1 files changed, 8 insertions, 0 deletions
diff --git a/src/sexp/step.rs b/src/sexp/step.rs
index 765e33c..1ab0291 100644
--- a/src/sexp/step.rs
+++ b/src/sexp/step.rs
@@ -209,4 +209,12 @@ impl SExp {
             t => Err(format!("unimplemented: {:?}.step()", t)),
         }
     }
+
+
+    pub fn multistep(self) -> Result<Self, String> {
+        match self.clone().step()? {
+            x if x == self => Ok(self),
+            x => x.multistep()
+        }
+    }
 }