--vers arg now required for yank cmd

Author: Mikastiv

src/bin/cargo/commands/yank.rs

@@ -7,7 +7,11 @@ pub fn cli() -> App {
         .about("Remove a pushed crate from the index")
         .arg(opt("quiet", "No output printed to stdout").short("q"))
         .arg(Arg::with_name("crate"))
-        .arg(opt("vers", "The version to yank or un-yank").value_name("VERSION"))
+        .arg(
+            opt("vers", "The version to yank or un-yank")
+                .value_name("VERSION")
+                .required(true),
+        )
         .arg(opt(
             "undo",
             "Undo a yank, putting a version back into the index",

src/cargo/ops/registry.rs

@@ -801,7 +801,7 @@ pub fn yank(
     };
     let version = match version {
         Some(v) => v,
-        None => bail!("a version must be specified to yank (use --vers <VERSION>)"),
+        None => bail!("a version must be specified to yank"),
     };
 
     let (mut registry, _) = registry(config, token, index, reg, true, true)?;

tests/testsuite/alt_registry.rs

@@ -637,7 +637,7 @@ Caused by:
         "owner",
         "publish",
         "search",
-        "yank",
+        "yank --vers 0.0.1",
     ] {
         p.cargo(cmd)
             .arg("--registry")