diff --git a/core/src/avm2/globals/flash/text/textfield.rs b/core/src/avm2/globals/flash/text/textfield.rs
index 7cb5ed0f6..5b1cfb43e 100644
--- a/core/src/avm2/globals/flash/text/textfield.rs
+++ b/core/src/avm2/globals/flash/text/textfield.rs
@@ -679,12 +679,12 @@ pub fn get_text_format<'gc>(
         let mut begin_index = args
             .get(0)
             .cloned()
-            .unwrap_or_else(|| Value::Integer(-1))
+            .unwrap_or(Value::Integer(-1))
             .coerce_to_i32(activation)?;
         let mut end_index = args
             .get(1)
             .cloned()
-            .unwrap_or_else(|| Value::Integer(-1))
+            .unwrap_or(Value::Integer(-1))
             .coerce_to_i32(activation)?;
 
         if begin_index < 0 {
diff --git a/core/src/avm2/globals/int.rs b/core/src/avm2/globals/int.rs
index 8391b4bf7..7cf86d583 100644
--- a/core/src/avm2/globals/int.rs
+++ b/core/src/avm2/globals/int.rs
@@ -146,7 +146,7 @@ fn to_exponential<'gc>(
                 return Ok(AvmString::new_utf8(
                     activation.context.gc_context,
                     format!("{0:.1$e}", number, digits)
-                        .replace("e", "e+")
+                        .replace('e', "e+")
                         .replace("e+-", "e-")
                         .replace("e+0", ""),
                 )
diff --git a/core/src/avm2/globals/number.rs b/core/src/avm2/globals/number.rs
index c7d87adb3..8b7d7d6d5 100644
--- a/core/src/avm2/globals/number.rs
+++ b/core/src/avm2/globals/number.rs
@@ -160,7 +160,7 @@ fn to_exponential<'gc>(
                 return Ok(AvmString::new_utf8(
                     activation.context.gc_context,
                     format!("{0:.1$e}", number, digits)
-                        .replace("e", "e+")
+                        .replace('e', "e+")
                         .replace("e+-", "e-")
                         .replace("e+0", ""),
                 )
diff --git a/core/src/avm2/globals/uint.rs b/core/src/avm2/globals/uint.rs
index f6687d1c1..596ee20f4 100644
--- a/core/src/avm2/globals/uint.rs
+++ b/core/src/avm2/globals/uint.rs
@@ -146,7 +146,7 @@ fn to_exponential<'gc>(
                 return Ok(AvmString::new_utf8(
                     activation.context.gc_context,
                     format!("{0:.1$e}", number, digits)
-                        .replace("e", "e+")
+                        .replace('e', "e+")
                         .replace("e+-", "e-")
                         .replace("e+0", ""),
                 )
diff --git a/core/src/shape_utils.rs b/core/src/shape_utils.rs
index 6d0bc668f..f7f1eba2c 100644
--- a/core/src/shape_utils.rs
+++ b/core/src/shape_utils.rs
@@ -281,8 +281,7 @@ impl PendingPath {
     fn into_draw_commands(self) -> impl Iterator<Item = DrawCommand> {
         self.segments
             .into_iter()
-            .map(PathSegment::into_draw_commands)
-            .flatten()
+            .flat_map(PathSegment::into_draw_commands)
     }
 }
 
diff --git a/swf/src/string.rs b/swf/src/string.rs
index b65d43d77..d9f12a885 100644
--- a/swf/src/string.rs
+++ b/swf/src/string.rs
@@ -264,8 +264,7 @@ impl fmt::Debug for SwfStr {
         for chr in self
             .string
             .iter()
-            .map(|&c| std::ascii::escape_default(c))
-            .flatten()
+            .flat_map(|&c| std::ascii::escape_default(c))
         {
             fmt::Write::write_char(f, char::from(chr))?;
         }