fix tryfrom

air/src/trace/rows.rs

@@ -7,10 +7,8 @@ use vm_core::Felt;
 
 /// Represents the types of errors that can occur when converting from and into [`RowIndex`] and
 /// using its operations.
-///
-/// Currently only used during panic.
 #[derive(Debug, thiserror::Error, PartialEq, Eq)]
-enum RowIndexError<T> {
+pub enum RowIndexError<T> {
     #[error("value is too large to be converted into RowIndex: {0}")]
     InvalidSize(T),
 }
@@ -78,10 +76,10 @@ impl From<usize> for RowIndex {
 /// This function will panic if the number represented by the u64 is greater than the maximum
 /// [`RowIndex`] value, `u32::MAX`.
 impl TryFrom<u64> for RowIndex {
-    type Error = &'static str;
+    type Error = RowIndexError<u64>;
 
     fn try_from(value: u64) -> Result<Self, Self::Error> {
-        let value = u32::try_from(value).map_err(|_| RowIndexError::InvalidSize(value)).unwrap();
+        let value = u32::try_from(value).map_err(|_| RowIndexError::InvalidSize(value))?;
         Ok(RowIndex::from(value))
     }
 }