Nate Nystrom

This is supported: ``` xs = [1,2,3] @match xs begin [x,y,z] => ... ... end ``` but not this: ``` xs = [1,2,3] @match xs begin Int[x,y,z] => ... ......

The following generates duplicate goto labels: ``` julia> struct Foo x; y end julia> foo(x) = x == 9 foo (generic function with 1 method) julia> @match Foo(1,2) begin Foo(_,...