Lint: Use char for single characters.

  - https://rust-lang.github.io/rust-clippy/master/index.html#single_char_pattern

  - https://rust-lang.github.io/rust-clippy/master/index.html#single_char_add_str

6 files changed, 15 insertions, 15 deletions

diff --git a/ffi-macros/src/lib.rs b/ffi-macros/src/lib.rs
index 27c6a183..29a49d85 100644
--- a/ffi-macros/src/lib.rs
+++ b/ffi-macros/src/lib.rs
@@ -67,7 +67,7 @@ pub fn cdecl(_attr: TokenStream, item: TokenStream) -> TokenStream {
     let mut cdecl = TokenStream2::new();
     doc(" # C Declaration", &mut cdecl);
     doc(" ```c", &mut cdecl);
-    for line in rust2c::rust2c(&fun).split("\n") {
+    for line in rust2c::rust2c(&fun).split('\n') {
         doc(&format!(" {}", line), &mut cdecl);
     }
     doc(" ```", &mut cdecl);
@@ -212,11 +212,11 @@ pub fn ffi_wrapper_type(args: TokenStream, input: TokenStream) -> TokenStream {
                     "name" => name = Some(value),
                     "prefix" => prefix = Some(value),
                     "derive" => {
-                        for ident in value.split(",").map(|d| d.trim()
+                        for ident in value.split(',').map(|d| d.trim()
                                                           .to_string()) {
                             let (ident, arg) =
                                 if let Some(i) = ident.find('(') {
-                                    if ! ident.ends_with(")") {
+                                    if ! ident.ends_with(')') {
                                         return syn::Error::new(
                                             mnv.path.span(),
                                             format!("missing closing \
diff --git a/openpgp/src/armor.rs b/openpgp/src/armor.rs
index 1fa3c671..7f35a804 100644
--- a/openpgp/src/armor.rs
+++ b/openpgp/src/armor.rs
@@ -1074,7 +1074,7 @@ impl<'a> Reader<'a> {
             let line = if line.ends_with(&"\r\n"[..]) {
                 // \r\n.
                 &line[..line.len() - 2]
-            } else if line.ends_with("\n") {
+            } else if line.ends_with('\n') {
                 // \n.
                 &line[..line.len() - 1]
             } else {
diff --git a/openpgp/src/fingerprint.rs b/openpgp/src/fingerprint.rs
index eba7cfa5..4fa92dc7 100644
--- a/openpgp/src/fingerprint.rs
+++ b/openpgp/src/fingerprint.rs
@@ -334,7 +334,7 @@ impl Fingerprint {
             };
 
             if !ret.is_empty() {
-                ret.push_str(" ");
+                ret.push(' ');
             }
             ret.push_str(word);
         }
diff --git a/openpgp/src/packet/userid.rs b/openpgp/src/packet/userid.rs
index e2f81a6a..49be2629 100644
--- a/openpgp/src/packet/userid.rs
+++ b/openpgp/src/packet/userid.rs
@@ -628,11 +628,11 @@ impl UserID {
             }
 
             if !value.is_empty() {
-                value.push_str(" ");
+                value.push(' ');
             }
-            value.push_str("(");
+            value.push('(');
             value.push_str(comment);
-            value.push_str(")");
+            value.push(')');
         }
 
         if check_address {
@@ -661,7 +661,7 @@ impl UserID {
         }
         value.push_str(address);
         if something {
-            value.push_str(">");
+            value.push('>');
         }
 
         if check_address {
diff --git a/sq/build.rs b/sq/build.rs
index 49d55740..07de15e0 100644
--- a/sq/build.rs
+++ b/sq/build.rs
@@ -68,7 +68,7 @@ fn dump_help(sink: &mut dyn io::Write,
         .unwrap_err().to_string();
 
     writeln!(sink, "//! ```text")?;
-    for line in help.trim_end().split("\n").skip(1) {
+    for line in help.trim_end().split('\n').skip(1) {
         if line.is_empty() {
             writeln!(sink, "//!")?;
         } else {
@@ -79,7 +79,7 @@ fn dump_help(sink: &mut dyn io::Write,
 
     // Recurse.
     let mut found_subcommands = false;
-    for subcmd in help.split("\n").filter_map(move |line| {
+    for subcmd in help.split('\n').filter_map(move |line| {
         if line == "SUBCOMMANDS:" {
             found_subcommands = true;
             None
@@ -87,7 +87,7 @@ fn dump_help(sink: &mut dyn io::Write,
             if line.chars().nth(4).map(|c| ! c.is_ascii_whitespace())
                 .unwrap_or(false)
             {
-                line.trim_start().split(" ").next()
+                line.trim_start().split(' ').next()
             } else {
                 None
             }
diff --git a/sqv/build.rs b/sqv/build.rs
index 5bcc35d5..921e71ff 100644
--- a/sqv/build.rs
+++ b/sqv/build.rs
@@ -65,7 +65,7 @@ fn dump_help(sink: &mut dyn io::Write,
         .unwrap_err().to_string();
 
     writeln!(sink, "//! ```text")?;
-    for line in help.trim_end().split("\n").skip(1) {
+    for line in help.trim_end().split('\n').skip(1) {
         if line.is_empty() {
             writeln!(sink, "//!")?;
         } else {
@@ -76,7 +76,7 @@ fn dump_help(sink: &mut dyn io::Write,
 
     // Recurse.
     let mut found_subcommands = false;
-    for subcmd in help.split("\n").filter_map(move |line| {
+    for subcmd in help.split('\n').filter_map(move |line| {
         if line == "SUBCOMMANDS:" {
             found_subcommands = true;
             None
@@ -84,7 +84,7 @@ fn dump_help(sink: &mut dyn io::Write,
             if line.chars().nth(4).map(|c| ! c.is_ascii_whitespace())
                 .unwrap_or(false)
             {
-                line.trim_start().split(" ").next()
+                line.trim_start().split(' ').next()
             } else {
                 None
             }