fix(update): Perform error check in clap

Author: epage

src/bin/cargo/commands/update.rs

@@ -9,10 +9,13 @@ pub fn cli() -> Command {
         .arg_quiet()
         .arg(flag("workspace", "Only update the workspace packages").short('w'))
         .arg_package_spec_simple("Package to update")
-        .arg(flag(
-            "aggressive",
-            "Force updating all dependencies of SPEC as well when used with -p",
-        ))
+        .arg(
+            flag(
+                "aggressive",
+                "Force updating all dependencies of SPEC as well when used with -p",
+            )
+            .conflicts_with("precise"),
+        )
         .arg_dry_run("Don't actually write the lockfile")
         .arg(
             opt(

tests/testsuite/update.rs

@@ -491,10 +491,14 @@ fn update_aggressive_conflicts_with_precise() {
     Package::new("serde", "0.2.2").dep("log", "0.1").publish();
 
     p.cargo("update -p serde:0.2.1 --precise 0.2.2 --aggressive")
-        .with_status(101)
+        .with_status(1)
         .with_stderr(
             "\
-error: cannot specify both aggressive and precise simultaneously
+error: the argument '--precise <PRECISE>' cannot be used with '--aggressive'
+
+Usage: cargo update --package [<SPEC>] --precise <PRECISE>
+
+For more information, try '--help'.
 ",
         )
         .run();