Update to Rust 1.75

rslib/src/cloze.rs

@@ -146,7 +146,7 @@ impl ExtractedCloze<'_> {
 
     /// If cloze starts with image-occlusion:, return the text following that.
     fn image_occlusion(&self) -> Option<&str> {
-        let Some(first_node) = self.nodes.get(0) else {
+        let Some(first_node) = self.nodes.first() else {
             return None;
         };
         let TextOrCloze::Text(text) = first_node else {

rslib/src/import_export/text/csv/metadata.rs

@@ -460,7 +460,7 @@ fn ensure_first_field_is_mapped(
 fn maybe_set_fallback_columns(metadata: &mut CsvMetadata) -> Result<()> {
     if metadata.column_labels.is_empty() {
         metadata.column_labels =
-            vec![String::new(); metadata.preview.get(0).map_or(0, |row| row.vals.len())];
+            vec![String::new(); metadata.preview.first().map_or(0, |row| row.vals.len())];
     }
     Ok(())
 }

rslib/src/import_export/text/import.rs

@@ -483,7 +483,7 @@ impl DuplicateUpdateResult {
 impl NoteContext<'_> {
     fn is_guid_dupe(&self) -> bool {
         self.dupes
-            .get(0)
+            .first()
             .map_or(false, |d| d.note.guid == self.note.guid)
     }
 
@@ -570,11 +570,11 @@ impl ForeignNote {
     }
 
     fn first_field_is_the_empty_string(&self) -> bool {
-        matches!(self.fields.get(0), Some(Some(s)) if s.is_empty())
+        matches!(self.fields.first(), Some(Some(s)) if s.is_empty())
     }
 
     fn first_field_is_unempty(&self) -> bool {
-        matches!(self.fields.get(0), Some(Some(s)) if !s.is_empty())
+        matches!(self.fields.first(), Some(Some(s)) if !s.is_empty())
     }
 
     fn normalize_fields(&mut self, normalize_text: bool) {
@@ -595,7 +595,7 @@ impl ForeignNote {
 
     fn first_field_stripped(&self) -> Option<Cow<str>> {
         self.fields
-            .get(0)
+            .first()
             .and_then(|s| s.as_ref())
             .map(|field| strip_html_preserving_media_filenames(field.as_str()))
     }

rslib/src/notes/mod.rs

@@ -564,7 +564,7 @@ impl Collection {
     /// notetypes, check if there is a cloze in a non-cloze field or if there's
     /// no cloze at all. For other notetypes, just check if there's a cloze.
     pub fn note_fields_check(&mut self, note: &Note) -> Result<NoteFieldsState> {
-        Ok(if let Some(text) = note.fields.get(0) {
+        Ok(if let Some(text) = note.fields.first() {
             let field1 = if self.get_config_bool(BoolKey::NormalizeNoteText) {
                 normalize_to_nfc(text)
             } else {

rslib/src/notetype/mod.rs

@@ -132,7 +132,7 @@ impl Notetype {
     /// always return the first and only template.
     pub fn get_template(&self, card_ord: u16) -> Result<&CardTemplate> {
         let template = if self.config.kind() == NotetypeKind::Cloze {
-            self.templates.get(0)
+            self.templates.first()
         } else {
             self.templates.get(card_ord as usize)
         };
@@ -553,7 +553,7 @@ impl Notetype {
         fields: HashMap<String, Option<String>>,
         parsed: &mut [(Option<ParsedTemplate>, Option<ParsedTemplate>)],
     ) {
-        let first_remaining_field_name = &self.fields.get(0).unwrap().name;
+        let first_remaining_field_name = &self.fields.first().unwrap().name;
         let is_cloze = self.is_cloze();
         for (idx, (q_opt, a_opt)) in parsed.iter_mut().enumerate() {
             if let Some(q) = q_opt {
@@ -616,7 +616,7 @@ impl Notetype {
     pub(crate) fn cloze_fields(&self) -> HashSet<usize> {
         if !self.is_cloze() {
             HashSet::new()
-        } else if let Some((Some(front), _)) = self.parsed_templates().get(0) {
+        } else if let Some((Some(front), _)) = self.parsed_templates().first() {
             front
                 .all_referenced_cloze_field_names()
                 .iter()
@@ -647,7 +647,7 @@ fn missing_cloze_filter(
     parsed_templates: &[(Option<ParsedTemplate>, Option<ParsedTemplate>)],
 ) -> bool {
     parsed_templates
-        .get(0)
+        .first()
         .map_or(true, |t| !has_cloze(&t.0) || !has_cloze(&t.1))
 }
 

rslib/src/notetype/render.rs

@@ -58,7 +58,7 @@ impl Collection {
             .or_invalid("no such notetype")?;
         let template = match nt.config.kind() {
             NotetypeKind::Normal => nt.templates.get(card.template_idx as usize),
-            NotetypeKind::Cloze => nt.templates.get(0),
+            NotetypeKind::Cloze => nt.templates.first(),
         }
         .or_invalid("missing template")?;
 

rslib/src/revlog/mod.rs

@@ -92,12 +92,11 @@ impl Collection {
         original_interval: u32,
         usn: Usn,
     ) -> Result<()> {
-        let ease_factor = u32::try_from(
+        let ease_factor = u32::from(
             card.memory_state
                 .map(|s| ((s.difficulty_shifted() * 1000.) as u16))
                 .unwrap_or(card.ease_factor),
-        )
+        );
-        .unwrap_or_default();
         let entry = RevlogEntry {
             id: RevlogId::new(),
             cid: card.id,

rslib/src/scheduler/new.rs

@@ -299,6 +299,15 @@ impl Collection {
     }
 }
 
+impl From<NewCardInsertOrder> for NewCardDueOrder {
+    fn from(o: NewCardInsertOrder) -> Self {
+        match o {
+            NewCardInsertOrder::Due => NewCardDueOrder::NoteId,
+            NewCardInsertOrder::Random => NewCardDueOrder::Random,
+        }
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::*;
@@ -374,12 +383,3 @@ mod test {
         assert_eq!((card.due, card.reps, card.lapses), (1, 0, 0));
     }
 }
-
-impl From<NewCardInsertOrder> for NewCardDueOrder {
-    fn from(o: NewCardInsertOrder) -> Self {
-        match o {
-            NewCardInsertOrder::Due => NewCardDueOrder::NoteId,
-            NewCardInsertOrder::Random => NewCardDueOrder::Random,
-        }
-    }
-}

rslib/src/scheduler/queue/mod.rs

@@ -80,7 +80,7 @@ pub(crate) struct BuryMode {
 impl Collection {
     pub fn get_next_card(&mut self) -> Result<Option<QueuedCard>> {
         self.get_queued_cards(1, false)
-            .map(|queued| queued.cards.get(0).cloned())
+            .map(|queued| queued.cards.first().cloned())
     }
 
     pub fn get_queued_cards(

rslib/src/template.rs

@@ -647,7 +647,7 @@ pub fn render_card(
     context.frontside = if context.partial_for_python {
         Some("")
     } else {
-        let Some(RenderedNode::Text { text }) = &qnodes.get(0) else {
+        let Some(RenderedNode::Text { text }) = &qnodes.first() else {
             invalid_input!("should not happen: first node not text");
         };
         Some(text)

rust-toolchain.toml

@@ -1,3 +1,3 @@
 [toolchain]
 # older versions may fail to compile; newer versions may fail the clippy tests
-channel = "1.74"
+channel = "1.75"