``` A pattern can be one of the following: an exp...

# getting-started

[Natsuki(开元米粉实力代购)]

A pattern can be one of the following:
an expression
a type test (is, !is)
a range test (in, !in)
else keyword

i think the real problem is that when use equals to test, it is implicit, not like is,in which is explicit so you can invert the result on the operator,