cgen: fix map exists bug (#7647) (#7655)

vlib/builtin/map_test.v

@@ -367,6 +367,17 @@ fn test_map_in_mut() {
 	assert m['one'] == 2
 }
 
+fn test_map_in() {
+	m := {
+		'Foo': 'bar'
+	}
+	if 'foo'.capitalize() in m {
+		println('ok')
+	} else {
+		assert false
+	}
+}
+
 fn mut_map_with_relation_op_in_fn(mut m map[string]int) {
 	if m['one'] == 1 {
 		m['three'] = 3

vlib/v/gen/cgen.v

@@ -3081,13 +3081,23 @@ fn (mut g Gen) infix_expr(node ast.InfixExpr) {
 			return
 		} else if right_sym.kind == .map {
 			g.write('_IN_MAP(')
+			if !node.left_type.is_ptr() {
+				left_type_str := g.table.type_to_str(node.left_type)
+				g.write('ADDR($left_type_str, ')
+				g.expr(node.left)
+				g.write(')')
+			} else {
 				g.expr(node.left)
-			g.write(', ')
-			if node.right_type.is_ptr() {
-				g.write('*')
 			}
+			g.write(', ')
+			if !node.right_type.is_ptr() {
+				g.write('ADDR(map, ')
 				g.expr(node.right)
 				g.write(')')
+			} else {
+				g.expr(node.right)
+			}
+			g.write(')')
 		} else if right_sym.kind == .string {
 			g.write('string_contains(')
 			g.expr(node.right)

vlib/v/gen/cheaders.v

@@ -272,7 +272,7 @@ static void* g_live_info = NULL;
 // take the address of an rvalue
 #define ADDR(type, expr) (&((type[]){expr}[0]))
 #define _PUSH_MANY(arr, val, tmp, tmp_typ) {tmp_typ tmp = (val); array_push_many(arr, tmp.data, tmp.len);}
-#define _IN_MAP(val, m) map_exists_1(&m, &val)
+#define _IN_MAP(val, m) map_exists_1(m, val)
 
 // unsigned/signed comparisons
 static inline bool _us32_gt(uint32_t a, int32_t b) { return a > INT32_MAX || (int32_t)a > b; }