Make it-expansion work when in a list (#1903)

tests/shell/pipeline/commands/internal.rs

@@ -60,6 +60,18 @@ fn proper_it_expansion() {
     })
 }
 
+#[test]
+fn it_expansion_of_list() {
+    let actual = nu!(
+        cwd: ".",
+        r#"
+            echo "foo" | echo [bar $it] | to json
+        "#
+    );
+
+    assert_eq!(actual.out, "[\"bar\",\"foo\"]");
+}
+
 #[test]
 fn argument_invocation() {
     let actual = nu!(