From 05e7d10bc19c48abaf97a4fc7bf72aeb946697ee Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Wed, 25 Mar 2026 16:42:18 +0300
Subject: [PATCH] checker: fix select chan timeout (fixes #15269)

---
 vlib/v/checker/checker.v                         | 4 ++--
 vlib/v/tests/concurrency/select_auto_sync_test.v | 9 +++++++++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index 4b617d5d7..6e5eccb16 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -6215,8 +6215,8 @@ fn (mut c Checker) select_expr(mut node ast.SelectExpr) ast.Type {
 		match mut branch.stmt {
 			ast.ExprStmt {
 				if branch.is_timeout {
-					if !branch.stmt.typ.is_int() {
-						tsym := c.table.sym(branch.stmt.typ)
+					tsym := c.table.final_sym(c.unwrap_generic(branch.stmt.typ))
+					if !tsym.is_int() {
 						c.error('invalid type `${tsym.name}` for timeout - expected integer number of nanoseconds aka `time.Duration`',
 							branch.stmt.pos)
 					}
diff --git a/vlib/v/tests/concurrency/select_auto_sync_test.v b/vlib/v/tests/concurrency/select_auto_sync_test.v
index 10aa5f4ea..8c155336d 100644
--- a/vlib/v/tests/concurrency/select_auto_sync_test.v
+++ b/vlib/v/tests/concurrency/select_auto_sync_test.v
@@ -6,3 +6,12 @@ fn test_main() {
 	}
 	assert true
 }
+
+fn test_select_accepts_duration_timeout() {
+	v := chan int{}
+	select {
+		_ := <-v {}
+		time.millisecond {}
+	}
+	assert true
+}
-- 
2.39.5