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kotlinlang

I wanted to create a nested HashMap with default values. My attempt was: 
`val map = HashMap&lt;String, HashMap&lt;String, Int&gt;&gt;().withDefault { HashMap&lt;String, Int&gt;().withDefault{ 0 } }`
 but the outer map's withDefault shows error "Cannot infer type parameter V". 
I found a better solution using `HashMap&lt;Pair&lt;String, String&gt;, Int&gt;().withDefault{ 0 }`, but I'd like to know if my first approach is possible and why what I tried doesn't work.