Add an alias denylist for expansions (#4871)

tests/shell/pipeline/commands/internal.rs

@@ -581,6 +581,17 @@ fn block_params_override() {
     assert!(actual.err.contains("variable not found"));
 }
 
+#[test]
+fn alias_reuse() {
+    let actual = nu!(
+        cwd: ".",
+        r#"alias foo = echo bob; foo; foo"#
+    );
+
+    assert!(actual.out.contains("bob"));
+    assert!(actual.err.is_empty());
+}
+
 #[test]
 fn block_params_override_correct() {
     let actual = nu!(