Fortran 2023 standard

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(stdlib_string)[string_type – Fortran-lang/stdlib] could be used as a starting point as it proposes a string_type and most of (all?) the intrinsics are overloaded for this string_type, as well as IO operations.
A stringlist_type is also provided in stdlib
Some of the questions in this thread were already discussed and implemented in stdlib. I don’t say it is the way to go, but at least it could be a good start to reflect on (and maybe to implement in @certik LFortran easily for testing)?

stdlib example:

program example_concatenate_operator
  use stdlib_stringlist_type, only: stringlist_type, operator(//)
  use stdlib_string_type, only: string_type
  implicit none

  type(stringlist_type)          :: first_stringlist, second_stringlist
  type(string_type), allocatable :: stringarray(:)

  first_stringlist = first_stringlist//"Element No. one"
! first_stringlist <-- {"Element No. one"}

  second_stringlist = string_type("Element No. two")//first_stringlist
! second_stringlist <-- {Element No. two, "Element No. one"}

!> Creating an array of 2 string_type elements
  stringarray = [string_type("Element No. three"), string_type("Element No. four")]

  second_stringlist = first_stringlist//stringarray
! second_stringlist <-- {"Element No. one", "Element No. three", "Element No. four"}

  second_stringlist = ["#1", "#2"]//second_stringlist
! second_stringlist <-- {"#1", "#2", "Element No. one", "Element No. three", "Element No. four"}

  first_stringlist = first_stringlist//second_stringlist
! first_stringlist <-- {"Element No. one", "#1", "#2", "Element No. one", "Element No. three", "Element No. four"}

end program example_concatenate_operator
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