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

crates/nu-protocol/src/hir.rs

@@ -567,6 +567,14 @@ impl SpannedExpression {
             }
             Expression::Variable(Variable::It(_)) => true,
             Expression::Path(path) => path.head.has_shallow_it_usage(),
+            Expression::List(list) => {
+                for l in list {
+                    if l.has_shallow_it_usage() {
+                        return true;
+                    }
+                }
+                false
+            }
             Expression::Invocation(block) => {
                 for commands in block.block.iter() {
                     for command in commands.list.iter() {

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!(