tests/ui/async-await/issue-72442.rs

   1 // edition:2018
   2 // incremental
   3
   4 use std::fs::File;
   5 use std::future::Future;
   6 use std::io::prelude::*;
   7
   8 fn main() -> Result<(), Box<dyn std::error::Error>> {
   9     block_on(async {
  10         {
  11             let path = std::path::Path::new(".");
  12             let mut f = File::open(path.to_str())?;
  13             //~^ ERROR the trait bound
  14             let mut src = String::new();
  15             f.read_to_string(&mut src)?;
  16             Ok(())
  17         }
  18     })
  19 }
  20
  21 fn block_on<F>(f: F) -> F::Output
  22 where
  23     F: Future<Output = Result<(), Box<dyn std::error::Error>>>,
  24 {
  25     Ok(())
  26 }