fix enum with const value declaration

src/c2v.v

@@ -894,32 +894,34 @@ fn (mut c C2V) enum_decl(mut node Node) {
 	for i, mut child in node.inner {
 		name := filter_name(child.name.to_lower())
 		vals << name
+		mut has_anon_generated := false
 		// empty enum means it's just a list of #define'ed consts
 		if enum_name == '' {
 			if !name.starts_with('_') && name !in c.consts {
 				c.consts << name
-				c.genln('\t${name} = ${i}')
+				c.gen('\t${name}')
+				has_anon_generated = true
 			}
 		} else {
 			c.gen('\t' + name)
-			// handle custom enum vals, e.g. `MF_SHOOTABLE = 4`
-			if child.inner.len > 0 {
-				mut const_expr := child.try_get_next_child() or {
+		}
+		// handle custom enum vals, e.g. `MF_SHOOTABLE = 4`
+		if child.inner.len > 0 {
+			mut const_expr := child.try_get_next_child() or {
+				println(err)
+				bad_node
+			}
+			if const_expr.kind == .constant_expr {
+				c.gen(' = ')
+				c.skip_parens = true
+				c.expr(const_expr.try_get_next_child() or {
 					println(err)
 					bad_node
-				}
-				if const_expr.kind == .constant_expr {
-					c.gen(' = ')
-					c.skip_parens = true
-					c.expr(const_expr.try_get_next_child() or {
-						println(err)
-						bad_node
-					})
-					c.skip_parens = false
-				}
-			} else {
-				c.genln('')
+				})
+				c.skip_parens = false
 			}
+		} else if has_anon_generated {
+			c.genln(' = ${i}')
 		}
 	}
 	if enum_name != '' {

tests/11.enum_default.c

@@ -0,0 +1,27 @@
+enum myEnum {
+    A,
+    B,
+    C
+};
+
+typedef enum {
+    D,
+    E,
+    F
+} myAnotherEnum;
+
+typedef enum myStrangeEnum {
+    G,
+    H,
+    I
+} myStrangeEnum;
+
+enum { J = 1 };
+
+int main() {
+    enum myEnum myEnumVar = A;
+    myAnotherEnum myEnumVar2 = D;
+    myStrangeEnum myEnumVar3 = G;
+    int myIntVar = J;
+    return 0;
+}

tests/11.enum_default.out

@@ -0,0 +1,32 @@
+[translated]
+module main
+
+enum MyEnum {
+	a
+	b
+	c
+}
+
+enum MyAnotherEnum {
+	d
+	e
+	f
+}
+
+enum MyStrangeEnum {
+	g
+	h
+	i
+}
+
+const ( // empty enum
+	j = 1
+)
+
+fn main() {
+	myenumvar := MyEnum.a
+	myenumvar2 := MyAnotherEnum.d
+	myenumvar3 := MyStrangeEnum.g
+	myintvar := j
+	return
+}