From d97dd3f04d32d73c64562ed5a4735951dce083d7 Mon Sep 17 00:00:00 2001
From: yuyi98 <yuyi98@163.com>
Date: Sun, 27 Mar 2022 22:58:13 +0800
Subject: [PATCH] cgen: fix crash for casting bool to int

---
 vlib/v/gen/c/cgen.v                  | 12 ++++++++++++
 vlib/v/tests/cast_bool_to_int_test.v | 12 ++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 vlib/v/tests/cast_bool_to_int_test.v

diff --git a/vlib/v/gen/c/cgen.v b/vlib/v/gen/c/cgen.v
index b10df0b4a8..adeb3e0b23 100644
--- a/vlib/v/gen/c/cgen.v
+++ b/vlib/v/gen/c/cgen.v
@@ -3771,6 +3771,18 @@ fn (mut g Gen) cast_expr(node ast.CastExpr) {
 		g.write('))')
 	} else if sym.kind == .alias && g.table.final_sym(node.typ).kind == .array_fixed {
 		g.expr(node.expr)
+	} else if node.expr_type != 0 && g.table.final_sym(node.expr_type).kind == .bool
+		&& node.typ.is_int() {
+		styp := g.typ(node.typ)
+		tmp := g.new_tmp_var()
+		g.empty_line = true
+		s := g.go_before_stmt(0)
+		g.write('$styp $tmp = (')
+		g.expr(node.expr)
+		g.writeln(')?1:0;')
+		g.empty_line = false
+		g.write(s)
+		g.write(tmp)
 	} else {
 		styp := g.typ(node.typ)
 		if (g.pref.translated || g.file.is_translated) && sym.kind == .function {
diff --git a/vlib/v/tests/cast_bool_to_int_test.v b/vlib/v/tests/cast_bool_to_int_test.v
new file mode 100644
index 0000000000..2158366fdd
--- /dev/null
+++ b/vlib/v/tests/cast_bool_to_int_test.v
@@ -0,0 +1,12 @@
+module main
+
+fn test_cast_bool_to_int() {
+	i := true
+	a := [1, 2, 3]
+
+	println(a[int(!i)])
+	assert a[int(!i)] == 1
+
+	println(a[int(i)])
+	assert a[int(i)] == 2
+}