Verilator

The following causes a syntax error:

always @(*)
  y = #4 'h1;

The error message is:

$ %Error: t/t_delayed_unsigned_const.v:23: syntax error, unexpected ';', expecting TYPE-IDENTIFIER
%Error: Exiting due to 1 warning(s)
%Error: Command Failed /home/jeremy/tools/verilator/verilator/verilator_bin --prefix Vt_delayed_unsigned_const --x-assign unique -cc -Mdir obj_dir/t_delayed_unsigned_const --debug-check -f input.vc t/t_delayed_unsigned_const.v

There is an easy workaround (put in the size).

Regression test case attached. Tested with Verilator 3.824.