src/parser/: Allow parsers to commit to a parse while peeking.

[sod] / src / parser / scanner-proto.lisp

diff --git a/src/parser/scanner-proto.lisp b/src/parser/scanner-proto.lisp
index 8f27f89..c6236c5 100644 (file)
--- a/src/parser/scanner-proto.lisp
+++ b/src/parser/scanner-proto.lisp
@@ -104,7 +104,7 @@
       `(let ((,place (scanner-capture-place ,scanner)))
         ,@decls
         (unwind-protect (progn ,@body)
-          (scanner-release-place ,scanner ,place))))))
+          (when ,place (scanner-release-place ,scanner ,place)))))))
 
 ;;;--------------------------------------------------------------------------
 ;;; Character scanner protocol.