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Comment by boywitharupee | Hacker News Reader

For unused vars you can do this and the compiler will ignore it.

_ = my_unsed_var;

Doesn't that entirely defeat the purpose of having the compiler not allow unused variables.

Not exactly. Because a quick grep of _ = gives you the variables which are needed to be checked before whether used or unused

Add a pre-commit hook to forbid use of '_ ='.

   grep '$ *_ ?=' *