Print environment variables for cargo run in extra verbose mode

Author: Kobzol

src/cargo/ops/cargo_run.rs

@@ -100,6 +100,10 @@ pub fn run(
     // by `compile.target_process` (the package's root directory)
     process.args(args).cwd(config.cwd());
 
+    if config.extra_verbose() {
+        process.display_env_vars();
+    }
+
     config.shell().status("Running", process.to_string())?;
 
     process.exec_replace()

tests/testsuite/run.rs

@@ -1,6 +1,8 @@
 //! Tests for the `cargo run` command.
 
-use cargo_test_support::{basic_bin_manifest, basic_lib_manifest, project, Project};
+use cargo_test_support::{
+    basic_bin_manifest, basic_lib_manifest, basic_manifest, project, Project,
+};
 use cargo_util::paths::dylib_path_envvar;
 
 #[cargo_test]
@@ -1416,6 +1418,24 @@ fn default_run_workspace() {
     p.cargo("run").with_stdout("run-a").run();
 }
 
+#[cargo_test]
+fn print_env_verbose() {
+    let p = project()
+        .file("Cargo.toml", &basic_manifest("a", "0.0.1"))
+        .file("src/main.rs", r#"fn main() {println!("run-a");}"#)
+        .build();
+
+    p.cargo("run -vv")
+        .with_stderr(
+            "\
+[COMPILING] a v0.0.1 ([CWD])
+[RUNNING] `[..]CARGO_MANIFEST_DIR=[CWD][..] rustc --crate-name a[..]`
+[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
+[RUNNING] `[..]CARGO_MANIFEST_DIR=[CWD][..] target/debug/a[EXE]`",
+        )
+        .run();
+}
+
 #[cargo_test]
 #[cfg(target_os = "macos")]
 fn run_link_system_path_macos() {