type_resolver: clear option flag if present in comptime $for (fix #25761) (#25763)

Author: dy-tea

vlib/v/tests/comptime/comptime_for_in_options_struct_test.v

@@ -0,0 +1,27 @@
+struct Options {
+	a ?string
+	b ?int
+	c ?f64
+}
+
+fn unwrap_not_none_field_types[T](t T) []string {
+	mut arr := []string{}
+	$for f in T.fields {
+		v := t.$(f.name)
+		$if f is $option {
+			if v != none {
+				arr << typeof(v).name
+			}
+		}
+	}
+	return arr
+}
+
+fn test_main() {
+	arr := unwrap_not_none_field_types(Options{
+		a: 'x'
+		b: 1
+		c: 2.3
+	})
+	assert arr.join(' ') == 'string int f64'
+}

vlib/v/type_resolver/comptime_resolver.v

@@ -71,8 +71,21 @@ pub fn (t &ResolverInfo) is_comptime_variant_var(node ast.Ident) bool {
 
 // typeof_type resolves type for typeof() expr where field.typ is resolved to real type instead of int type to make type(field.typ).name working
 pub fn (mut t TypeResolver) typeof_type(node ast.Expr, default_type ast.Type) ast.Type {
+	if node is ast.Ident {
+		if t.info.inside_comptime_for && t.info.comptime_for_field_var != '' {
+			if node.obj is ast.Var {
+				obj_typ := node.obj.typ
+				field_typ := t.info.comptime_for_field_type
+				if (obj_typ.has_flag(.option) && field_typ.has_flag(.option))
+					|| (obj_typ.clear_flag(.option).idx() == field_typ.clear_flag(.option).idx()
+					&& obj_typ.has_flag(.option)) {
+					return field_typ.clear_flag(.option)
+				}
+			}
+		}
+	}
 	if t.info.is_comptime(node) {
-		return t.get_type(node)
+		return t.get_type(node).clear_flag(.option)
 	} else if node is ast.SelectorExpr && node.expr_type != 0 {
 		if node.expr is ast.Ident && node.is_field_typ {
 			return t.get_type_from_comptime_var(node.expr)