Clippy fixes for Rust 1.58 (#733)

* Clippy fixes for Rust 1.58

* Try different message

crates/nu-command/src/dataframe/values/nu_dataframe/operations.rs

@@ -196,7 +196,7 @@ impl NuDataFrame {
                 let df_new = DataFrame::new(new_cols).map_err(|e| {
                     ShellError::SpannedLabeledError(
                         "Error appending dataframe".into(),
-                        format!("Unable to append dataframes: {}", e.to_string()),
+                        format!("Unable to append dataframes: {}", e),
                         span,
                     )
                 })?;

crates/nu-command/src/filters/empty.rs

@@ -162,7 +162,7 @@ fn process_row(
                 }
             } else {
                 let mut obj = input.clone();
-                for column in column_paths.clone() {
+                for column in column_paths {
                     let path = column.into_string();
                     let data = input.get_data_by_key(&path);
                     let is_empty = match data {

crates/nu-command/src/filters/flatten.rs

@@ -153,7 +153,7 @@ fn flat_value(columns: &[CellPath], item: &Value, _name_tag: Span) -> Vec<Value>
 
                         for (k, v) in cols.into_iter().zip(vals.into_iter()) {
                             if out.contains_key(&k) {
-                                out.insert(format!("{}_{}", column.to_string(), k), v.clone());
+                                out.insert(format!("{}_{}", column, k), v.clone());
                             } else {
                                 out.insert(k, v.clone());
                             }

crates/nu-command/src/platform/ansi/command.rs

@@ -389,7 +389,7 @@ Format: #
                     "attr" => nu_style.attr = Some(v.as_string()?),
                     _ => {
                         return Err(ShellError::IncompatibleParametersSingle(
-                            format!("problem with key: {}", k.to_string()),
+                            format!("problem with key: {}", k),
                             code.span().expect("error with span"),
                         ))
                     }

crates/nu-command/src/platform/ansi/gradient.rs

@@ -275,7 +275,7 @@ fn action(
             }
         }
         other => {
-            let got = format!("value is {}, not string", other.get_type().to_string());
+            let got = format!("value is {}, not string", other.get_type());
 
             Value::Error {
                 error: ShellError::TypeMismatch(got, other.span().unwrap_or(*command_span)),

crates/nu-command/src/platform/ansi/strip.rs

@@ -90,7 +90,7 @@ fn action(input: &Value, command_span: &Span) -> Value {
             Value::string(stripped_string, *span)
         }
         other => {
-            let got = format!("value is {}, not string", other.get_type().to_string());
+            let got = format!("value is {}, not string", other.get_type());
 
             Value::Error {
                 error: ShellError::TypeMismatch(got, other.span().unwrap_or(*command_span)),

crates/nu-command/src/platform/kill.rs

@@ -111,7 +111,7 @@ impl Command for Kill {
                 }
                 cmd.arg("-9");
             } else if let Some(signal_value) = signal {
-                cmd.arg(format!("-{}", signal_value.item.to_string()));
+                cmd.arg(format!("-{}", signal_value.item));
             }
 
             cmd.arg(pid.to_string());

crates/nu-command/src/viewers/griddle.rs

@@ -193,11 +193,7 @@ fn create_grid_output(
                         .unwrap_or_default();
                     // eprintln!("ansi_style: {:?}", &ansi_style);
 
-                    let item = format!(
-                        "{} {}",
-                        icon_style.apply(icon).to_string(),
-                        ansi_style.apply(value).to_string()
-                    );
+                    let item = format!("{} {}", icon_style.apply(icon), ansi_style.apply(value));
 
                     let mut cell = Cell::from(item);
                     cell.alignment = Alignment::Left;

crates/nu-protocol/src/ty.rs

@@ -44,7 +44,7 @@ impl Display for Type {
                 "record<{}>",
                 fields
                     .iter()
-                    .map(|(x, y)| format!("{}: {}", x, y.to_string()))
+                    .map(|(x, y)| format!("{}: {}", x, y))
                     .collect::<Vec<String>>()
                     .join(", "),
             ),

crates/nu_plugin_inc/src/inc.rs

@@ -92,11 +92,7 @@ impl Inc {
             x => {
                 let msg = x.as_string().map_err(|e| LabeledError {
                     label: "Unable to extract string".into(),
-                    msg: format!(
-                        "value cannot be converted to string {:?} - {}",
-                        x,
-                        e.to_string()
-                    ),
+                    msg: format!("value cannot be converted to string {:?} - {}", x, e),
                     span: Some(head),
                 })?;
 

src/tests.rs

@@ -76,7 +76,7 @@ pub fn fail_test(input: &str, expected: &str) -> TestResult {
 #[cfg(test)]
 pub fn not_found_msg() -> &'static str {
     if cfg!(windows) {
-        "cannot find"
+        "not found"
     } else {
         "No such"
     }