1export fn foo() void {
 2    if (2 == undefined) {}
 3}
 4
 5export fn bar(x: u32) void {
 6    if (x == undefined) {}
 7}
 8
 9// error
10//
11// :2:11: error: use of undefined value here causes illegal behavior
12// :6:11: error: use of undefined value here causes illegal behavior