Better interpolated verbatim strings

We have already learned that string literals supports some variants to avoid escaping characters:

string s1 = "c:\\temp";
string s2 = @"c:\temp";
Assert.AreEqual(s1, s2);

They can also be used to improve formatting, thanks to interpolation:

var s3 = $"The path for {folder} is c:\\{folder}";

Since the introduction of interpolated strings, we have always been able to mix the two formatting styles:

var s4 = $@"The path for {folder} is c:\{folder}";
Assert.AreEqual(s3, s4);

But inverting the $ and @ characters was not possible before C# 8:

var s5 = @$"The path for {folder} is c:\{folder}";
Assert.AreEqual(s3, s5);

With this small improvement, you don't have to bother about the order of the prefixes.