From 7c89d77d5b79d32c4a946d472a84822d056354ff Mon Sep 17 00:00:00 2001
From: Felipe Pena <felipensp@gmail.com>
Date: Thu, 2 May 2024 02:59:15 -0300
Subject: [PATCH] parser: add check for result type on chan init (#21363)

---
 vlib/v/checker/tests/result_chan_test_err.out | 6 ++++++
 vlib/v/checker/tests/result_chan_test_err.vv  | 4 ++++
 vlib/v/parser/parser.v                        | 3 +++
 3 files changed, 13 insertions(+)
 create mode 100644 vlib/v/checker/tests/result_chan_test_err.out
 create mode 100644 vlib/v/checker/tests/result_chan_test_err.vv

diff --git a/vlib/v/checker/tests/result_chan_test_err.out b/vlib/v/checker/tests/result_chan_test_err.out
new file mode 100644
index 000000000..0a5b9860a
--- /dev/null
+++ b/vlib/v/checker/tests/result_chan_test_err.out
@@ -0,0 +1,6 @@
+vlib/v/checker/tests/result_chan_test_err.vv:2:12: error: cannot use chan with Result type
+    1 | fn main() {
+    2 |     c := chan !string{}
+      |               ^
+    3 |     println(c.len)
+    4 | }
diff --git a/vlib/v/checker/tests/result_chan_test_err.vv b/vlib/v/checker/tests/result_chan_test_err.vv
new file mode 100644
index 000000000..a9753191f
--- /dev/null
+++ b/vlib/v/checker/tests/result_chan_test_err.vv
@@ -0,0 +1,4 @@
+fn main() {
+	c := chan !string{}
+	println(c.len)
+}
\ No newline at end of file
diff --git a/vlib/v/parser/parser.v b/vlib/v/parser/parser.v
index e113b0fd0..86e9b91f3 100644
--- a/vlib/v/parser/parser.v
+++ b/vlib/v/parser/parser.v
@@ -2654,6 +2654,9 @@ fn (mut p Parser) name_expr() ast.Expr {
 		first_pos := p.tok.pos()
 		mut last_pos := first_pos
 		mut elem_type_pos := p.peek_tok.pos()
+		if p.peek_tok.kind == .not {
+			return p.error_with_pos('cannot use chan with Result type', p.peek_tok.pos())
+		}
 		chan_type := p.parse_chan_type()
 		elem_type_pos = elem_type_pos.extend(p.prev_tok.pos())
 		mut has_cap := false
-- 
2.39.5