fixed some reference errors

src/vcd/parse/events.rs

@@ -191,7 +191,7 @@ pub(super) fn parse_events<'a>(
                             // so that we end up storing all values
                             // of a particular signal in a consistent
                             // amount of bytes
-                            let bytes_required = signal.bytes_required()?;
+                            let bytes_required = Signal::bytes_required(num_bits, name)?;
 
                             while curr_num_bytes < bytes_required {
                                 // TODO: remove once library is known to be stable

src/vcd/parse/scopes.rs

@@ -58,6 +58,14 @@ pub(super) fn parse_var<'a>(
         | SigType::Tri1
         | SigType::Time => {
             let no_bits = word.parse::<usize>().expect(parse_err.as_str());
+            let no_bits = u16::try_from(no_bits).map_err(|_| {
+                format!(
+                    "Error near {}:{} while parsing vcd file at {cursor:?}. \
+                     This signal has {no_bits} > 2^16 - 1 bits.",
+                    file!(),
+                    line!()
+                )
+            })?;
             Some(no_bits)
         }
         // for strings, we don't really care what the number of bits is
@@ -100,7 +108,7 @@ pub(super) fn parse_var<'a>(
                 name: full_signal_name,
                 sig_type: var_type,
                 signal_error: None,
-                num_bits: None,
+                num_bits: no_bits,
                 self_idx: signal_idx,
                 nums_encoded_as_fixed_width_le_u8: vec![],
                 string_vals: vec![],