sim: add SimValue and reading/writing more than just a scalar

crates/fayalite/tests/sim/expected/enums.vcd

@@ -9,18 +9,25 @@ $var wire 2 $ which_in $end
 $var wire 4 % data_in $end
 $var wire 2 & which_out $end
 $var wire 4 ' data_out $end
-$scope struct the_reg $end
+$scope struct b_out $end
 $var string 1 ( \$tag $end
+$scope struct HdlSome $end
+$var wire 1 ) \0 $end
+$var wire 1 * \1 $end
+$upscope $end
+$upscope $end
+$scope struct the_reg $end
+$var string 1 + \$tag $end
 $scope struct B $end
-$var reg 1 ) \0 $end
-$var reg 1 * \1 $end
+$var reg 1 , \0 $end
+$var reg 1 - \1 $end
 $upscope $end
 $scope struct C $end
 $scope struct a $end
-$var reg 1 + \[0] $end
-$var reg 1 , \[1] $end
+$var reg 1 . \[0] $end
+$var reg 1 / \[1] $end
 $upscope $end
-$var reg 2 - b $end
+$var reg 2 0 b $end
 $upscope $end
 $upscope $end
 $upscope $end
@@ -33,12 +40,15 @@ b0 $
 b0 %
 b0 &
 b0 '
-sA\x20(0) (
+sHdlNone\x20(0) (
 0)
 0*
-0+
+sA\x20(0) +
 0,
-b0 -
+0-
+0.
+0/
+b0 0
 $end
 #1000000
 1!
@@ -55,7 +65,8 @@ b1 $
 #5000000
 1!
 b1 &
-sB\x20(1) (
+sHdlSome\x20(1) (
+sB\x20(1) +
 #6000000
 0#
 b0 $
@@ -72,8 +83,10 @@ b1111 %
 b11 '
 1)
 1*
-1+
 1,
+1-
+1.
+1/
 #10000000
 0!
 #11000000
@@ -85,8 +98,11 @@ b10 $
 1!
 b10 &
 b1111 '
-sC\x20(2) (
-b11 -
+sHdlNone\x20(0) (
+0)
+0*
+sC\x20(2) +
+b11 0
 #14000000
 0!
 #15000000