[a:1, "b":2, 'c': 4]
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Groovy script
  Generalized list
    PsiElement([)('[')
    Named argument
      Argument label
        PsiElement(identifier)('a')
      PsiElement(:)(':')
      Literal
        PsiElement(Integer)('1')
    PsiElement(,)(',')
    PsiWhiteSpace(' ')
    Named argument
      Argument label
        PsiElement(Gstring)('"b"')
      PsiElement(:)(':')
      Literal
        PsiElement(Integer)('2')
    PsiElement(,)(',')
    PsiWhiteSpace(' ')
    Named argument
      Argument label
        PsiElement(string)(''c'')
      PsiElement(:)(':')
      PsiWhiteSpace(' ')
      Literal
        PsiElement(Integer)('4')
    PsiElement(])(']')