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sbool tok_doubleFor_v2_debug;
static void tok_doubleFor_v2(L tok) {
for (int i : reversed(indexesOf(tok, "for"))) {
if (neq(get(tok, i+2), "(")) continue;
int argsFrom = i+4;
int iColon = indexOfAny(tok, argsFrom, ":", ")");
if (neq(get(tok, iColon), ":")) continue;
if (tok_doubleFor_v2_debug) print("have colon");
tok_typesAndNamesOfParams_keepModifiers.set(true);
L> args = tok_typesAndNamesOfParams(subList(tok, argsFrom-1, iColon-1));
if (l(args) != 2) continue; // simple for or a three-argument for (out of this world!)
if (tok_doubleFor_v2_debug) print("have 2 args: " + sfu(args));
int iClosing = tok_findEndOfForExpression(tok, iColon+2);
if (iClosing < 0) continue;
if (tok_doubleFor_v2_debug) print("have closing");
int iCurly = iClosing+2;
if (neq(get(tok, iCurly), "{")) fail("please use { with double for");
int iCurlyEnd = findEndOfStatement(tok, iCurly)-1;
if (iCurlyEnd < 0) continue;
if (tok_doubleFor_v2_debug) print("have curly end");
// complicated expression? evaluate to variable first
S exp = trimJoinSubList(tok, iColon+2, iClosing-1);
if (!isIdentifier(exp)) {
S expVar = makeVar();
tokPrepend(tok, i, "{ final " + expVar + " = " + exp + "; ");
tokAppend(tok, iCurlyEnd, "}");
replaceTokens(tok, iColon+2, iClosing-1, expVar);
exp = expVar;
}
tokAppend(tok, iColon, " keys(");
tokPrepend(tok, iClosing, ")");
replaceTokens(tok, argsFrom, iColon-1, joinPairWithSpace(first(args)));
tokAppend(tok, iCurly, " " + joinPairWithSpace(second(args)) + " =" + exp + ".get(" + first(args).b + "); ");
reTok(tok, i, iCurlyEnd+1);
}
}