diff --git a/src/parser.rs b/src/parser.rs
index df32f21..923024f 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -152,8 +152,8 @@ fn is_line_blank_or_whitespace(line: &str) -> bool {
 }
 
 fn is_line_footnote(line: &str) -> bool {
-    if line.starts_with('[') {
-        let mut chars = line[1..].chars();
+    if let Some(rest) = line.strip_prefix('[') {
+        let mut chars = rest.chars();
         if chars.next() == Some(']') {
             // Reject "[]"
             return false;
@@ -245,8 +245,7 @@ fn line_as_list_item(line: &str) -> Option<Token> {
     let mut li_state = LiState::New;
     let mut ix_li_type_start = 0;
     let mut ix_li_content_start: Option<usize> = None;
-    let mut iter = line.char_indices();
-    while let Some((ix, c)) = iter.next() {
+    for (ix, c) in line.char_indices() {
         match li_state {
             LiState::New | LiState::IndentSp1 | LiState::IndentSp2 => {
                 ix_li_type_start = ix;