Format placeholder code when generating a crate

src/cargo/ops/cargo_new.rs

@@ -12,6 +12,7 @@ use std::fmt;
 use std::fs;
 use std::io::{BufRead, BufReader, ErrorKind};
 use std::path::{Path, PathBuf};
+use std::process::Command;
 use std::str::FromStr;
 
 use toml;
@@ -707,6 +708,12 @@ mod tests {
             .unwrap_or(false)
         {
             paths::write(&path_of_source_file, default_file_content)?;
+
+            // Format the newly created source file with rustfmt
+            if let Err(e) = Command::new("rustfmt").arg(&path_of_source_file).output() {
+                let msg = format!("failed to format {}: {}", path_of_source_file.display(), e);
+                config.shell().warn(msg)?;
+            }
         }
     }