grade-school, bowling: Remove unnecessary mut
#346
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The `iter_mut` yields mutable references; `frame` does not need to be mutable. Previously, because of rust-lang/rust#30280 this was not considered a warning. The fix is in rust-lang/rust#43582 This means on recently nightlies this warning is emitted.
The `or_insert` already returns a mutable reference; `entry` does not need to be mutable. Previously, because of rust-lang/rust#30280 this was not considered a warning. The fix is in rust-lang/rust#43582 This means on recently nightlies this warning is emitted.
ijanos
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Sep 1, 2017
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Let me know if my understanding of the situation is incorrect and/or I gave an incorrect explanation.