cgen: fix alias to struct ptr on structinit (#18571)

vlib/v/gen/c/auto_str_methods.v

@@ -259,7 +259,8 @@ fn (mut g Gen) gen_str_for_alias(info ast.Alias, styp string, str_fn_name string
 	if str_method_expects_ptr {
 		g.auto_str_funcs.writeln('\tstring tmp_ds = ${parent_str_fn_name}(&it);')
 	} else {
-		g.auto_str_funcs.writeln('\tstring tmp_ds = ${parent_str_fn_name}(it);')
+		deref, _ := deref_kind(str_method_expects_ptr, info.parent_type.is_ptr(), info.parent_type)
+		g.auto_str_funcs.writeln('\tstring tmp_ds = ${parent_str_fn_name}(${deref}it);')
 	}
 	g.auto_str_funcs.writeln('\tstring res = str_intp(3, _MOV((StrIntpData[]){
 		{_SLIT0, ${c.si_s_code}, {.d_s = indents }},

vlib/v/gen/c/struct.v

@@ -22,7 +22,7 @@ fn (mut g Gen) struct_init(node ast.StructInit) {
 		g.empty_line = false
 		g.write(s)
 	}
-	styp := g.typ(node.typ)
+	styp := g.typ(g.table.unaliased_type(node.typ)).replace('*', '')
 	mut shared_styp := '' // only needed for shared x := St{...
 	if styp in c.skip_struct_init {
 		// needed for c++ compilers
@@ -71,6 +71,10 @@ fn (mut g Gen) struct_init(node ast.StructInit) {
 			g.write('{')
 		}
 	} else {
+		// alias to pointer type
+		if g.table.sym(node.typ).kind == .alias && g.table.unaliased_type(node.typ).is_ptr() {
+			g.write('&')
+		}
 		if is_multiline {
 			g.writeln('(${styp}){')
 		} else {

vlib/v/tests/alias_to_ptr_arg_test.v

@@ -0,0 +1,16 @@
+struct Foo {
+	name string
+	age  int
+}
+
+type Boo = &Foo
+
+fn foo(f Boo) {
+	println(f)
+	dump(f)
+}
+
+fn test_main() {
+	foo(name: '')
+	assert true
+}