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) ... endwill be treated as an implicit style block. On the other hand:
always @(posedge sysclk) begin ... endwill be passed through unmodified, even though it might be semantically identical to the earlier example.