From d07fc55ef1e9ee0936afc1babb29ef2b36c2af38 Mon Sep 17 00:00:00 2001
From: yuyi <yuyi98@163.com>
Date: Wed, 24 Jul 2024 15:02:18 +0800
Subject: [PATCH] checker: check enum field value duplicate

---
 vlib/v/checker/checker.v                            |  8 ++++++++
 .../checker/tests/enum_field_value_duplicate_d.out  |  7 +++++++
 .../v/checker/tests/enum_field_value_duplicate_d.vv | 13 +++++++++++++
 3 files changed, 28 insertions(+)
 create mode 100644 vlib/v/checker/tests/enum_field_value_duplicate_d.out
 create mode 100644 vlib/v/checker/tests/enum_field_value_duplicate_d.vv

diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index 303d79a6491e3b..57c7b789f2019f 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -1951,6 +1951,14 @@ fn (mut c Checker) enum_decl(mut node ast.EnumDecl) {
 						}
 						if field.expr.kind == .constant && field.expr.obj.typ.is_int() {
 							// accepts int constants as enum value
+							if mut field.expr.obj is ast.ConstField {
+								if mut field.expr.obj.expr is ast.IntegerLiteral {
+									c.check_enum_field_integer_literal(field.expr.obj.expr,
+										signed, node.is_multi_allowed, senum_type, field.expr.pos, mut
+										useen, enum_umin, enum_umax, mut iseen, enum_imin,
+										enum_imax)
+								}
+							}
 							continue
 						}
 					}
diff --git a/vlib/v/checker/tests/enum_field_value_duplicate_d.out b/vlib/v/checker/tests/enum_field_value_duplicate_d.out
new file mode 100644
index 00000000000000..b4350c326e08a8
--- /dev/null
+++ b/vlib/v/checker/tests/enum_field_value_duplicate_d.out
@@ -0,0 +1,7 @@
+vlib/v/checker/tests/enum_field_value_duplicate_d.vv:6:6: error: enum value `1` already exists
+    4 |     a = one
+    5 |     b
+    6 |     c = one
+      |         ~~~
+    7 | }
+    8 |
diff --git a/vlib/v/checker/tests/enum_field_value_duplicate_d.vv b/vlib/v/checker/tests/enum_field_value_duplicate_d.vv
new file mode 100644
index 00000000000000..249ba9aa7d4ca5
--- /dev/null
+++ b/vlib/v/checker/tests/enum_field_value_duplicate_d.vv
@@ -0,0 +1,13 @@
+const one = 1
+
+enum MyEnum {
+	a = one
+	b
+	c = one
+}
+
+fn main() {
+	$for val in MyEnum.values {
+		println('> name: ${val.name} | value: ${val.value}')
+	}
+}