4 ** freeShallow: free exprData created from exprNode_effect calls.
5 ** All but the innermost storage is free'd.
8 /*@only@*/ exprData exprData_makeLiteral (/*@only@*/ cstring s);
10 /*@only@*/ exprData exprData_makeId (/*@temp@*/ uentry id);
12 /*@only@*/ exprData exprData_makePair (/*@keep@*/ exprNode a, /*@keep@*/ exprNode b);