a+b
(double)(int) 5L
-----
Groovy script
  Additive expression
    Reference expression
      PsiElement(identifier)('a')
    PsiElement(+)('+')
    Reference expression
      PsiElement(identifier)('b')
  PsiElement(new line)('\n')
  Typecast expression
    PsiElement(()('(')
    Built in type
      PsiElement(double)('double')
    PsiElement())(')')
    Typecast expression
      PsiElement(()('(')
      Built in type
        PsiElement(int)('int')
      PsiElement())(')')
      PsiWhiteSpace(' ')
      Literal
        PsiElement(Long)('5L')