[Issue 21054] Test Suite test/run.d has no documentation on how the dmd under test is specified

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21054

moonlightsentinel at disroot.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |moonlightsentinel at disroot.o
                   |                            |rg
         Resolution|---                         |INVALID

--- Comment #1 from moonlightsentinel at disroot.org ---
run.d -v prints all relevant environment variables including `DMD`. This
varaible is documented in test/README.md as the tested compiler.

--