diff --git a/rust/main.rs b/rust/main.rs
index bedc365..b0014d2 100644
--- a/rust/main.rs
+++ b/rust/main.rs
@@ -29,7 +29,7 @@ fn main() {
             println!("  {}", puzzle.number());
             let input = fs::read_to_string(format!("../inputs/{}/{}", t, puzzle.number()))
                 .expect("no input file");
-            puzzle.with_parts(&input, &|n, run| {
+            puzzle.with_parts(*is_real_data, &input, &|n, run| {
                 let expected =
                     fs::read_to_string(format!("../outputs/{}/{}/{}", t, puzzle.number(), n))
                         .expect("no golden file");
@@ -53,14 +53,14 @@ fn main() {
 
 pub trait SomePuzzle {
     fn number(&self) -> u32;
-    fn with_parts(&self, input: &str, f: &dyn Fn(usize, &dyn Fn() -> String));
+    fn with_parts(&self, is_real_data: bool, input: &str, f: &dyn Fn(usize, &dyn Fn() -> String));
 }
 impl<Input, const N: usize> SomePuzzle for Puzzle<Input, { N }> {
     fn number(&self) -> u32 {
         self.number
     }
-    fn with_parts(&self, s: &str, f: &dyn Fn(usize, &dyn Fn() -> String)) {
-        let input = (self.parser)(s);
+    fn with_parts(&self, is_real_data: bool, s: &str, f: &dyn Fn(usize, &dyn Fn() -> String)) {
+        let input = (self.parser)(is_real_data, s);
         for (i, p) in self.parts.iter().enumerate() {
             f(i + 1, &|| p(&input));
         }
diff --git a/rust/puzzle.rs b/rust/puzzle.rs
index 8f01d12..391a7a9 100644
--- a/rust/puzzle.rs
+++ b/rust/puzzle.rs
@@ -1,5 +1,5 @@
 pub struct Puzzle<Input, const N: usize> {
     pub number: u32,
-    pub parser: fn(&str) -> Input,
+    pub parser: fn(bool, &str) -> Input,
     pub parts: [fn(&Input) -> String; N],
 }
diff --git a/rust/puzzles/day1.rs b/rust/puzzles/day1.rs
index 510a107..2ffc442 100644
--- a/rust/puzzles/day1.rs
+++ b/rust/puzzles/day1.rs
@@ -11,7 +11,7 @@ use nom::{
 
 pub const PUZZLE: Puzzle<Vec<(Direction, i32)>, 2> = Puzzle {
     number: 1,
-    parser: |input| {
+    parser: |_, input| {
         terminated::<_, _, Error<&str>, _, _>(
             terminated(
                 separated_list1(
diff --git a/rust/puzzles/day2.rs b/rust/puzzles/day2.rs
index 1171c55..9c0365c 100644
--- a/rust/puzzles/day2.rs
+++ b/rust/puzzles/day2.rs
@@ -10,7 +10,7 @@ use nom::{
 
 pub const PUZZLE: Puzzle<Vec<(usize, usize)>, 2> = Puzzle {
     number: 2,
-    parser: |input| {
+    parser: |_, input| {
         terminated::<_, _, Error<&str>, _, _>(
             terminated(
                 separated_list1(char(','), separated_pair(usize, char('-'), usize)),
diff --git a/rust/puzzles/day3.rs b/rust/puzzles/day3.rs
index ceb7e7f..1b85782 100644
--- a/rust/puzzles/day3.rs
+++ b/rust/puzzles/day3.rs
@@ -10,7 +10,7 @@ use nom::{
 
 pub const PUZZLE: Puzzle<Vec<Vec<u8>>, 2> = Puzzle {
     number: 3,
-    parser: |input| {
+    parser: |_, input| {
         terminated::<_, _, Error<&str>, _, _>(
             terminated(
                 separated_list1(
diff --git a/rust/puzzles/day4.rs b/rust/puzzles/day4.rs
index 91fbe1d..6779d1f 100644
--- a/rust/puzzles/day4.rs
+++ b/rust/puzzles/day4.rs
@@ -11,7 +11,7 @@ use nom::{
 
 pub const PUZZLE: Puzzle<Vec<Vec<InTile>>, 2> = Puzzle {
     number: 4,
-    parser: |input| {
+    parser: |_, input| {
         terminated::<_, _, Error<&str>, _, _>(
             terminated(
                 separated_list1(
diff --git a/rust/puzzles/day5.rs b/rust/puzzles/day5.rs
index 92ad227..4b74cdd 100644
--- a/rust/puzzles/day5.rs
+++ b/rust/puzzles/day5.rs
@@ -11,7 +11,7 @@ use nom::{
 
 pub const PUZZLE: Puzzle<(Vec<Range>, Vec<usize>), 2> = Puzzle {
     number: 5,
-    parser: |input| {
+    parser: |_, input| {
         terminated::<_, _, Error<&str>, _, _>(
             separated_pair(
                 separated_list1(
diff --git a/rust/puzzles/day6.rs b/rust/puzzles/day6.rs
index e7643df..3207dee 100644
--- a/rust/puzzles/day6.rs
+++ b/rust/puzzles/day6.rs
@@ -13,7 +13,7 @@ use std::ops::{Add, Mul};
 
 pub const PUZZLE: Puzzle<(Vec<Op>, Vec<Vec<Option<u8>>>), 2> = Puzzle {
     number: 6,
-    parser: |input| {
+    parser: |_, input| {
         terminated::<_, _, Error<&str>, _, _>(
             (
                 terminated(
diff --git a/rust/puzzles/day7.rs b/rust/puzzles/day7.rs
index 120f231..036921a 100644
--- a/rust/puzzles/day7.rs
+++ b/rust/puzzles/day7.rs
@@ -13,7 +13,7 @@ use std::collections::{HashMap, HashSet};
 
 pub const PUZZLE: Puzzle<(usize, Vec<HashSet<usize>>), 2> = Puzzle {
     number: 7,
-    parser: |input| {
+    parser: |_, input| {
         terminated::<_, _, Error<&str>, _, _>(
             terminated(
                 (