pub fn read_to_string<P: AsRef<Path>>(path: P) -> Result<String>Reads the entire contents of a file into a string.
This is a convenience function for using File::open and read_to_string with fewer imports and without an intermediate variable.
This function will return an error if path does not already exist. Other errors may also be returned according to OpenOptions::open.
If the contents of the file are not valid UTF-8, then an error will also be returned.
While reading from the file, this function handles io::ErrorKind::Interrupted with automatic retries. See io::Read documentation for details.
use std::fs;
use std::error::Error;
fn main() -> Result<(), Box<dyn Error>> {
let message: String = fs::read_to_string("message.txt")?;
println!("{}", message);
Ok(())
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