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Thanks, John. The relevant online documentation page is https://silverfrost.com/ftn95-help/inout/open.aspx (scroll to the bottom). I did try to search the documentation with phrases such as "tabs ...

The bug is not in INDEX(). It is in input conversion under format A. The tab characters are lost when a READ with A format is done. The character variable does not have any tab characters in it, and i ...

The following program demonstrates a bug in FTN95. When a text data file containing tab characters is read using the A format specifier, each tab is converted and expanded to a number of spaces. This ...

Here are three reasons why your program stringnew.f90 failed:
1. Your program does not search for and process tab characters (char(9)) at all.
2. In your data file, the second field contai ...

Please provide an exact copy of the data file adatac.txt .

Program source and/or data in text form, when posted in line in a user post in this and similar forums, can get mangled -- for instance, t ...

One of the undesirable consequences of using fixed size strings is having to contend with a lot of padding.

Does the following code satisfy your needs?

program xyz
implicit none
integer ...

The scoping rules in Fortran are somewhat complicated, because new facilities (contained subprograms, modules) were added piecewise over decades, while insisting on keeping old programs unaffected by ...

When an identifier appears in an expression with an argument list (with zero or more arguments), and the variable has not been declared to be an array, the identifier implicitly acquires the EXTERNAL ...

That is strange, and may be related to the exact details of your copy-paste procedure. I used Firefox on Windows to copy, and pasted by redirection to a file in a command window, and did not find any ...

Given a test program source file (fixed form) containing #include directives starting in column-1, FTN95 refuses to compile the file.

program fppbug
implicit none
#include "size. ...

In the following program, one of the variables in a COMMON block is used before it has been defined.

!
program buggy
implicit none
external blkd
integer i,j,k,l,m,n
...

There is at least one more situation where a similar spurious warning is given -- parts of expressions wherein a variable name is required by the language rules but only the type of the variable matte ...

In the following program, the first executable statement is in error because the right hand side expression is array valued, and the variable on the left is scalar.

Compiler versions 8.90 and 8.92 ...

Thanks, Paul, perhaps a better solution would be to allow that hidden flag (now accessible only to the compiler developers) to be set by the user in FTN95.cfg or as a compiler command option. As Eddie ...

Thanks for spotting the slip, Eddie. I have corrected the reproducer above.

The issue still stands. In the actual code (not the small reproducer that I posted), the common block contains hundreds o ...