Expose assert_error function

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "charred"
-version = "0.1.3"
+version = "0.1.4"
 authors = ["trivernis <trivernis@protonmail.com>"]
 edition = "2018"
 license-file = "LICENSE"

src/tapemachine.rs

@@ -173,7 +173,7 @@ impl CharTapeMachine {
     /// returns an error on the current position and optionally rewinds
     /// if a rewind index is given
     #[inline]
-    fn assert_error(&mut self, rewind_index: Option<usize>) -> TapeError {
+    pub fn assert_error(&mut self, rewind_index: Option<usize>) -> TapeError {
         if let Some(index) = rewind_index {
             self.rewind_with_error(index)
         } else {