From abe97b636b16b37eb996bfd45c8b6a28d157b2cf Mon Sep 17 00:00:00 2001
From: Felipe Pena <felipensp@gmail.com>
Date: Wed, 31 Dec 2025 09:53:17 -0300
Subject: [PATCH] checker: allow for `_` being used as both `import x as _` and
 `fn f(_ int) {` (fix (#26219) #26230

---
 vlib/v/checker/checker.v                      | 3 +++
 vlib/v/checker/tests/discard_import_usage.out | 0
 vlib/v/checker/tests/discard_import_usage.vv  | 7 +++++++
 3 files changed, 10 insertions(+)
 create mode 100644 vlib/v/checker/tests/discard_import_usage.out
 create mode 100644 vlib/v/checker/tests/discard_import_usage.vv

diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index 2d2bc4533..8c79c5c67 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -6073,6 +6073,9 @@ fn (mut c Checker) deprecate_old_isreftype_and_sizeof_of_a_guessed_type(is_guess
 }
 
 fn (c &Checker) check_import_sym_conflict(ident string) bool {
+	if ident == '_' {
+		return false
+	}
 	for import_sym in c.file.imports {
 		// Check if alias exists or not
 		if !import_sym.alias.is_blank() {
diff --git a/vlib/v/checker/tests/discard_import_usage.out b/vlib/v/checker/tests/discard_import_usage.out
new file mode 100644
index 000000000..e69de29bb
diff --git a/vlib/v/checker/tests/discard_import_usage.vv b/vlib/v/checker/tests/discard_import_usage.vv
new file mode 100644
index 000000000..ede0ffe00
--- /dev/null
+++ b/vlib/v/checker/tests/discard_import_usage.vv
@@ -0,0 +1,7 @@
+import os as _
+
+fn test_fn(_ int) {}
+
+fn main() {
+	test_fn(12)
+}
-- 
2.39.5