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Matthias Hausner wrote to the Dart mailing list about an upcoming break change. Matthias writes:
Time to update your code!
Tomorrow Thursday 9/27 we will eliminate support for the old raw string syntax that uses the @ prefix. The new syntax requires an r instead of the @ in front of the raw string literal.
@"..." -> r"..."
@'...' -> r'...'
@"""...""" -> r"""..."""
@'''...''' -> r'''...'''
The Dart Editor (build 12784) can perform this change automatically.
Time to update your code!