.	@[1 2 3];
	var x = @[1 2 3]

	var x = $(echo hi)

	var x = ${x}

	var x = "quoted ${x}"

.	var x = y + 2 * 3;
	var x = "one\ntwo\n";
	var x = [1,2,3];
	var x = [4+5, 6+7*8]

	var x = []

	var x = [x for x in y]

.	var x = @(a b);

(command.Sentence
  child: (C {(Id.Lit_Other '@') (Id.Lit_LBracket '[') (1)} {(2)} {(3) (Id.Lit_RBracket ']')})
  terminator: (Token id:Id.Op_Semi val:';' span_id:8)
)
--- @[1 2 3]

(command.VarDecl
  keyword: (Token id:Id.KW_Var val:var span_id:10)
  lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:12))]
  rhs: 
    (expr.ArrayLiteral
      left: (Token id:Id.Left_AtBracket val:'@[' span_id:16)
      items: [(Const Id.Expr_DecInt 1) (Const Id.Expr_DecInt 2) (Const Id.Expr_DecInt 3)]
    )
)
--- $(echo hi)

(command.VarDecl
  keyword: (Token id:Id.KW_Var val:var span_id:24)
  lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:26))]
  rhs: 
    (command_sub
      left_token: (Token id:Id.Left_DollarParen val:'$(' span_id:30)
      command_list: (command.CommandList children:[(C {(echo)} {(hi)})])
    )
)
--- ${x}

(command.VarDecl
  keyword: (Token id:Id.KW_Var val:var span_id:36)
  lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:38))]
  rhs: (${ Id.VSub_Name x)
)
--- "quoted ${x}"

(command.VarDecl
  keyword: (Token id:Id.KW_Var val:var span_id:46)
  lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:48))]
  rhs: (DQ ('quoted ') (${ Id.VSub_Name x))
)

(command.Sentence
  child: 
    (command.VarDecl
      keyword: (Token id:Id.KW_Var val:var span_id:0)
      lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:2))]
      rhs: 
        (expr.Binary
          op: (Token id:Id.Arith_Plus val:'+' span_id:8)
          left: (Var y)
          right: 
            (expr.Binary
              op: (Token id:Id.Arith_Star val:'*' span_id:12)
              left: (Const Id.Expr_DecInt 2)
              right: (Const Id.Expr_DecInt 3)
            )
        )
    )
  terminator: (Token id:Id.Op_Semi val:';' span_id:15)
)

(command.Sentence
  child: 
    (command.VarDecl
      keyword: (Token id:Id.KW_Var val:var span_id:17)
      lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:19))]
      rhs: (DQ (one) (Id.Lit_Other '\\') (ntwo) (Id.Lit_Other '\\') (n))
    )
  terminator: (Token id:Id.Op_Semi val:';' span_id:30)
)

(command.Sentence
  child: 
    (command.VarDecl
      keyword: (Token id:Id.KW_Var val:var span_id:32)
      lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:34))]
      rhs: 
        (expr.List
          elts: [(Const Id.Expr_DecInt 1) (Const Id.Expr_DecInt 2) (Const Id.Expr_DecInt 3)]
          ctx: expr_context.Store
        )
    )
  terminator: (Token id:Id.Op_Semi val:';' span_id:45)
)

(command.VarDecl
  keyword: (Token id:Id.KW_Var val:var span_id:47)
  lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:49))]
  rhs: 
    (expr.List
      elts: [
        (expr.Binary
          op: (Token id:Id.Arith_Plus val:'+' span_id:55)
          left: (Const Id.Expr_DecInt 4)
          right: (Const Id.Expr_DecInt 5)
        )
        (expr.Binary
          op: (Token id:Id.Arith_Plus val:'+' span_id:60)
          left: (Const Id.Expr_DecInt 6)
          right: 
            (expr.Binary
              op: (Token id:Id.Arith_Star val:'*' span_id:62)
              left: (Const Id.Expr_DecInt 7)
              right: (Const Id.Expr_DecInt 8)
            )
        )
      ]
      ctx: expr_context.Store
    )
)

(command.VarDecl
  keyword: (Token id:Id.KW_Var val:var span_id:66)
  lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:68))]
  rhs: (expr.List ctx:expr_context.Store)
)

(command.VarDecl
  keyword: (Token id:Id.KW_Var val:var span_id:75)
  lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:77))]
  rhs: 
    (expr.ListComp
      elt: (Var x)
      generators: [
        (comprehension
          lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:86))]
          iter: (Var y)
        )
      ]
    )
)

(command.Sentence
  child: 
    (command.VarDecl
      keyword: (Token id:Id.KW_Var val:var span_id:0)
      lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:2))]
      rhs: (sh_array_literal left:(Token id:Id.Left_AtParen val:'@(' span_id:6) words:[{(a)} {(b)}])
    )
  terminator: (Token id:Id.Op_Semi val:';' span_id:11)
)	var x = @('c' $'string\n');
	var x = @($(echo command) $(echo sub));
	var x = @(a b) * @($c ${d});
	var x = @(
    a
    b
    c
    );
.	var x = $(echo hi);
	var x = $(echo $(echo hi));
	var x = $(echo
hi)
    


(command.Sentence
  child: 
    (command.VarDecl
      keyword: (Token id:Id.KW_Var val:var span_id:13)
      lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:15))]
      rhs: 
        (sh_array_literal
          left: (Token id:Id.Left_AtParen val:'@(' span_id:19)
          words: [
            {(SQ (Token id:Id.Lit_Chars val:c span_id:21))}
            {
              (single_quoted
                left: (Token id:Id.Left_SingleQuoteC val:"$'" span_id:24)
                tokens: [
                  (Token id:Id.Char_Literals val:string span_id:25)
                  (Token id:Id.Char_OneChar val:'\\n' span_id:26)
                ]
              )
            }
          ]
        )
    )
  terminator: (Token id:Id.Op_Semi val:';' span_id:29)
)

(command.Sentence
  child: 
    (command.VarDecl
      keyword: (Token id:Id.KW_Var val:var span_id:31)
      lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:33))]
      rhs: 
        (sh_array_literal
          left: (Token id:Id.Left_AtParen val:'@(' span_id:37)
          words: [
            {
              (command_sub
                left_token: (Token id:Id.Left_DollarParen val:'$(' span_id:38)
                command_list: (command.CommandList children:[(C {(echo)} {(command)})])
              )
            }
            {
              (command_sub
                left_token: (Token id:Id.Left_DollarParen val:'$(' span_id:44)
                command_list: (command.CommandList children:[(C {(echo)} {(sub)})])
              )
            }
          ]
        )
    )
  terminator: (Token id:Id.Op_Semi val:';' span_id:50)
)

(command.Sentence
  child: 
    (command.VarDecl
      keyword: (Token id:Id.KW_Var val:var span_id:52)
      lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:54))]
      rhs: 
        (expr.Binary
          op: (Token id:Id.Arith_Star val:'*' span_id:64)
          left: 
            (sh_array_literal
              left: (Token id:Id.Left_AtParen val:'@(' span_id:58)
              words: [{(a)} {(b)}]
            )
          right: 
            (sh_array_literal
              left: (Token id:Id.Left_AtParen val:'@(' span_id:66)
              words: [{($ Id.VSub_DollarName '$c')} {(${ Id.VSub_Name d)}]
            )
        )
    )
  terminator: (Token id:Id.Op_Semi val:';' span_id:73)
)

(command.Sentence
  child: 
    (command.VarDecl
      keyword: (Token id:Id.KW_Var val:var span_id:75)
      lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:77))]
      rhs: 
        (sh_array_literal
          left: (Token id:Id.Left_AtParen val:'@(' span_id:81)
          words: [{(a)} {(b)} {(c)}]
        )
    )
  terminator: (Token id:Id.Op_Semi val:';' span_id:94)
)

(command.Sentence
  child: 
    (command.VarDecl
      keyword: (Token id:Id.KW_Var val:var span_id:0)
      lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:2))]
      rhs: 
        (command_sub
          left_token: (Token id:Id.Left_DollarParen val:'$(' span_id:6)
          command_list: (command.CommandList children:[(C {(echo)} {(hi)})])
        )
    )
  terminator: (Token id:Id.Op_Semi val:';' span_id:11)
)

(command.Sentence
  child: 
    (command.VarDecl
      keyword: (Token id:Id.KW_Var val:var span_id:13)
      lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:15))]
      rhs: 
        (command_sub
          left_token: (Token id:Id.Left_DollarParen val:'$(' span_id:19)
          command_list: 
            (command.CommandList
              children: [
                (C {(echo)} 
                  {
                    (command_sub
                      left_token: (Token id:Id.Left_DollarParen val:'$(' span_id:22)
                      command_list: (command.CommandList children:[(C {(echo)} {(hi)})])
                    )
                  }
                )
              ]
            )
        )
    )
  terminator: (Token id:Id.Op_Semi val:';' span_id:28)
)

(command.VarDecl
  keyword: (Token id:Id.KW_Var val:var span_id:30)
  lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:32))]
  rhs: 
    (command_sub
      l	var x = $(echo $((1+2)));
	var x = $(for i in 1 2 3; do echo $i; done);
	var x = @(a b)
.
----------------------------------------------------------------------
Ran 5 tests in 0.016s

OK
eft_token: (Token id:Id.Left_DollarParen val:'$(' span_id:36)
      command_list: (command.CommandList children:[(C {(echo)}) (C {(hi)})])
    )
)

(command.Sentence
  child: 
    (command.VarDecl
      keyword: (Token id:Id.KW_Var val:var span_id:54)
      lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:56))]
      rhs: 
        (command_sub
          left_token: (Token id:Id.Left_DollarParen val:'$(' span_id:60)
          command_list: 
            (command.CommandList
              children: [
                (C {(echo)} 
                  {
                    (word_part.ArithSub
                      anode: 
                        (arith_expr.Binary
                          op_id: Id.Arith_Plus
                          left: (arith_expr.ArithWord w:{(Id.Lit_Digits 1)})
                          right: (arith_expr.ArithWord w:{(Id.Lit_Digits 2)})
                        )
                    )
                  }
                )
              ]
            )
        )
    )
  terminator: (Token id:Id.Op_Semi val:';' span_id:70)
)

(command.Sentence
  child: 
    (command.VarDecl
      keyword: (Token id:Id.KW_Var val:var span_id:72)
      lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:74))]
      rhs: 
        (command_sub
          left_token: (Token id:Id.Left_DollarParen val:'$(' span_id:78)
          command_list: 
            (command.CommandList
              children: [
                (command.ForEach
                  iter_name: i
                  iter_words: [{(1)} {(2)} {(3)}]
                  do_arg_iter: F
                  body: 
                    (command.DoGroup
                      children: [
                        (command.Sentence
                          child: (C {(echo)} {($ Id.VSub_DollarName '$i')})
                          terminator: (Token id:Id.Op_Semi val:';' span_id:97)
                        )
                      ]
                    )
                )
              ]
            )
        )
    )
  terminator: (Token id:Id.Op_Semi val:';' span_id:101)
)

(command.VarDecl
  keyword: (Token id:Id.KW_Var val:var span_id:103)
  lhs: [(name_type name:(Token id:Id.Expr_Name val:x span_id:105))]
  rhs: (sh_array_literal left:(Token id:Id.Left_AtParen val:'@(' span_id:109) words:[{(a)} {(b)}])
)