yosys/tests/verilog/localparam_no_default_1.ys

logger -expect-no-warnings
read_verilog -sv <<EOF
module Module #(
    localparam X = 1
);
endmodule
EOF

design -reset

logger -expect error "localparam initialization is missing!" 1
read_verilog <<EOF
module Module #(
    localparam X
);
endmodule
EOF