fix stable clippy::needless_collect #1238
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This fixes Clippy warnings for the latest Rust stable (1.55), where functions collect an iterator when
collect()is unnecessary.See: https://rust-lang.github.io/rust-clippy/master/index.html#needless_collect
After #1228 is merged.
However, this specific fix might not be optimal, and we should just consider to ignore Clippy here. Ref rust-lang/rust-clippy#6164 and rust-lang/rust-clippy#6909; especially in this instance, as we are collecting the iterator straight into a loop.