1comptime {
 2    const a = "foo";
 3    if (a != "foo") unreachable;
 4}
 5comptime {
 6    const a = "foo";
 7    if (a == "foo") {} else unreachable;
 8}
 9comptime {
10    const a = "foo";
11    if (a != ("foo")) {} // intentionally allow
12    if (a == ("foo")) {} // intentionally allow
13}
14comptime {
15    const a = "foo";
16    switch (a) {
17        "foo" => {},
18        else => unreachable,
19    }
20}
21comptime {
22    const a = "foo";
23    switch (a) {
24        ("foo") => {}, // intentionally allow
25        else => {},
26    }
27}
28
29// error
30//
31// :3:11: error: cannot compare strings with !=
32// :7:11: error: cannot compare strings with ==
33// :17:9: error: cannot switch on strings