Repaired last few errors in modules and ensured compilation with QUARTUS_BUILD global flag in Quartus build settings and compiled fully (no errors other than pin assignments)

modules/assignment2.sv

@@ -65,6 +65,9 @@ module assignment2 #(width=5, ramsz=9, romsz=10) (input logic [0:0] clk);
     logic [2**width-1:0] rd_shifter;
     shifter #(width) SHIFTER (instruction[2:0], rt, rs[4:0], instruction[10:6], rd_shifter);
     
-    rd = en_alu ? rd_alu : (en_shifter ? : rd_shifter : ({(2**width){1'b0}}));
+   assign rd = en_alu
+          ? rd_alu
+          : (en_shifter ? rd_shifter : {2**width{1'b0}});
+
 endmodule
 `endif