Bison News
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+Changes in version 2.1b:
+
+* No user-visible changes.
+
Changes in version 2.1a, 2006-02-13:
* Bison now allows multiple %union declarations, and concatenates
their contents together.
* New warning: unused values
- Typed right-hand side symbols whose values are not used are reported,
- if the associated types have destructors. For instance:
+ Right-hand side symbols whose values are not used are reported,
+ if the symbols have destructors. For instance:
exp: exp "?" exp ":" exp { $1 ? $1 : $3; }
| exp "+" exp