ERROR: MixedAnyArgument - input.hack:4:29 - Argument 1 of HH\vec expects HH\Traversable<any>, any provided
ERROR: LessSpecificNestedAnyArgumentType - input.hack:6:9 - Argument 1 of foo expects shape('a' => ?vec<shape('b' => string)>), parent type shape('a' => ?vec<any>) provided