2 let ok = "{{everything fine}}";
3 let bad = "\{it is wrong\}";
4 //~^ ERROR unknown character escape: {
5 //~^^ HELP if used in a formatting string, curly braces are escaped with `{{` and `}}`
6 //~^^^ ERROR unknown character escape: }
7 //~^^^^ HELP if used in a formatting string, curly braces are escaped with `{{` and `}}`