clippy: Apply fix for get_first lint

fluent-bundle/examples/custom_formatter.rs

@@ -36,7 +36,7 @@ key-var-with-arg = Here is a variable formatted with an argument { NUMBER($num,
         .expect("Failed to add FTL resources to the bundle.");
     bundle
         .add_function("NUMBER", |positional, named| {
-            match positional.get(0) {
+            match positional.first() {
                 Some(FluentValue::Number(n)) => {
                     let mut num = n.clone();
                     // This allows us to merge the arguments provided

fluent-bundle/examples/custom_type.rs

@@ -165,7 +165,7 @@ key-date = Today is { DATETIME($epoch, dateStyle: "long", timeStyle: "short") }
         .expect("Failed to add FTL resources to the bundle.");
 
     bundle
-        .add_function("DATETIME", |positional, named| match positional.get(0) {
+        .add_function("DATETIME", |positional, named| match positional.first() {
             Some(FluentValue::Number(n)) => {
                 let epoch = n.value as usize;
                 let options = named.into();

fluent-bundle/examples/functions.rs

@@ -22,7 +22,7 @@ fn main() {
     // Test for a function that accepts unnamed positional arguments
     bundle
         .add_function("MEANING_OF_LIFE", |args, _named_args| {
-            if let Some(arg0) = args.get(0) {
+            if let Some(arg0) = args.first() {
                 if *arg0 == 42.into() {
                     return "The answer to life, the universe, and everything".into();
                 }

fluent-bundle/examples/simple-app.rs

@@ -94,8 +94,7 @@ fn main() {
         Some(&default_locale),
         NegotiationStrategy::Filtering,
     );
-    let current_locale = resolved_locales
-        .get(0)
+    let current_locale = resolved_locales.first()
         .cloned()
         .expect("At least one locale should match.");
 

fluent-bundle/src/bundle.rs

@@ -577,7 +577,7 @@ impl<R> FluentBundle<R, IntlLangMemoizer> {
     ///
     /// This will panic if no formatters can be found for the locales.
     pub fn new(locales: Vec<LanguageIdentifier>) -> Self {
-        let first_locale = locales.get(0).cloned().unwrap_or_default();
+        let first_locale = locales.first().cloned().unwrap_or_default();
         Self {
             locales,
             resources: vec![],

fluent-bundle/src/concurrent.rs

@@ -30,7 +30,7 @@ impl<R> FluentBundle<R> {
     ///     FluentBundle::new_concurrent(vec![langid_en]);
     /// ```
     pub fn new_concurrent(locales: Vec<LanguageIdentifier>) -> Self {
-        let first_locale = locales.get(0).cloned().unwrap_or_default();
+        let first_locale = locales.first().cloned().unwrap_or_default();
         Self {
             locales,
             resources: vec![],

fluent-bundle/tests/custom_types.rs

@@ -146,7 +146,7 @@ key-ref = Hello { DATETIME($date, dateStyle: "full") } World
     bundle.set_use_isolating(false);
 
     bundle
-        .add_function("DATETIME", |positional, named| match positional.get(0) {
+        .add_function("DATETIME", |positional, named| match positional.first() {
             Some(FluentValue::Custom(custom)) => {
                 if let Some(that) = custom.as_ref().as_any().downcast_ref::<DateTime>() {
                     let mut dt = that.clone();
@@ -202,7 +202,7 @@ key-num-explicit = Hello { NUMBER(5, minimumFractionDigits: 2) } World
     bundle.set_use_isolating(false);
 
     bundle
-        .add_function("NUMBER", |positional, named| match positional.get(0) {
+        .add_function("NUMBER", |positional, named| match positional.first() {
             Some(FluentValue::Number(n)) => {
                 let mut num = n.clone();
                 num.options.merge(named);

fluent-bundle/tests/function.rs

@@ -24,7 +24,7 @@ liked-count2 = { NUMBER($num) ->
     let mut bundle = FluentBundle::default();
 
     bundle
-        .add_function("NUMBER", |positional, named| match positional.get(0) {
+        .add_function("NUMBER", |positional, named| match positional.first() {
             Some(FluentValue::Number(n)) => {
                 let mut num = n.clone();
                 num.options.merge(named);

fluent-bundle/tests/resolver_fixtures.rs

@@ -155,10 +155,10 @@ fn create_bundle(
                         .into()
                 }),
                 "IDENTITY" => bundle.add_function(f.as_str(), |args, _name_args| {
-                    args.get(0).cloned().unwrap_or(FluentValue::Error)
+                    args.first().cloned().unwrap_or(FluentValue::Error)
                 }),
                 "NUMBER" => bundle.add_function(f.as_str(), |args, _name_args| {
-                    args.get(0).expect("Argument must be passed").clone()
+                    args.first().expect("Argument must be passed").clone()
                 }),
                 _ => unimplemented!("No such function."),
             };

fluent-fallback/tests/localization_test.rs

@@ -454,7 +454,7 @@ fn localization_format_missing_argument_error() {
 
     let msgs = bundles.format_messages_sync(&keys, &mut errors).unwrap();
     assert_eq!(
-        msgs.get(0).unwrap().as_ref().unwrap().value,
+        msgs.first().unwrap().as_ref().unwrap().value,
         Some(Cow::Borrowed("Hello, John. [en]"))
     );
     assert_eq!(errors.len(), 0);
@@ -465,7 +465,7 @@ fn localization_format_missing_argument_error() {
     }];
     let msgs = bundles.format_messages_sync(&keys, &mut errors).unwrap();
     assert_eq!(
-        msgs.get(0).unwrap().as_ref().unwrap().value,
+        msgs.first().unwrap().as_ref().unwrap().value,
         Some(Cow::Borrowed("Hello, {$userName}. [en]"))
     );
     assert_eq!(

fluent-syntax/src/serializer.rs

@@ -371,7 +371,7 @@ impl<'s, S: Slice<'s>> Pattern<S> {
     }
 
     fn has_leading_text_dot(&self) -> bool {
-        if let Some(PatternElement::TextElement { value }) = self.elements.get(0) {
+        if let Some(PatternElement::TextElement { value }) = self.elements.first() {
             value.as_ref().starts_with('.')
         } else {
             false