The 'Using Rust' part of the policy says

"Please report the version of rustc used (as R does for C, C++ and
Fortran compilers) in the installation log especially if compilation
fails, so best reported before starting compilation (as R does)."

The 'especially' part was added from bitter experience of no version
being reported on installation failure.

On our check runs

        caviarpd clarabel fangs fcl gifski hellorust rshift salso string2path
tok ymd

did not report a version, and

        fio heck timeless

only reported after a successful compilation.