yosys/docs/source/code_examples/show/splice.v

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module splice_demo(a, b, c, d, e, f, x, y);
input [1:0] a, b, c, d, e, f;
output [1:0] x = {a[0], a[1]};
output [11:0] y;
assign {y[11:4], y[1:0], y[3:2]} =
{a, b, -{c, d}, ~{e, f}};
endmodule