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PR07: Test the parsing of == and += in macro definitions.
Trip the parser so we don't get any further.
@>
1. Test with no equals.
@$@<Sloth@>@{No equals in this macro definition.@}
2. Test with ==.
@$@<Sloth with equals@>==@{No equals in this macro definition.@}
3. Test with +=.
@$@<Sloth with plus@>+=@{No equals in this macro definition.@}
4. Test with syntax errors.
@$@<Error1@>++@{No equals in this macro definition.@}
@A@<Error recovery point@>
@$@<Error2@>@+=@{No equals in this macro definition.@}
@A@<Error recovery point@>
@$@<Error3@>+==+@{No equals in this macro definition.@}
@A@<Error recovery point@>
@$@<Error4@>=+@{No equals in this macro definition.@}
@A@<Error recovery point@>
@$@<Error4@>@=@=@{No equals in this macro definition.@}
@A@<Error recovery point@>
@$@<Error4@>@+@=@{No equals in this macro definition.@}
@A@<Error recovery point@>
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