refactor: Resolve clap deprecations

src/bin/cargo/commands/bench.rs

@@ -3,7 +3,6 @@ use cargo::ops::{self, TestOptions};
 
 pub fn cli() -> Command {
     subcommand("bench")
-        .trailing_var_arg(true)
         .about("Execute all benchmarks of a local package")
         .arg_quiet()
         .arg(
@@ -14,7 +13,8 @@ pub fn cli() -> Command {
         .arg(
             Arg::new("args")
                 .help("Arguments for the bench binary")
-                .num_args(0..),
+                .num_args(0..)
+                .trailing_var_arg(true),
         )
         .arg_targets_all(
             "Benchmark only this package's library",

src/bin/cargo/commands/run.rs

@@ -8,13 +8,13 @@ pub fn cli() -> Command {
     subcommand("run")
         // subcommand aliases are handled in aliased_command()
         // .alias("r")
-        .trailing_var_arg(true)
         .about("Run a binary or example of the local package")
         .arg_quiet()
         .arg(
             Arg::new("args")
                 .value_parser(value_parser!(std::ffi::OsString))
-                .num_args(0..),
+                .num_args(0..)
+                .trailing_var_arg(true),
         )
         .arg_targets_bin_example(
             "Name of the bin target to run",

src/bin/cargo/commands/rustc.rs

@@ -7,10 +7,14 @@ const CRATE_TYPE_ARG_NAME: &str = "crate-type";
 
 pub fn cli() -> Command {
     subcommand("rustc")
-        .trailing_var_arg(true)
         .about("Compile a package, and pass extra options to the compiler")
         .arg_quiet()
-        .arg(Arg::new("args").num_args(0..).help("Rustc flags"))
+        .arg(
+            Arg::new("args")
+                .num_args(0..)
+                .help("Rustc flags")
+                .trailing_var_arg(true),
+        )
         .arg_package("Package to build")
         .arg_jobs()
         .arg_targets_all(

src/bin/cargo/commands/rustdoc.rs

@@ -4,10 +4,9 @@ use crate::command_prelude::*;
 
 pub fn cli() -> Command {
     subcommand("rustdoc")
-        .trailing_var_arg(true)
         .about("Build a package's documentation, using specified custom flags.")
         .arg_quiet()
-        .arg(Arg::new("args").num_args(0..))
+        .arg(Arg::new("args").num_args(0..).trailing_var_arg(true))
         .arg(flag(
             "open",
             "Opens the docs in a browser after the operation",

src/bin/cargo/commands/test.rs

@@ -5,7 +5,6 @@ pub fn cli() -> Command {
     subcommand("test")
         // Subcommand aliases are handled in `aliased_command()`.
         // .alias("t")
-        .trailing_var_arg(true)
         .about("Execute all unit and integration tests and build examples of a local package")
         .arg(
             Arg::new("TESTNAME")
@@ -15,7 +14,8 @@ pub fn cli() -> Command {
         .arg(
             Arg::new("args")
                 .help("Arguments for the test binary")
-                .num_args(0..),
+                .num_args(0..)
+                .trailing_var_arg(true),
         )
         .arg(
             flag(