Jonathan M Davis:
I don't even know the last time that I saw an unused
variable left in code (except for on purpose in something like
isInputRange).
So if the compiler warns you of unused variables, this will not
cause your code almost no warnings. No troubles for you. For
uncommon situations like isInputRange a specific annotation
solves the problem cleanly.
I'd much prefer that warning about that sort of thing be left
up to a lint-like tool.
How many C/C++ programmers do you know that use lints? I think
not enough. The Microsoft C++ compiler and Clang are adding more
and more compile-time tests, replacing lints, this a trend D
designers can't ignore. So saying "leave it to lints" it's almost
like saying "ignore the problem".
Bye,
bearophile
