fmt以及迭代器

1. std::fmt实现了输出、及其格式的各种struct\function\traits

Binary b formatting.

Debug ? formatting.

Display Format trait for an empty format, {}.

LowerExp e formatting.

LowerHex x formatting.

Octal o formatting.

Pointer p formatting.

UpperExp E formatting.

UpperHex X formatting.

Write A trait for writing or formatting into Unicode-accepting buffers or streams.

2. std::iter::Iterator 的各种方法要大体了解

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