I wrote the following code, I want to know why rustc keeps prompting me that I can’t find the method
As mentioned in the error message, you can only use methods from traits if the trait is in scope. The read_to_string method is defined by the Read trait, so you need to do use std::io::Read to be able to call that method.
The reason for this is that I might want to define my own trait that has a read_to_string method and implement it for File - if trait methods were in scope by default, these methods would collide.
Alternatively, you can call std::fs::read_to_string, which is a shortcut function for reading files to strings.
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