+#include "me/vec/vec_token.h"
+#include "parser/token.h"
+
+/// This is a sample pass
+///
+/// There is a few rules the rest of the tokenizer machinery assumes
+/// theses function follows:
+/// 	- the input vec WILL be freed when the function return, even in
+/// 		case of error
+/// 	- the output vector isn't populated if the function returns an error,
+/// 		thus it shouldn't be freed in case of error
+/// 	- the output tokens may not be direct copy of the input tokens,
+/// 		but need to be cloned (different allocations for stuff)
+
+t_error	ts_double_lcarret(t_vec_token input, t_vec_token *output)
+{
+	t_vec_token	out;
+	t_usize		i;
+
+	i = 0;
+	out = vec_token_new(input.len, token_free);
+	while (i < input.len)
+	{
+		if (i + 1 >= input.len)
+			vec_token_push(&out, token_clone(&input.buffer[i]));
+		else if (input.buffer[i].type == TOK_LCARRET
+				&& input.buffer[i + 1].type == TOK_LCARRET)
+			vec_token_push(&out, token_new(TOK_DLCARRET));
+		else
+			vec_token_push(&out, token_clone(&input.buffer[i]));
+		i++;
+	}
+	vec_token_free(input);
+	return (*output = out, NO_ERROR);
+}
+
+t_error	ts_double_rcarret(t_vec_token input, t_vec_token *output)
+{
+	t_vec_token	out;
+	t_usize		i;
+
+	i = 0;
+	out = vec_token_new(input.len, token_free);
+	while (i < input.len)
+	{
+		if (i + 1 >= input.len)
+			vec_token_push(&out, token_clone(&input.buffer[i]));
+		else if (input.buffer[i].type == TOK_RCARRET
+				&& input.buffer[i + 1].type == TOK_RCARRET)
+			vec_token_push(&out, token_new(TOK_DRCARRET));
+		else
+			vec_token_push(&out, token_clone(&input.buffer[i]));
+		i++;
+	}
+	vec_token_free(input);
+	return (*output = out, NO_ERROR);
+}