diff --git a/Tools/langtool/Cargo.lock b/Tools/langtool/Cargo.lock
index 5cd7e28f37..70ea905488 100644
--- a/Tools/langtool/Cargo.lock
+++ b/Tools/langtool/Cargo.lock
@@ -76,9 +76,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.139"
+version = "0.2.140"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "201de327520df007757c1f0adce6e827fe8562fbc28bfd9c15571c66ca1f5f79"
+checksum = "99227334921fae1a979cf0bfdfcc6b3e5ce376ef57e16fb6fb3ea2ed6095f80c"
 
 [[package]]
 name = "proc-macro-error"
@@ -106,9 +106,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.50"
+version = "1.0.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ef7d57beacfaf2d8aee5937dab7b7f28de3cb8b1828479bb5de2a7106f2bae2"
+checksum = "5d727cae5b39d21da60fa540906919ad737832fe0b1c165da3a34d6548c849d6"
 dependencies = [
  "unicode-ident",
 ]
@@ -154,9 +154,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.107"
+version = "1.0.109"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1f4064b5b16e03ae50984a5a8ed5d4f8803e6bc1fd170a3cda91a1be4b18e3f5"
+checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -174,9 +174,9 @@ dependencies = [
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.6"
+version = "1.0.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "84a22b9f218b40614adcb3f4ff08b703773ad44fa9423e4e0d346d5db86e4ebc"
+checksum = "e5464a87b239f13a63a501f2701565754bae92d243d4bb7eb12f6d57d2269bf4"
 
 [[package]]
 name = "unicode-segmentation"
diff --git a/Tools/langtool/Cargo.toml b/Tools/langtool/Cargo.toml
index b18910d38f..42ef423cf6 100644
--- a/Tools/langtool/Cargo.toml
+++ b/Tools/langtool/Cargo.toml
@@ -5,4 +5,4 @@ name = "langtool"
 version = "0.1.0"
 
 [dependencies]
-structopt = "0.3"
+structopt = "0.3.26"
diff --git a/Tools/langtool/src/main.rs b/Tools/langtool/src/main.rs
index 45b79e50f7..f18060959c 100644
--- a/Tools/langtool/src/main.rs
+++ b/Tools/langtool/src/main.rs
@@ -100,7 +100,7 @@ fn move_key(target_ini: &mut IniFile, old: &str, new: &str, key: &str) -> io::Re
 
 fn remove_key(target_ini: &mut IniFile, section: &str, key: &str) -> io::Result<()> {
     if let Some(old_section) = target_ini.get_section_mut(section) {
-        let _ = old_section.remove_line(key);
+        old_section.remove_line(key);
     } else {
         println!("No section {}", section);
     }
@@ -109,7 +109,7 @@ fn remove_key(target_ini: &mut IniFile, section: &str, key: &str) -> io::Result<
 
 fn add_new_key(target_ini: &mut IniFile, section: &str, key: &str) -> io::Result<()> {
     if let Some(section) = target_ini.get_section_mut(section) {
-        let _ = section.insert_line_if_missing(&format!("{} = {}", key, key));
+        section.insert_line_if_missing(&format!("{} = {}", key, key));
     } else {
         println!("No section {}", section);
     }
@@ -118,7 +118,7 @@ fn add_new_key(target_ini: &mut IniFile, section: &str, key: &str) -> io::Result
 
 fn rename_key(target_ini: &mut IniFile, section: &str, old: &str, new: &str) -> io::Result<()> {
     if let Some(section) = target_ini.get_section_mut(section) {
-        let _ = section.rename_key(old, new);
+        section.rename_key(old, new);
     } else {
         println!("No section {}", section);
     }
@@ -178,13 +178,13 @@ fn main() {
 
         match opt.cmd {
             Command::CopyMissingLines {} => {
-                copy_missing_lines(&reference_ini, &mut target_ini).unwrap();
+                copy_missing_lines(reference_ini, &mut target_ini).unwrap();
             }
             Command::CommentUnknownLines {} => {
-                deal_with_unknown_lines(&reference_ini, &mut target_ini, false).unwrap();
+                deal_with_unknown_lines(reference_ini, &mut target_ini, false).unwrap();
             }
             Command::RemoveUnknownLines {} => {
-                deal_with_unknown_lines(&reference_ini, &mut target_ini, true).unwrap();
+                deal_with_unknown_lines(reference_ini, &mut target_ini, true).unwrap();
             }
             Command::SortSection { ref section } => sort_section(&mut target_ini, section).unwrap(),
             Command::RenameKey {
diff --git a/Tools/langtool/src/section.rs b/Tools/langtool/src/section.rs
index 0ccfad7a48..1884957a53 100644
--- a/Tools/langtool/src/section.rs
+++ b/Tools/langtool/src/section.rs
@@ -20,7 +20,7 @@ impl Section {
                 continue;
             };
 
-            if prefix.eq_ignore_ascii_case(&key) {
+            if prefix.eq_ignore_ascii_case(key) {
                 remove_index = Some(index);
                 break;
             }
@@ -140,11 +140,9 @@ impl Section {
             if prefix.starts_with("Font") || prefix.starts_with('#') {
                 return true;
             }
-            if !other.lines.iter().any(|line| line.starts_with(prefix)) {
-                false
-            } else {
-                true
-            }
+
+            // keeps the line if this expression returns true.
+            other.lines.iter().any(|line| line.starts_with(prefix))
         });
     }
 }