1const expect = @import("std").testing.expect;
 2
 3test "error union" {
 4    var foo: anyerror!i32 = undefined;
 5
 6    // Coerce from child type of an error union:
 7    foo = 1234;
 8
 9    // Coerce from an error set:
10    foo = error.SomeError;
11
12    // Use compile-time reflection to access the payload type of an error union:
13    try comptime expect(@typeInfo(@TypeOf(foo)).error_union.payload == i32);
14
15    // Use compile-time reflection to access the error set type of an error union:
16    try comptime expect(@typeInfo(@TypeOf(foo)).error_union.error_set == anyerror);
17}
18
19// test