From 4bc9a8f8d8951edcb698dab4e4dd6dc86a3cebe7 Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@vlang.io>
Date: Sun, 15 Oct 2023 16:18:00 +0300
Subject: [PATCH] checker: fix C.xx = C.yy aliases

---
 vlib/builtin/builtin_windows.c.v | 18 ++++++++----------
 vlib/v/checker/checker.v         |  2 +-
 2 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/vlib/builtin/builtin_windows.c.v b/vlib/builtin/builtin_windows.c.v
index 0f0cd8165d..6f38acc72b 100644
--- a/vlib/builtin/builtin_windows.c.v
+++ b/vlib/builtin/builtin_windows.c.v
@@ -9,23 +9,21 @@ __global g_original_codepage = u32(0)
 
 pub type C.BOOL = bool
 
-pub struct C.HINSTANCE {}
+pub type C.HINSTANCE = voidptr
 
-pub struct C.HICON {}
+pub type C.HICON = voidptr
 
-pub struct C.HCURSOR {}
+pub type C.HCURSOR = voidptr
 
-pub struct C.HCURSOR {}
+pub type C.HBRUSH = voidptr
 
-pub struct C.HBRUSH {}
+pub type C.HWND = voidptr
 
-pub struct C.HWND {}
+pub type C.HGLOBAL = voidptr
 
-pub struct C.HGLOBAL {}
+pub type C.HANDLE = voidptr
 
-pub struct C.HANDLE {}
-
-pub struct C.LRESULT {}
+pub type C.LRESULT = voidptr
 
 // utf8 to stdout needs C.SetConsoleOutputCP(cp_utf8)
 fn C.GetConsoleOutputCP() u32
diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index c8468a927e..65017d922b 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -499,7 +499,7 @@ fn (mut c Checker) type_decl(node ast.TypeDecl) {
 }
 
 fn (mut c Checker) alias_type_decl(node ast.AliasTypeDecl) {
-	if c.file.mod.name != 'builtin' && c.file.mod.name != 'time' {
+	if c.file.mod.name != 'builtin' && !node.name.starts_with('C.') {
 		c.check_valid_pascal_case(node.name, 'type alias', node.pos)
 	}
 	if !c.ensure_type_exists(node.parent_type, node.type_pos) {