remove extraneous explicit unsigned in params (resolves #47)

src/Convert/Unsigned.hs

@@ -21,6 +21,7 @@ convert =
     traverseTypes convertType
 
 convertType :: Type -> Type
+convertType (Implicit        Unsigned rs) = Implicit        Unspecified rs
 convertType (IntegerVector t Unsigned rs) = IntegerVector t Unspecified rs
 convertType (Net           t Unsigned rs) = Net           t Unspecified rs
 convertType other = other

test/basic/unsigned.sv

@@ -4,4 +4,8 @@ module top;
         for (int unsigned i = 0; i < 4; i++)
             arr[i] = i;
     initial $display(arr);
+
+    parameter unsigned foo = 1;
+    localparam unsigned bar = 1;
+    initial $display(foo, bar);
 endmodule

test/basic/unsigned.v

@@ -6,4 +6,8 @@ module top;
             arr[i] = i;
     end
     initial $display(arr);
+
+    parameter foo = 1;
+    localparam bar = 1;
+    initial $display(foo, bar);
 endmodule