False positives in "unused" list

It seems like `program` program units are being incorrectly flagged as "unused". Is this because they are used by the linker, not by Fortran `use` statements?

No file, test, or entry point is named. Start by locating the code that builds the "unused" list and how it handles Fortran program units, then compare that logic with linker usage and Fortran use statements. Done means confirming the cause and adding coverage for program units so they are not incorrectly reported.

Written by the indexing model from the issue text.