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[bison.git] / TODO

diff --git a/TODO b/TODO
index fd0d4f7084e19c4672d0e771b0dd330ecda6ee68..567e5b7365af7698412091729c4e7844ce0aa56d 100644 (file)
--- a/TODO
+++ b/TODO
@@ -45,6 +45,21 @@ this is a pleasant (but useless currently) feature, but in the future,
 I want a means to %include other bits of grammars, and _then_ it will
 be important for the various bits to define their needs in %union.
 
+When implementing multiple-%union support, bare the following in mind:
+
+- when --yacc, this must be flagged as an error.  Don't make it fatal
+  though.
+
+- The #line must now appear *inside* the definition of yystype.
+  Something like
+
+       {
+       #line 12 "foo.y"
+         int ival;
+       #line 23 "foo.y"
+         char *sval;
+       }
+
 * Coding system independence
 Paul notes: