syntax error on f(x)(y)

Hi! I've got this in ire:
>> a = fun(y) { fun(x) {x+y} }
=> #<Fun -toplevel/2-fun-1-:reia_eval#1293_914573_934508>
>> a(1)(2)
Error: Line 1: syntax error before: '('

[tarcieri]

I'll need to correct the function call syntax to allow you to call the result of a function call. Hooray for HOFs...