yosys/tests/opt/opt_clean_init.ys

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logger -expect warning "Initial value conflict for \\y resolving to 1'0 but with init 1'1" 1
logger -expect-no-warnings
read_verilog <<EOT
module top;
(* init=1'b0 *) wire w = 1'b0;
(* init=1'bx *) wire x = 1'b0;
(* init=1'b1 *) wire y = 1'b0;
(* init=1'b0 *) wire z = 1'bx;
endmodule
EOT
clean
select -assert-count 1 a:init
select -assert-count 1 w:y a:init %i