src/tools/clippy/tests/ui/write_literal_2.rs

   1 //@no-rustfix: overlapping suggestions
   2 #![allow(unused_must_use)]
   3 #![warn(clippy::needless_raw_strings, clippy::write_literal)]
   4
   5 use std::io::Write;
   6
   7 fn main() {
   8     let mut v = Vec::new();
   9
  10     writeln!(v, "{}", "{hello}");
  11     //~^ ERROR: literal with an empty format string
  12     //~| NOTE: `-D clippy::write-literal` implied by `-D warnings`
  13     writeln!(v, r"{}", r"{hello}");
  14     //~^ ERROR: unnecessary raw string literal
  15     //~| NOTE: `-D clippy::needless-raw-strings` implied by `-D warnings`
  16     //~| ERROR: literal with an empty format string
  17     writeln!(v, "{}", '\'');
  18     //~^ ERROR: literal with an empty format string
  19     writeln!(v, "{}", '"');
  20     //~^ ERROR: literal with an empty format string
  21     writeln!(v, r"{}", '"');
  22     //~^ ERROR: literal with an empty format string
  23     writeln!(v, r"{}", '\'');
  24     //~^ ERROR: literal with an empty format string
  25     writeln!(
  26         v,
  27         "some {}",
  28         "hello \
  29         //~^ ERROR: literal with an empty format string
  30         world!"
  31     );
  32     writeln!(
  33         v,
  34         "some {}\
  35         {} \\ {}",
  36         "1",
  37         "2",
  38         "3",
  39         //~^ ERROR: literal with an empty format string
  40     );
  41     writeln!(v, "{}", "\\");
  42     //~^ ERROR: literal with an empty format string
  43     writeln!(v, r"{}", "\\");
  44     //~^ ERROR: literal with an empty format string
  45     writeln!(v, r#"{}"#, "\\");
  46     //~^ ERROR: literal with an empty format string
  47     writeln!(v, "{}", r"\");
  48     //~^ ERROR: literal with an empty format string
  49     writeln!(v, "{}", "\r");
  50     //~^ ERROR: literal with an empty format string
  51     // hard mode
  52     writeln!(v, r#"{}{}"#, '#', '"');
  53     //~^ ERROR: literal with an empty format string
  54     //~| ERROR: literal with an empty format string
  55     // should not lint
  56     writeln!(v, r"{}", "\r");
  57 }