If the compiler and/or linker don't strip unused symbols, then
how on earth is
importing the module _not_ going to pull in everything in it
save for
uninitialized templates?
There are data that needs to be there, but is never
symbolically referenced, for example, the exception handler
tables. The compiler does the best it can, like emitting one
object file per function, but it always must behave
conservatively.
AFAIK, dmd used to remove unused modules but then bearophile
complained that unittests are not run for imported but otherwise
unused modules, so it looks like frontend's responsibility, not
backend's.
