Make more variables immutable.

  - With the MIR-based borrow-checker being more precise than the
    AST-based one, we can make more variables immutable.

3 files changed, 4 insertions, 4 deletions

diff --git a/tool/src/commands/mod.rs b/tool/src/commands/mod.rs
index c0e8ad68..30a833a1 100644
--- a/tool/src/commands/mod.rs
+++ b/tool/src/commands/mod.rs
@@ -49,7 +49,7 @@ fn get_signing_keys(tpks: &[openpgp::TPK]) -> Result<Vec<crypto::KeyPair>> {
             .signing_capable()
             .map(|k| k.2)
         {
-            if let Some(mut secret) = key.secret() {
+            if let Some(secret) = key.secret() {
                 let unencrypted = match secret {
                     SecretKey::Encrypted(ref e) => {
                         let password = rpassword::read_password_from_tty(Some(
diff --git a/tool/src/commands/sign.rs b/tool/src/commands/sign.rs
index 3bf56daa..749781dc 100644
--- a/tool/src/commands/sign.rs
+++ b/tool/src/commands/sign.rs
@@ -45,7 +45,7 @@ fn sign_data(input: &mut io::Read, output_path: Option<&str>,
             let mut ppr =
                 openpgp::parse::PacketParser::from_file(output_path.unwrap())?;
 
-            while let PacketParserResult::Some(mut pp) = ppr {
+            while let PacketParserResult::Some(pp) = ppr {
                 let (packet, ppr_tmp) = pp.recurse()?;
                 ppr = ppr_tmp;
 
diff --git a/tool/src/sq.rs b/tool/src/sq.rs
index 408a320f..ec2fe2f8 100644
--- a/tool/src/sq.rs
+++ b/tool/src/sq.rs
@@ -219,7 +219,7 @@ fn real_main() -> Result<(), failure::Error> {
         ("autocrypt", Some(m)) => {
             match m.subcommand() {
                 ("decode",  Some(m)) => {
-                    let mut input = open_or_stdin(m.value_of("input"))?;
+                    let input = open_or_stdin(m.value_of("input"))?;
                     let mut output = create_or_stdout(m.value_of("output"), force)?;
                     let ac = autocrypt::AutocryptHeaders::from_reader(input)?;
                     for h in &ac.headers {
@@ -231,7 +231,7 @@ fn real_main() -> Result<(), failure::Error> {
                     }
                 },
                 ("encode-sender",  Some(m)) => {
-                    let mut input = open_or_stdin(m.value_of("input"))?;
+                    let input = open_or_stdin(m.value_of("input"))?;
                     let mut output = create_or_stdout(m.value_of("output"),
                                                       force)?;
                     let tpk = TPK::from_reader(input)?;