[Bug fortran/101735] Type parameter inquiries for substrings are rejected

[anlauf at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101735

--- Comment #4 from anlauf at gcc dot gnu.org ---
Created attachment 61505
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=61505&action=edit
WIP patch

This WIP patch improves the parsing of expressions with inquiry references
of substrings, but does not yet cover Tobias' examples.