==================
for tuple expression
==================

foo = [for v in ["a", "b"]: v]

---

(config_file 
  (body 
    (attribute 
      (identifier) 
      (expression 
        (expr_term 
          (for_expr 
            (for_tuple_expr 
              (for_intro 
              (identifier) 
              (expression 
                (expr_term 
                  (collection_value 
                    (tuple 
                      (expression (expr_term (literal_value (string_lit)))) 
                      (expression (expr_term (literal_value (string_lit)))))))))
              (expression (expr_term (variable_expr (identifier))))))))))) 

==================
for tuple expression with index
==================

foo = [for i, v in ["a", "b"]: i]

---

(config_file 
  (body 
    (attribute 
      (identifier) 
      (expression 
        (expr_term 
          (for_expr 
            (for_tuple_expr 
              (for_intro 
              (identifier) 
              (identifier) 
              (expression 
                (expr_term 
                  (collection_value 
                    (tuple 
                      (expression (expr_term (literal_value (string_lit)))) 
                      (expression (expr_term (literal_value (string_lit)))))))))
              (expression (expr_term (variable_expr (identifier))))))))))) 

==================
for tuple expression with predicate
==================

foo = [for i, v in ["a", "b", "c"]: v if pred(i)]

---

(config_file 
  (body 
    (attribute 
      (identifier) 
      (expression 
        (expr_term 
          (for_expr 
            (for_tuple_expr 
              (for_intro 
              (identifier) 
              (identifier) 
              (expression 
                (expr_term 
                  (collection_value 
                    (tuple 
                      (expression (expr_term (literal_value (string_lit)))) 
                      (expression (expr_term (literal_value (string_lit)))))))))
              (expression (expr_term (variable_expr (identifier))))))))))) 

==================
for object expression 
==================

foo = {for i, v in ["a", "b"]: v => i}

---

(config_file
  (body
    (attribute 
      (identifier) 
      (expression 
        (expr_term 
          (for_expr 
            (for_object_expr 
              (for_intro 
                (identifier)
                (identifier) 
                  (expression 
                    (expr_term 
                      (collection_value 
                        (tuple 
                          (expression (expr_term (literal_value (string_lit)))) 
                          (expression (expr_term (literal_value (string_lit))))))))) 
              (expression (expr_term (variable_expr (identifier)))) 
              (expression (expr_term (variable_expr (identifier))))))))))) 

==================
for object expression 2
==================

foo = {for i, v in ["a", "b"]: v => i...}

---

(config_file
  (body
    (attribute 
      (identifier) 
      (expression 
        (expr_term 
          (for_expr 
            (for_object_expr 
              (for_intro 
                (identifier)
                (identifier) 
                  (expression 
                    (expr_term 
                      (collection_value 
                        (tuple 
                          (expression (expr_term (literal_value (string_lit)))) 
                          (expression (expr_term (literal_value (string_lit))))))))) 
              (expression (expr_term (variable_expr (identifier)))) 
              (expression (expr_term (variable_expr (identifier)))) (ellipsis))))))))