Avoid panic on pretty string ending in single quote

Fixes #262.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/ser.rs b/src/ser.rs
index 9d989db..9f36f59 100644
--- a/src/ser.rs
+++ b/src/ser.rs
@@ -585,6 +585,10 @@ impl<'a> Serializer<'a> {
                     }
                 }
             }
+            if can_be_pretty && found_singles > 0 && value.ends_with('\'') {
+                // We cannot escape the ending quote so we must use """
+                can_be_pretty = false;
+            }
             if !can_be_pretty {
                 debug_assert!(ty != Type::OnelineTripple);
                 return Repr::Std(ty);