FILE
  RsFunctionImpl(FUNCTION)
    PsiElement(fn)('fn')
    PsiWhiteSpace(' ')
    PsiElement(identifier)('main')
    RsValueParameterListImpl(VALUE_PARAMETER_LIST)
      PsiElement(()('(')
      PsiElement())(')')
    PsiWhiteSpace(' ')
    RsBlockImpl(BLOCK)
      PsiElement({)('{')
      PsiWhiteSpace('\n    ')
      RsExprStmtImpl(EXPR_STMT)
        RsBinaryExprImpl(BINARY_EXPR)
          RsBinaryExprImpl(BINARY_EXPR)
            RsPathExprImpl(PATH_EXPR)
              RsPathImpl(PATH)
                PsiElement(identifier)('a')
            RsBinaryOpImpl(BINARY_OP)
              PsiElement(-)('-')
            RsUnaryExprImpl(UNARY_EXPR)
              PsiElement(-)('-')
              PsiErrorElement:'#', '::', <, <block expr>, <expr>, <for expr>, <loop expr>, <macro call>, <struct literal>, <while expr>, identifier or '|' expected, got '<'
                <empty list>
          PsiWhiteSpace(' ')
          RsBinaryOpImpl(BINARY_OP)
            PsiElement(<)('<')
          PsiWhiteSpace(' ')
          RsPathExprImpl(PATH_EXPR)
            RsPathImpl(PATH)
              PsiElement(identifier)('n')
        PsiElement(;)(';')
      PsiWhiteSpace('\n    ')
      RsExprStmtImpl(EXPR_STMT)
        RsBinaryExprImpl(BINARY_EXPR)
          RsPathExprImpl(PATH_EXPR)
            RsPathImpl(PATH)
              PsiElement(identifier)('a')
          RsBinaryOpImpl(BINARY_OP)
            PsiElement(-)('-')
          PsiWhiteSpace(' ')
          RsUnaryExprImpl(UNARY_EXPR)
            PsiElement(-)('-')
            PsiErrorElement:<expr> expected, got ';'
              <empty list>
        PsiElement(;)(';')
      PsiWhiteSpace('\n    ')
      RsExprStmtImpl(EXPR_STMT)
        RsUnaryExprImpl(UNARY_EXPR)
          PsiElement(-)('-')
          PsiWhiteSpace(' ')
          RsUnaryExprImpl(UNARY_EXPR)
            PsiElement(-)('-')
            RsPathExprImpl(PATH_EXPR)
              RsPathImpl(PATH)
                PsiElement(identifier)('a')
        PsiElement(;)(';')
      PsiWhiteSpace('\n    ')
      RsExprStmtImpl(EXPR_STMT)
        RsBinaryExprImpl(BINARY_EXPR)
          RsBinaryExprImpl(BINARY_EXPR)
            RsPathExprImpl(PATH_EXPR)
              RsPathImpl(PATH)
                PsiElement(identifier)('a')
            RsBinaryOpImpl(BINARY_OP)
              PsiElement(+)('+')
            PsiErrorElement:<expr> expected, got '+'
              <empty list>
          PsiWhiteSpace(' ')
          RsBinaryOpImpl(BINARY_OP)
            PsiElement(+)('+')
          PsiErrorElement:<expr> expected, got ';'
            <empty list>
        PsiElement(;)(';')
      PsiErrorElement:<item> or <statement> expected, got '+'
        <empty list>
      PsiWhiteSpace('\n    ')
      PsiElement(+)('+')
      PsiWhiteSpace(' ')
      PsiElement(+)('+')
      PsiElement(identifier)('a')
      PsiElement(;)(';')
      PsiWhiteSpace('\n')
      PsiElement(})('}')
