Auto merge of #26513 - shunyata:master, r=alexcrichton
Auto merge of #26513 - shunyata:master, r=alexcrichton

I'm currently reading the rust book and this variable name tripped me up.
Because it was called "input", I thought at first it might contain the line
read by read_line(). This new variable name will be more instructive to rust
beginners.

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