Add default_run field to Package.

Added in rust-lang/cargo#9550

src/lib.rs

@@ -345,6 +345,10 @@ pub struct Package {
     ///
     /// This is always `None` if running with a version of Cargo older than 1.39.
     pub publish: Option<Vec<String>>,
+    /// The default binary to run by `cargo run`.
+    ///
+    /// This is always `None` if running with a version of Cargo older than 1.55.
+    pub default_run: Option<String>,
 }
 
 impl Package {

tests/all/Cargo.toml

@@ -14,6 +14,7 @@ homepage = "https://github.com/oli-obk/cargo_metadata/"
 documentation = "https://docs.rs/cargo_metadata/"
 links = "foo"
 publish = false
+default-run = "otherbin"
 
 [package.metadata.docs.rs]
 all-features = true

tests/test_samples.rs

@@ -73,6 +73,7 @@ fn old_minimal() {
     assert_eq!(pkg.description, None);
     assert_eq!(pkg.license, None);
     assert_eq!(pkg.license_file, None);
+    assert_eq!(pkg.default_run, None);
     assert_eq!(pkg.dependencies.len(), 1);
     let dep = &pkg.dependencies[0];
     assert_eq!(dep.name, "somedep");
@@ -156,10 +157,10 @@ struct TestObject {
 
 #[test]
 fn all_the_fields() {
-    // All the fields currently generated as of 1.51. This tries to exercise as
+    // All the fields currently generated as of 1.55. This tries to exercise as
     // much as possible.
     let ver = cargo_version();
-    let minimum = semver::Version::parse("1.51.0").unwrap();
+    let minimum = semver::Version::parse("1.55.0").unwrap();
     if ver < minimum {
         // edition added in 1.30
         // rename added in 1.31
@@ -172,6 +173,7 @@ fn all_the_fields() {
         // documentation added in 1.49
         // doc added in 1.50
         // path added in 1.51
+        // default_run added in 1.55
         eprintln!("Skipping all_the_fields test, cargo {} is too old.", ver);
         return;
     }
@@ -202,6 +204,7 @@ fn all_the_fields() {
     assert!(all.license_file().unwrap().ends_with("tests/all/LICENSE"));
     assert_eq!(all.publish, Some(vec![]));
     assert_eq!(all.links, Some("foo".to_string()));
+    assert_eq!(all.default_run, Some("otherbin".to_string()));
 
     assert_eq!(all.dependencies.len(), 8);
     let bitflags = all