SOURCE_FILE
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "main"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE " "
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        WHITESPACE "\n    "
        LET_STMT
          LET_KW "let"
          WHITESPACE " "
          CONST_BLOCK_PAT
            CONST_KW "const"
            WHITESPACE " "
            BLOCK_EXPR
              STMT_LIST
                L_CURLY "{"
                WHITESPACE " "
                LITERAL
                  INT_NUMBER "15"
                WHITESPACE " "
                R_CURLY "}"
          WHITESPACE " "
          EQ "="
          WHITESPACE " "
          TUPLE_EXPR
            L_PAREN "("
            R_PAREN ")"
          SEMICOLON ";"
        WHITESPACE "\n    "
        LET_STMT
          LET_KW "let"
          WHITESPACE " "
          CONST_BLOCK_PAT
            CONST_KW "const"
            WHITESPACE " "
            BLOCK_EXPR
              STMT_LIST
                L_CURLY "{"
                WHITESPACE " "
                EXPR_STMT
                  CALL_EXPR
                    PATH_EXPR
                      PATH
                        PATH_SEGMENT
                          NAME_REF
                            IDENT "foo"
                    ARG_LIST
                      L_PAREN "("
                      R_PAREN ")"
                  SEMICOLON ";"
                WHITESPACE " "
                CALL_EXPR
                  PATH_EXPR
                    PATH
                      PATH_SEGMENT
                        NAME_REF
                          IDENT "bar"
                  ARG_LIST
                    L_PAREN "("
                    R_PAREN ")"
                WHITESPACE " "
                R_CURLY "}"
          WHITESPACE " "
          EQ "="
          WHITESPACE " "
          TUPLE_EXPR
            L_PAREN "("
            R_PAREN ")"
          SEMICOLON ";"
        WHITESPACE "\n"
        R_CURLY "}"
  WHITESPACE "\n"
