Clippy: Fix manual_is_ascii_check

Author: Serial-ATA

src/id3/v2/frame/id.rs

@@ -41,7 +41,7 @@ impl FrameID {
 
 	pub(crate) fn verify_id(id_str: &str) -> Result<()> {
 		for c in id_str.chars() {
-			if !('A'..='Z').contains(&c) && !('0'..='9').contains(&c) {
+			if !c.is_ascii_uppercase() && !c.is_ascii_digit() {
 				return Err(ID3v2Error::new(ID3v2ErrorKind::BadFrameID).into());
 			}
 		}
@@ -59,7 +59,7 @@ impl TryFrom<&ItemKey> for FrameID {
 				if unknown.len() == 4
 					&& unknown
 						.chars()
-						.all(|c| ('A'..='Z').contains(&c) || ('0'..='9').contains(&c)) =>
+						.all(|c| c.is_ascii_uppercase() || c.is_ascii_digit()) =>
 			{
 				Ok(Self::Valid(unknown.clone()))
 			},

src/id3/v2/items/language_frame.rs

@@ -42,7 +42,7 @@ impl LanguageFrame {
 	pub fn as_bytes(&self) -> Result<Vec<u8>> {
 		let mut bytes = vec![self.encoding as u8];
 
-		if self.language.len() != 3 || self.language.iter().any(|c| !(b'a'..=b'z').contains(&c)) {
+		if self.language.len() != 3 || self.language.iter().any(|c| !c.is_ascii_lowercase()) {
 			return Err(ID3v2Error::new(ID3v2ErrorKind::Other(
 				"Invalid frame language found (expected 3 ascii characters)",
 			))

src/id3/v2/items/sync_text.rs

@@ -192,10 +192,7 @@ impl SynchronizedText {
 		let mut data = vec![information.encoding as u8];
 
 		if information.language.len() == 3
-			&& information
-				.language
-				.chars()
-				.all(|c| ('a'..='z').contains(&c))
+			&& information.language.chars().all(|c| c.is_ascii_lowercase())
 		{
 			data.write_all(information.language.as_bytes())?;
 			data.write_u8(information.timestamp_format as u8)?;

src/iff/wav/tag/read.rs

@@ -39,5 +39,5 @@ pub(super) fn verify_key(key: &str) -> bool {
 	key.len() == 4
 		&& key
 			.chars()
-			.all(|c| ('A'..='Z').contains(&c) || ('0'..='9').contains(&c))
+			.all(|c| c.is_ascii_uppercase() || c.is_ascii_digit())
 }