VITO assumes that when the keyword always is immediately followed by the keyword begin that the block is an implicit style block to be processed by VITO. For example:
always
begin
@(posedge sysclk)
...
end
will be treated as an implicit style block. On the other hand:
always @(posedge sysclk)
begin
...
end
will be passed through unmodified, even though it might be
semantically identical to the earlier example.