message: Add missing error variant
diff: @@ -201,6 +201,7 @@ pub enum Error {
  InvalidFlexibleVar,
  InvalidFunctionElim,
  InvalidRecordElim,
  + InvalidFormatRepr,
  }
  impl Error {
  @@ -210,6 +211,7 @@ impl Error {
  Error::InvalidFlexibleVar => "invalid flexible variable",
  Error::InvalidFunctionElim => "invalid function elim",
  Error::InvalidRecordElim => "invalid record elim",
  + Error::InvalidFormatRepr => "invalid format repr",
  }
  }
  }
  @@ -485,7 +487,7 @@ impl<'arena, 'env> ElimContext<'arena, 'env> {
  spine.push(Elim::FormatRepr);
  head_expr
  }
  - _ => panic_any(Error::InvalidFunctionElim),
  + _ => panic_any(Error::InvalidFormatRepr),
  }
  }
  