From 03f27857f5066555691ffbb6b56708440de55ac0 Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Fri, 19 Jun 2026 22:32:28 +0300
Subject: [PATCH] cgen: fix `#line` directive glued to expression in array
 literal branches (#27495) (#27497)

---
 vlib/v/gen/c/array.v                          |  3 ++
 vlib/v/gen/c/ctempvars.v                      |  3 ++
 .../match_expr_array_literal_with_g_test.v    | 37 +++++++++++++++++++
 3 files changed, 43 insertions(+)
 create mode 100644 vlib/v/tests/match_expr_array_literal_with_g_test.v

diff --git a/vlib/v/gen/c/array.v b/vlib/v/gen/c/array.v
index 18b97adde..92d8a70b0 100644
--- a/vlib/v/gen/c/array.v
+++ b/vlib/v/gen/c/array.v
@@ -90,6 +90,9 @@ fn (mut g Gen) prepare_array_init_exprs(exprs []ast.Expr, expr_types []ast.Type,
 		g.write(' ')
 	} else {
 		g.write(stmt_str)
+		if g.pref.is_vlines && stmt_str.contains('#line') {
+			g.writeln('')
+		}
 	}
 	return prepared
 }
diff --git a/vlib/v/gen/c/ctempvars.v b/vlib/v/gen/c/ctempvars.v
index 77347880d..6538e40f8 100644
--- a/vlib/v/gen/c/ctempvars.v
+++ b/vlib/v/gen/c/ctempvars.v
@@ -30,6 +30,9 @@ fn (mut g Gen) expr_to_ctemp_before_stmt(expr ast.Expr, expr_type ast.Type) ast.
 	mut x := g.new_ctemp_var(expr, expr_type)
 	g.gen_ctemp_var(mut x)
 	g.write(stmt_str)
+	if g.pref.is_vlines && stmt_str.contains('#line') {
+		g.writeln('')
+	}
 	return x
 }
 
diff --git a/vlib/v/tests/match_expr_array_literal_with_g_test.v b/vlib/v/tests/match_expr_array_literal_with_g_test.v
new file mode 100644
index 000000000..3cf91f93e
--- /dev/null
+++ b/vlib/v/tests/match_expr_array_literal_with_g_test.v
@@ -0,0 +1,37 @@
+import os
+
+const vexe = @VEXE
+
+fn test_match_expr_array_literal_compiles_with_g() {
+	test_dir := os.join_path(os.vtmp_dir(), 'match_expr_array_g_test_${os.getpid()}')
+	os.mkdir_all(test_dir)!
+	defer {
+		os.rmdir_all(test_dir) or {}
+	}
+	source := os.join_path(test_dir, 'test.v')
+	out_c := os.join_path(test_dir, 'test.c')
+	os.write_file(source, "import os
+
+fn pick() []string {
+	home := os.home_dir()
+	return match os.user_os() {
+		'windows' {
+			[os.join_path(os.getenv('LOCALAPPDATA'), 'a'), os.join_path(home, 'b')]
+		}
+		else {
+			[]string{}
+		}
+	}
+}
+
+fn main() {
+	println(pick())
+}
+")!
+	res :=
+		os.execute('${os.quoted_path(vexe)} -g -o ${os.quoted_path(out_c)} -b c ${os.quoted_path(source)}')
+	assert res.exit_code == 0, res.output
+	generated := os.read_file(out_c)!
+	// Ensure no #line directive is glued to the following expression (missing newline).
+	assert !generated.contains('"builtin__new_array'), 'found #line directive glued to expression'
+}
-- 
2.39.5