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v/vlib/compiler/tests/option_test.v

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fn opt_err() ?string {return error('hi')}
fn test_err(){
v := opt_err() or {
assert err == 'hi'
return
}
assert false
println(v) // suppress not used error
}
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fn err_call(ok bool) ?int {
if !ok {
return error('Not ok!')
}
return 42
}
fn ret_none() ?int {
//return error('wtf') //none
return none
}
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fn test_option_for_base_type_without_variable() {
val := err_call(true) or {
panic(err)
}
assert val == 42
println('hm')
val2 := ret_none() or {
println('yep')
return
}
println('$val2 should have been `none`')
assert false
// This is invalid:
// x := 5 or {
// return
// }
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}
fn test_if_opt() {
if val := err_call(false) {
assert val == 42
}
assert 1 == 1
println('nice')
}