Dedup the same version binaries

Signed-off-by: hi-rustin <rustin.liu@gmail.com>

Author: 0xPoe

src/bin/cargo/commands/install.rs

@@ -9,6 +9,7 @@ use cargo::util::IntoUrl;
 use cargo::util::ToSemver;
 use cargo::util::VersionReqExt;
 use cargo::CargoResult;
+use itertools::Itertools;
 use semver::VersionReq;
 
 use cargo_util::paths;
@@ -119,6 +120,7 @@ pub fn exec(config: &mut Config, args: &ArgMatches) -> CliResult {
         .get_many::<CrateVersion>("crate")
         .unwrap_or_default()
         .cloned()
+        .dedup_by(|x, y| x == y)
         .map(|(krate, local_version)| resolve_crate(krate, local_version, version))
         .collect::<crate::CargoResult<Vec<_>>>()?;
 

tests/testsuite/install.rs

@@ -72,12 +72,6 @@ fn install_the_same_version_twice() {
 [FINISHED] release [optimized] target(s) in [..]
 [INSTALLING] [CWD]/home/.cargo/bin/foo[EXE]
 [INSTALLED] package `foo v0.0.1` (executable `foo[EXE]`)
-[INSTALLING] foo v0.0.1
-[COMPILING] foo v0.0.1
-[FINISHED] release [optimized] target(s) in [..]
-[REPLACING] [CWD]/home/.cargo/bin/foo[EXE]
-[REPLACED] package `foo v0.0.1` with `foo v0.0.1` (executable `foo[EXE]`)
-     Summary Successfully installed foo, foo!
 [WARNING] be sure to add `[..]` to your PATH to be able to run the installed binaries
 ",
         )