* src/scan-gram.l (code_start): Always initialize it when entering

into yylex, as SC_EPILOGUE is activated *before* the corresponding
yylex invocation.  An alternative would be making it static, but
then it starts with the second %%'s beginning, instead of its end.

src/scan-gram.l

@@ -138,8 +138,9 @@ splice	 (\\[ \f\t\v]*\n)*
   /* Location of most recent identifier, when applicable.  */
   location id_loc IF_LINT (= *loc);
 
-  /* Where containing code started, when applicable.  */
-  boundary code_start IF_LINT (= loc->start);
+  /* Where containing code started, when applicable.
+     Once the second %% seen, we are looking for the epilogue.  */
+  boundary code_start = loc->end;
 
   /* Where containing comment or string or character literal started,
      when applicable.  */