zig/test/cases/switch_prong_err_enum.zig

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611 B
Zig

const assert = @import("std").debug.assert;
var read_count: u64 = 0;
fn readOnce() error!u64 {
read_count += 1;
return read_count;
}
const FormValue = union(enum) {
Address: u64,
Other: bool,
};
fn doThing(form_id: u64) error!FormValue {
return switch (form_id) {
17 => FormValue { .Address = try readOnce() },
else => error.InvalidDebugInfo,
};
}
test "switch prong returns error enum" {
switch (doThing(17) catch unreachable) {
FormValue.Address => |payload| { assert(payload == 1); },
else => unreachable,
}
assert(read_count == 1);
}