mirror of https://github.com/rust-lang/rust
27 lines
570 B
Rust
27 lines
570 B
Rust
//@ edition:2018
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//@ incremental
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use std::fs::File;
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use std::future::Future;
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use std::io::prelude::*;
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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block_on(async {
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{
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let path = std::path::Path::new(".");
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let mut f = File::open(path.to_str())?;
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//~^ ERROR the trait bound
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let mut src = String::new();
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f.read_to_string(&mut src)?;
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Ok(())
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}
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})
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}
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fn block_on<F>(f: F) -> F::Output
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where
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F: Future<Output = Result<(), Box<dyn std::error::Error>>>,
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{
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Ok(())
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}
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