# Possible gfortran bug?

**URL:** <https://fortran-lang.discourse.group/t/possible-gfortran-bug/10579>\
**Category:** Help\
**Created:** [December 28, 2025, 10:03pm UTC](https://fortran-lang.discourse.group/t/possible-gfortran-bug/10579 "2025-12-28T22:03:54Z")\
**Posts on this page:** 1\
**Showing post:** 14

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**Author:** ![RonShepard](https://avatars.discourse-cdn.com/v4/letter/r/a3d4f5/32.png) [@RonShepard](https://fortran-lang.discourse.group/u/RonShepard)\
**Post date:** [December 30, 2025, 2:39am UTC](https://fortran-lang.discourse.group/t/possible-gfortran-bug/10579/14 "2025-12-30T02:39:51Z")

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> [@msz59](#):
>
> It **is** a recursive I/O. The last line of the main program is

My mistake then. That print statement within `join()` was commented out, and I thought the error persisted nonetheless.

The previous discussion about a program that hangs, but does not have explicit recursive i/o was here. [Execute\_command\_line problem - #3 by RonShepard](https://fortran-lang.discourse.group/t/execute-command-line-problem/7151/3) That program involved some kind odd interaction between character concatenation operations and the `execute_command_line()` intrinsic. I don’t think that issue was fully resolved.

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