From cc6b43753be80c634775bcee4c6c5bb0ea1b10ac Mon Sep 17 00:00:00 2001
From: Weihang Lo <me@weihanglo.tw>
Date: Wed, 28 Oct 2020 02:44:59 +0800
Subject: [PATCH] feat: check cargo uninstall package opt with empty value

---
 src/bin/cargo/commands/uninstall.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/bin/cargo/commands/uninstall.rs b/src/bin/cargo/commands/uninstall.rs
index 5d989e1c9..45562c7ff 100644
--- a/src/bin/cargo/commands/uninstall.rs
+++ b/src/bin/cargo/commands/uninstall.rs
@@ -15,6 +15,14 @@ pub fn cli() -> App {
 
 pub fn exec(config: &mut Config, args: &ArgMatches<'_>) -> CliResult {
     let root = args.value_of("root");
+
+    if args.is_present_with_zero_values("package") {
+        return Err(anyhow::anyhow!(
+            "\"--package <SPEC>\" requires a SPEC format value.\n\
+            Run `cargo help pkgid` for more information about SPEC format."
+        ).into())
+    }
+
     let specs = args
         .values_of("spec")
         .unwrap_or_else(|| args.values_of("package").unwrap_or_default())