mlr: cannot parse DSL expression.
Parse error on token "x" at line 20 column 5.
Please check for missing semicolon.
Expected one of:
  ; { } = > >> | ( ||= ^^= &&= ??= ???= |= &= ^= <<= >>= >>>= += .= -= *=
  /= //= %= **= ? || ^^ && =~ !=~ == != <=> >= < <= ^ & << >>> + - .+ .- *
  / // % .* ./ .// . ?? ??? ** [ [[ [[[

