diff --git a/maraiah/cenum.rs b/maraiah/cenum.rs
index d17dca4..120d624 100644
--- a/maraiah/cenum.rs
+++ b/maraiah/cenum.rs
@@ -57,7 +57,7 @@ macro_rules! c_enum
          {
             match n {
                $($va => Ok($t::$en),)+
-               n => Err(Self::Error::new(n))
+               n => Err(Self::Error::new(stringify!($t), n))
             }
          }
       }
diff --git a/maraiah/defl.rs b/maraiah/defl.rs
index d13f2b1..cd5bc7c 100644
--- a/maraiah/defl.rs
+++ b/maraiah/defl.rs
@@ -413,7 +413,7 @@ impl HuffmanTable
          code  <<= 1;
       }
 
-      Err(repr_error(code))
+      Err(ReprError::new("DEFLATE code", code).into())
    }
 }
 
diff --git a/maraiah/err.rs b/maraiah/err.rs
index 910dc7e..a6bc647 100644
--- a/maraiah/err.rs
+++ b/maraiah/err.rs
@@ -15,9 +15,13 @@ macro_rules! ok {
 
 macro_rules! flag_ok {
    ($t:ident$(::$tc:ident)*, $v:expr) => {
-      match $t$(::$tc)*::from_bits($v) {
-         Some(v) => Ok(v),
-         None    => Err($crate::err::err_msg(concat!("bad ", stringify!($t)))),
+      {
+         let v = $v;
+
+         match $t$(::$tc)*::from_bits(v) {
+            Some(v) => Ok(v),
+            None    => Err($crate::err::ReprError::new(stringify!($t), v)),
+         }
       }
    };
 }
@@ -40,33 +44,22 @@ macro_rules! bail {
 /// ```
 pub fn err_msg(msg: &'static str) -> Error {ErrMsg(msg).into()}
 
-/// Returns an `Error` from a `ReprError`.
-///
-/// # Examples
-///
-/// ```
-/// use maraiah::err::repr_error;
-///
-/// assert_eq!(format!("{}", repr_error(77)),
-///            "representation error (got 77)");
-/// ```
-pub fn repr_error<T: Into<i64>>(n: T) -> Error {ReprError::new(n).into()}
-
 impl ReprError
 {
-   /// Creates a new `ReprError`.
+   /// Returns an `Error` with a message for representation errata.
    ///
    /// # Examples
    ///
    /// ```
-   /// use maraiah::err::ReprError;
+   /// use maraiah::err::repr_error;
    ///
-   /// let err = ReprError::new(7);
-   ///
-   /// assert_eq!(format!("{}", err), "representation error (got 7)");
+   /// assert_eq!(format!("{}", repr_error("TypeName", 77)),
+   ///            "bad TypeName (77)");
    /// ```
-   #[inline]
-   pub fn new<T: Into<i64>>(n: T) -> Self {Self(n.into())}
+   pub fn new<T: Into<i64>>(t: &'static str, n: T) -> Self
+   {
+      Self(t, n.into())
+   }
 }
 
 impl Fail for ReprError {}
@@ -76,7 +69,7 @@ impl fmt::Display for ReprError
 {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
    {
-      write!(f, "representation error (got {})", self.0)
+      write!(f, "bad {} ({})", self.0, self.1)
    }
 }
 
@@ -90,7 +83,7 @@ impl fmt::Display for ErrMsg
 
 /// A representation error for an integer.
 #[derive(Debug, Eq, Ord, PartialEq, PartialOrd)]
-pub struct ReprError(i64);
+pub struct ReprError(&'static str, i64);
 
 #[derive(Debug)]
 struct ErrMsg(&'static str);
diff --git a/maraiah/map/poly.rs b/maraiah/map/poly.rs
index c928537..f543dd3 100644
--- a/maraiah/map/poly.rs
+++ b/maraiah/map/poly.rs
@@ -94,7 +94,7 @@ impl PolygonType
          21 => Ok(PolygonType::Glue),
          22 => Ok(PolygonType::GlueTrigger(pdata)),
          23 => Ok(PolygonType::GlueSuper),
-         n  => Err(ReprError::new(n)),
+         n  => Err(ReprError::new("PolygonType", n)),
       }
    }
 
@@ -118,7 +118,7 @@ impl PolygonType
          13 => Ok(PolygonType::GlueSuper),
          14 => Ok(PolygonType::MustExplore),
          15 => Ok(PolygonType::AutoExit),
-         n  => Err(ReprError::new(n)),
+         n  => Err(ReprError::new("PolygonType", n)),
       }
    }
 }
diff --git a/maraiah/map/trmg.rs b/maraiah/map/trmg.rs
index 8289feb..1486a40 100644
--- a/maraiah/map/trmg.rs
+++ b/maraiah/map/trmg.rs
@@ -35,7 +35,7 @@ pub fn read(b: &[u8]) -> ResultS<(InterGroup, usize)>
       14 => GroupType::Camera(pdata),
       15 => GroupType::Static(pdata),
       16 => GroupType::Tag(pdata),
-      n  => return Err(ReprError::new(n).into()),
+      n  => return Err(ReprError::new("GroupType", n).into()),
    };
 
    Ok((InterGroup{flags, ttype, lines, beg, len}, 12))