Add a way to suppress unused-variable warnings

[catamorphism]

Sometimes, a function needs to have an argument that it doesn't use (for example, if it's passed to foldl or another higher-order function). In this case, it would be good to have a naming convention for unused arguments that would suppress the "unused variable" warning on a case-by-case basis. One example is "begin the name with an _". So fn (_x:int) {} wouldn't generate any warnings.

[pcwalton]

Note that destructuring arguments, as we discussed in Toronto, give us a
simple way to do this: just bind it to _.
On Aug 17, 2011 4:33 PM, "catamorphism" <
reply@reply.github.com>
wrote:

Sometimes, a function needs to have an argument that it doesn't use (for
example, if it's passed to foldl or another higher-order function). In
this case, it would be good to have a naming convention for unused arguments
that would suppress the "unused variable" warning on a case-by-case basis.
One example is "begin the name with an _". So fn (_x:int) {} wouldn't
generate any warnings.

Reply to this email directly or view it on GitHub:
https://github.com/graydon/rust/issues/832