unnecessary_raw_strings

Unnecessary use of a raw string.

The analyzer produces this diagnostic when a string literal is marked as being raw (is prefixed with an r), but making the string raw doesn't change the value of the string.

The following code produces this diagnostic because the string literal will have the same value without the r as it does with the r:

var s = r'abc';

Remove the r in front of the string literal:

var s = 'abc';

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