Vendor dependencies for 0.3.0 release

vendor/tracing-core/tests/macros.rs

@@ -0,0 +1,48 @@
+use tracing_core::{
+    callsite::Callsite,
+    metadata,
+    metadata::{Kind, Level, Metadata},
+    subscriber::Interest,
+};
+
+#[test]
+fn metadata_macro_api() {
+    // This test should catch any inadvertent breaking changes
+    // caused by changes to the macro.
+    struct TestCallsite;
+
+    impl Callsite for TestCallsite {
+        fn set_interest(&self, _: Interest) {
+            unimplemented!("test")
+        }
+        fn metadata(&self) -> &Metadata<'_> {
+            unimplemented!("test")
+        }
+    }
+
+    static CALLSITE: TestCallsite = TestCallsite;
+    let _metadata = metadata! {
+        name: "test_metadata",
+        target: "test_target",
+        level: Level::DEBUG,
+        fields: &["foo", "bar", "baz"],
+        callsite: &CALLSITE,
+        kind: Kind::SPAN,
+    };
+    let _metadata = metadata! {
+        name: "test_metadata",
+        target: "test_target",
+        level: Level::TRACE,
+        fields: &[],
+        callsite: &CALLSITE,
+        kind: Kind::EVENT,
+    };
+    let _metadata = metadata! {
+        name: "test_metadata",
+        target: "test_target",
+        level: Level::INFO,
+        fields: &[],
+        callsite: &CALLSITE,
+        kind: Kind::EVENT
+    };
+}