Delete unneeded imports in doc code #1202
Merged
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std::f64
used to be needed for thestd::f64::NAN
constant, but a newf64::NAN
associated constant has been stable since Rust 1.43. https://doc.rust-lang.org/std/primitive.f64.html#associatedconstant.NANstd::i128
is from #1141 and was never used.