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* Filter the substitution list when descending into a recursive

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attribute set.
This commit is contained in:
Eelco Dolstra 2003-11-01 19:10:19 +00:00
parent 449411e511
commit a2a9bacd82
1 changed files with 14 additions and 1 deletions
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15
src/fix-ng/fix-expr.cc
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@ -97,7 +97,20 @@ ATerm substitute(Subs & subs, ATerm e)
substitute(subs2, body));
}
/* !!! Rec(...) */
/* Idem for a mutually recursive attribute set. */
ATermList bindings;
if (ATmatch(e, "Rec([<list>])", &bindings)) {
Subs subs2(subs);
ATermList bnds = bindings;
while (!ATisEmpty(bnds)) {
Expr e;
if (!ATmatch(ATgetFirst(bnds), "Bind(<str>, <term>)", &s, &e))
abort(); /* can't happen */
subs2.erase(s);
bnds = ATgetNext(bnds);
}
return ATmake("Rec(<term>)", substitute(subs2, (ATerm) bindings));
}
if (ATgetType(e) == AT_APPL) {
AFun fun = ATgetAFun(e);