The Verilog grammar does not allow an empty case. Most synthesis tools are quite permissive about this, but Quartus is not. This causes problems for amaranth with Quartus (see amaranth-lang/amaranth#931).
The Verilog grammar does not allow an empty case. Most synthesis tools are quite permissive about this, but Quartus is not. This causes problems for amaranth with Quartus (see amaranth-lang/amaranth#931).