From b9a1f1426b2cb1ab76aeaaf515b790ecb64391f3 Mon Sep 17 00:00:00 2001
From: Felipe Pena <felipensp@gmail.com>
Date: Mon, 4 Nov 2024 20:02:37 -0300
Subject: [PATCH 1/3] fix

---
 vlib/v/gen/c/infix.v | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/vlib/v/gen/c/infix.v b/vlib/v/gen/c/infix.v
index 13334cc67e4a31..b79847167f29fd 100644
--- a/vlib/v/gen/c/infix.v
+++ b/vlib/v/gen/c/infix.v
@@ -657,6 +657,7 @@ fn (mut g Gen) infix_expr_in_op(node ast.InfixExpr) {
 // and transform them in a series of equality comparison
 // i.e. `a in [1,2,3]` => `a == 1 || a == 2 || a == 3`
 fn (mut g Gen) infix_expr_in_optimization(left ast.Expr, left_type ast.Type, right ast.ArrayInit) {
+	tmp_var := if left is ast.CallExpr { g.new_tmp_var() } else { '' }
 	mut elem_sym := g.table.sym(right.elem_type)
 	left_parent_idx := g.table.sym(left_type).parent_idx
 	for i, array_expr in right.exprs {
@@ -719,13 +720,39 @@ fn (mut g Gen) infix_expr_in_optimization(left ast.Expr, left_type ast.Type, rig
 						g.write('${ptr_typ}_struct_eq(')
 					}
 				}
-				g.expr(left)
+				if left is ast.CallExpr {
+					if i == 0 {
+						line := g.go_before_last_stmt().trim_space()
+						g.empty_line = true
+						g.write('${g.styp(left.return_type)} ${tmp_var} = ')
+						g.expr(left)
+						g.writeln(';')
+						g.write2(line, tmp_var)
+					} else {
+						g.write(tmp_var)
+					}
+				} else {
+					g.expr(left)
+				}
 				g.write(', ')
 				g.expr(array_expr)
 				g.write(')')
 			}
 			else { // works in function kind
-				g.expr(left)
+				if left is ast.CallExpr {
+					if i == 0 {
+						line := g.go_before_last_stmt().trim_space()
+						g.empty_line = true
+						g.write('${g.styp(left.return_type)} ${tmp_var} = ')
+						g.expr(left)
+						g.writeln(';')
+						g.write2(line, tmp_var)
+					} else {
+						g.write(tmp_var)
+					}
+				} else {
+					g.expr(left)
+				}
 				g.write(' == ')
 				g.expr(array_expr)
 			}

From 6dc930946201616eb854ef28553ab7735ac4e084 Mon Sep 17 00:00:00 2001
From: Felipe Pena <felipensp@gmail.com>
Date: Mon, 4 Nov 2024 20:02:56 -0300
Subject: [PATCH 2/3] test

---
 vlib/v/slow_tests/inout/in_expr_callexpr.out |  4 ++++
 vlib/v/slow_tests/inout/in_expr_callexpr.vv  | 14 ++++++++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 vlib/v/slow_tests/inout/in_expr_callexpr.out
 create mode 100644 vlib/v/slow_tests/inout/in_expr_callexpr.vv

diff --git a/vlib/v/slow_tests/inout/in_expr_callexpr.out b/vlib/v/slow_tests/inout/in_expr_callexpr.out
new file mode 100644
index 00000000000000..8e9950d1ab9fb0
--- /dev/null
+++ b/vlib/v/slow_tests/inout/in_expr_callexpr.out
@@ -0,0 +1,4 @@
+t
+true
+t2
+true
diff --git a/vlib/v/slow_tests/inout/in_expr_callexpr.vv b/vlib/v/slow_tests/inout/in_expr_callexpr.vv
new file mode 100644
index 00000000000000..ce2e227218e5a1
--- /dev/null
+++ b/vlib/v/slow_tests/inout/in_expr_callexpr.vv
@@ -0,0 +1,14 @@
+fn t() bool {
+	println('${@FN}')
+	return true
+}
+
+fn t2() int {
+	println('${@FN}')
+	return 2
+}
+
+fn main() {
+	println(t() in [false, true])
+	println(t2() in [0, 1, 2, 3, 4, 5])
+}

From 45bef6dc8bffffab7189756c5edcbd49304ac1b2 Mon Sep 17 00:00:00 2001
From: Felipe Pena <felipensp@gmail.com>
Date: Tue, 5 Nov 2024 09:27:24 -0300
Subject: [PATCH 3/3] fix test

---
 vlib/v/slow_tests/inout/in_expr_callexpr.vv | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/vlib/v/slow_tests/inout/in_expr_callexpr.vv b/vlib/v/slow_tests/inout/in_expr_callexpr.vv
index ce2e227218e5a1..b64c098d32402e 100644
--- a/vlib/v/slow_tests/inout/in_expr_callexpr.vv
+++ b/vlib/v/slow_tests/inout/in_expr_callexpr.vv
@@ -1,10 +1,10 @@
 fn t() bool {
-	println('${@FN}')
+	println(@FN)
 	return true
 }
 
 fn t2() int {
-	println('${@FN}')
+	println(@FN)
 	return 2
 }