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var C1 = 1;
function f(x) {
var s = "";
switch(x) {
case 0:
s += "0";
case C1:
s += "1";
}
return s;
}
assertEq(f(0), "01");
assertEq(f(1), "1");
assertEq(f(2), "");
assertEq(f(true), "");
assertEq(f(Math), "");