Fix subkeys, write comparison test

1 files changed, 6 insertions, 1 deletions

diff --git a/src/lib.rs b/src/lib.rs
index bd01f59..dc29621 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -14,6 +14,9 @@ use alloc::{format, vec};
 use core::fmt;
 use core::mem::take;
 
+#[cfg(test)]
+mod tests;
+
 /// File and line information
 #[derive(Clone, Debug)]
 pub struct Location {
@@ -635,6 +638,8 @@ impl Configuration {
 	///
 	/// `reader` can be `&str`, `&[u8]`, or anything that implements [`std::io::BufRead`]
 	/// (if the `std` feature is enabled) such as `std::io::BufReader<std::fs::File>`.
+	///
+	/// `filename` is used in error messages.
 	pub fn load<R: Read>(filename: &str, mut reader: R) -> Result<Self> {
 		// avoid big code size by using dyn reference.
 		// the impact on performance is not really important.
@@ -717,7 +722,7 @@ impl Configuration {
 	pub fn subkeys(&self, key: &str) -> impl '_ + Iterator<Item = &str> {
 		let key_dot = format!("{key}.");
 		let start_idx = self.first_subkey_index(key);
-		(start_idx..).map_while(move |i| {
+		(start_idx..self.items.len()).map_while(move |i| {
 			let this_key = &self.items[i].0;
 			let suffix = this_key.strip_prefix(&key_dot)?;
 			Some(suffix.split_once('.').map_or(suffix, |(x, _)| x))