checker: check nested struct field with required attr (fix #10913) (#17277)

vlib/clipboard/x11/clipboard.c.v

@@ -71,7 +71,7 @@ fn todo_del() {}
 [typedef]
 struct C.XSelectionRequestEvent {
 mut:
-	display   &C.Display // Display the event was read from
+	display   &C.Display = unsafe { nil } // Display the event was read from
 	owner     Window
 	requestor Window
 	selection Atom
@@ -84,7 +84,7 @@ mut:
 struct C.XSelectionEvent {
 mut:
 	@type     int
-	display   &C.Display // Display the event was read from
+	display   &C.Display = unsafe { nil } // Display the event was read from
 	requestor Window
 	selection Atom
 	target    Atom

vlib/net/http/header.v

@@ -6,7 +6,6 @@ module http
 import strings
 
 // Header represents the key-value pairs in an HTTP header
-[noinit]
 pub struct Header {
 mut:
 	data map[string][]string

vlib/v/checker/checker.v

@@ -2638,7 +2638,7 @@ pub fn (mut c Checker) expr(node_ ast.Expr) ast.Type {
 			if node.unresolved {
 				return c.expr(ast.resolve_init(node, c.unwrap_generic(node.typ), c.table))
 			}
-			return c.struct_init(mut node)
+			return c.struct_init(mut node, false)
 		}
 		ast.TypeNode {
 			if !c.inside_x_is_type && node.typ.has_flag(.generic) && unsafe { c.table.cur_fn != 0 }

vlib/v/checker/struct.v

@@ -254,7 +254,7 @@ fn minify_sort_fn(a &ast.StructField, b &ast.StructField) int {
 	}
 }
 
-fn (mut c Checker) struct_init(mut node ast.StructInit) ast.Type {
+fn (mut c Checker) struct_init(mut node ast.StructInit, is_field_zero_struct_init bool) ast.Type {
 	util.timing_start(@METHOD)
 	defer {
 		util.timing_measure_cumulative(@METHOD)
@@ -327,7 +327,9 @@ fn (mut c Checker) struct_init(mut node ast.StructInit) ast.Type {
 	if c.table.cur_fn != unsafe { nil } && c.table.cur_fn.generic_names.len > 0 {
 		c.table.unwrap_generic_type(node.typ, c.table.cur_fn.generic_names, c.table.cur_concrete_types)
 	}
+	if !is_field_zero_struct_init {
 		c.ensure_type_exists(node.typ, node.pos) or {}
+	}
 	type_sym := c.table.sym(node.typ)
 	if !c.inside_unsafe && type_sym.kind == .sum_type {
 		c.note('direct sum type init (`x := SumType{}`) will be removed soon', node.pos)
@@ -361,7 +363,7 @@ fn (mut c Checker) struct_init(mut node ast.StructInit) ast.Type {
 	// allow init structs from generic if they're private except the type is from builtin module
 	if !node.has_update_expr && !type_sym.is_pub && type_sym.kind != .placeholder
 		&& type_sym.language != .c && (type_sym.mod != c.mod && !(node.typ.has_flag(.generic)
-		&& type_sym.mod != 'builtin')) {
+		&& type_sym.mod != 'builtin')) && !is_field_zero_struct_init {
 		c.error('type `${type_sym.name}` is private', node.pos)
 	}
 	if type_sym.kind == .struct_ {
@@ -627,6 +629,14 @@ fn (mut c Checker) struct_init(mut node ast.StructInit) ast.Type {
 							node.pos)
 					}
 				}
+				if !field.has_default_expr && field.name !in inited_fields && !field.typ.is_ptr()
+					&& c.table.final_sym(field.typ).kind == .struct_ {
+					mut zero_struct_init := ast.StructInit{
+						pos: node.pos
+						typ: field.typ
+					}
+					c.struct_init(mut zero_struct_init, true)
+				}
 			}
 			// println('>> checked_types.len: $checked_types.len | checked_types: $checked_types | type_sym: $type_sym.name ')
 		}

vlib/v/checker/tests/nested_struct_with_required_attr_err.out

@@ -0,0 +1,7 @@
+vlib/v/checker/tests/nested_struct_with_required_attr_err.vv:13:7: error: field `Egg.name` must be initialized
+   11 |
+   12 | fn main() {
+   13 |     f := Foo{}
+      |          ~~~~~
+   14 |     println(f)
+   15 | }

vlib/v/checker/tests/nested_struct_with_required_attr_err.vv

@@ -0,0 +1,15 @@
+struct Foo {
+	bar Bar
+}
+struct Bar {
+	egg Egg
+}
+
+struct Egg {
+	name string [required]
+}
+
+fn main() {
+	f := Foo{}
+	println(f)
+}

vlib/v/checker/tests/struct_field_generic_struct_unknown_type_err.out

@@ -5,3 +5,9 @@ vlib/v/checker/tests/struct_field_generic_struct_unknown_type_err.vv:9:7: error:
       |       ~~~~~~~~~~~~~~~~~~
    10 | }
    11 |
+vlib/v/checker/tests/struct_field_generic_struct_unknown_type_err.vv:13:9: error: unknown type `UnknownType`
+   11 |
+   12 | fn main() {
+   13 |     _ = MyType {}
+      |         ~~~~~~~~~
+   14 | }

vlib/v/checker/tests/struct_field_reference_type_err.out

@@ -5,6 +5,13 @@ vlib/v/checker/tests/struct_field_reference_type_err.vv:12:16: warning: referenc
       |                   ~~~~~~~
    13 |         ageee: 20
    14 |     }
+vlib/v/checker/tests/struct_field_reference_type_err.vv:12:16: warning: reference field `Duck.age` must be initialized
+   10 |
+   11 | fn main() {
+   12 |     mut animal := Animal{
+      |                   ~~~~~~~
+   13 |         ageee: 20
+   14 |     }
 vlib/v/checker/tests/struct_field_reference_type_err.vv:17:3: error: reference field must be initialized with reference
    15 |
    16 |     animal.duck = Duck{

vlib/v/checker/tests/struct_ref_fields_uninitialized_err.out

@@ -5,6 +5,13 @@ vlib/v/checker/tests/struct_ref_fields_uninitialized_err.vv:25:7: warning: refer
       |          ~~~~~~~
    26 |     _ := Struct{}
    27 | }
+vlib/v/checker/tests/struct_ref_fields_uninitialized_err.vv:25:7: warning: reference field `ContainsRef.b` must be initialized
+   23 |
+   24 | fn main() {
+   25 |     _ := Outer{}
+      |          ~~~~~~~
+   26 |     _ := Struct{}
+   27 | }
 vlib/v/checker/tests/struct_ref_fields_uninitialized_err.vv:25:7: warning: reference field `Outer.c2.b` must be initialized (part of struct `ContainsRef`)
    23 |
    24 | fn main() {

vlib/vweb/csrf/csrf_test.v

@@ -21,7 +21,7 @@ fn (mut app App) index() vweb.Result {
 fn test_send_a_request_to_homepage_expecting_a_csrf_cookie() {
 	spawn vweb.run_at(&App{}, vweb.RunParams{ port: sport })
 	time.sleep(500 * time.millisecond)
-	res := http.get('http://localhost:${sport}/')?
+	res := http.get('http://localhost:${sport}/')!
 	if res.header.str().contains('__Host-Csrf-Token') {
 		assert true
 	} else {