v / vlib / v2 / tests / conditional_struct_field_test.vv2
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1// End-to-end test for v2's conditional struct field parsing.


2// Exercises `$if cond { ... }` / `$else $if` / `$else` blocks and the


3// per-field `@[if cond ?]` attribute. Compiled and run via the v2 binary.


4


5module main


6


7struct Container {


8    name string


9$if !no_log ? {


10    logger string = 'default'


11}


12    always int = 42


13$if my_feature ? {


14    feature_val string = 'on'


15} $else {


16    feature_val string = 'off'


17}


18    dev_menu    string = 'dev' @[if !no_dev_menu ?]


19    never_built string = 'nope' @[if absent_flag ?]


20}


21


22fn main() {


23    c := Container{


24        name: 'app'


25    }


26    assert c.name == 'app'


27    assert c.logger == 'default'


28    assert c.always == 42


29    // `my_feature` is not defined → `$else` branch contributes the field.


30    assert c.feature_val == 'off'


31    // `no_dev_menu` is not defined → `!no_dev_menu` is true → field kept.


32    assert c.dev_menu == 'dev'


33    println('conditional_struct_field_test PASS')


34}


35