src/test/ui/fmt/format-string-error.rs

   1 // Copyright 2016 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 fn main() {
  12     println!("{");
  13     println!("{{}}");
  14     println!("}");
  15     let _ = format!("{_foo}", _foo = 6usize);
  16     //~^ ERROR invalid format string: invalid argument name `_foo`
  17     let _ = format!("{_}", _ = 6usize);
  18     //~^ ERROR invalid format string: invalid argument name `_`
  19     let _ = format!("{");
  20     //~^ ERROR invalid format string: expected `'}'` but string was terminated
  21     let _ = format!("}");
  22     //~^ ERROR invalid format string: unmatched `}` found
  23     let _ = format!("{\\}");
  24     //~^ ERROR invalid format string: expected `'}'`, found `'\\'`
  25 }