From 7ee7932f5e1be2c969110fc20210a04ba195014f Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@vlang.io>
Date: Fri, 8 Jul 2022 21:09:02 +0300
Subject: [PATCH] anon expr

---
 vlib/v/checker/struct.v    | 9 +++++++--
 vlib/v/parser/expr.v       | 5 +++++
 vlib/v/tests/struct_test.v | 5 +++--
 3 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/vlib/v/checker/struct.v b/vlib/v/checker/struct.v
index 260b1fe733..d8b3877c02 100644
--- a/vlib/v/checker/struct.v
+++ b/vlib/v/checker/struct.v
@@ -267,8 +267,13 @@ pub fn (mut c Checker) struct_init(mut node ast.StructInit) ast.Type {
 		&& c.table.cur_concrete_types.len == 0 {
 		pos := type_sym.name.last_index('.') or { -1 }
 		first_letter := type_sym.name[pos + 1]
-		if !first_letter.is_capital() && type_sym.kind != .placeholder {
-			c.error('cannot initialize builtin type `$type_sym.name`', node.pos)
+		if !first_letter.is_capital() && type_sym.kind != .placeholder
+			&& !type_sym.name.starts_with('_VAnonStruct') {
+			s := type_sym.name
+			x := s.starts_with('_')
+
+			c.error('cannot initialize builtin type1 $x  "$s" "${s[..4]}" `$type_sym.name`',
+				node.pos)
 		}
 	}
 	if type_sym.kind == .sum_type && node.fields.len == 1 {
diff --git a/vlib/v/parser/expr.v b/vlib/v/parser/expr.v
index c4aaa0b2ff..d174c247e4 100644
--- a/vlib/v/parser/expr.v
+++ b/vlib/v/parser/expr.v
@@ -325,6 +325,11 @@ pub fn (mut p Parser) check_expr(precedence int) ?ast.Expr {
 			node = p.map_init()
 			p.check(.rcbr)
 		}
+		.key_struct {
+			// Anonymous struct
+			p.next()
+			return p.struct_init('', false)
+		}
 		.key_fn {
 			if p.expecting_type {
 				// Anonymous function type
diff --git a/vlib/v/tests/struct_test.v b/vlib/v/tests/struct_test.v
index d73abf40fa..f8eee4fe28 100644
--- a/vlib/v/tests/struct_test.v
+++ b/vlib/v/tests/struct_test.v
@@ -425,9 +425,10 @@ struct Book {
 }
 
 fn test_anon() {
-	empty_book := Book{} // author:struct{'sdf', 23}}
+	empty_book := Book{}
 	assert empty_book.author.age == 0
 	assert empty_book.author.name == ''
-
 	println(empty_book.author.age)
+
+	book := Book{ author:struct{'sdf', 23}}
 }