Fix an issue in a user-defined parameterizing rule where the caller cannot access $$ in the rule
#381
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…annot access `$$` in the rule
For example, if `printf("pair odd even:% d\n," $1); `was unable to access the pair side of` $$`with` $1`, fix this:
```
%rule pair(X, Y): X Y
{
$$ = $1 + $2;
printf("(%d, %d)\n", $1, $2);
}
;
stmt: pair(ODD, EVEN) <num> { printf("pair odd even: %d\n", $1); }
```
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For example, if
printf("pair odd even:% d\n," $1);was unable to access the pair side of$$with$1, fix this: