Add d as an alias for doc

src/bin/cargo/cli.rs

@@ -319,7 +319,7 @@ Some common cargo commands are (see all commands with --list):
     build, b    Compile the current package
     check, c    Analyze the current package and report errors, but don't build object files
     clean       Remove the target directory
-    doc         Build this package's and its dependencies' documentation
+    doc, d      Build this package's and its dependencies' documentation
     new         Create a new cargo package
     init        Create a new cargo package in an existing directory
     run, r      Run a binary or example of the local package

src/bin/cargo/commands/doc.rs

@@ -4,6 +4,8 @@ use cargo::ops::{self, DocOptions};
 
 pub fn cli() -> App {
     subcommand("doc")
+        // subcommand aliases are handled in aliased_command()
+        // .alias("d")
         .about("Build a package's documentation")
         .arg(opt("quiet", "No output printed to stdout").short("q"))
         .arg(opt(

src/bin/cargo/main.rs

@@ -48,9 +48,10 @@ fn main() {
 
 /// Table for defining the aliases which come builtin in `Cargo`.
 /// The contents are structured as: `(alias, aliased_command, description)`.
-const BUILTIN_ALIASES: [(&str, &str, &str); 4] = [
+const BUILTIN_ALIASES: [(&str, &str, &str); 5] = [
     ("b", "build", "alias: build"),
     ("c", "check", "alias: check"),
+    ("d", "doc", "alias: doc"),
     ("r", "run", "alias: run"),
     ("t", "test", "alias: test"),
 ];

src/doc/src/reference/config.md

@@ -252,6 +252,7 @@ subcommand and arguments. The following aliases are built-in to Cargo:
 [alias]
 b = "build"
 c = "check"
+d = "doc"
 t = "test"
 r = "run"
 ```