cgen: fix shared map delete (#15431)

vlib/v/gen/c/fn.v

@@ -827,24 +827,40 @@ fn (mut g Gen) method_call(node ast.CallExpr) {
 		left_info := left_sym.info as ast.Map
 		elem_type_str := g.typ(left_info.key_type)
 		g.write('map_delete(')
+		if left_type.has_flag(.shared_f) {
+			if left_type.is_ptr() {
+				g.write('&')
+			}
+			g.expr(node.left)
+			g.write('->val')
+		} else {
 			if left_type.is_ptr() {
 				g.expr(node.left)
 			} else {
 				g.write('&')
 				g.expr(node.left)
 			}
+		}
 		g.write(', &($elem_type_str[]){')
 		g.expr(node.args[0].expr)
 		g.write('})')
 		return
 	} else if left_sym.kind == .array && node.name == 'delete' {
 		g.write('array_delete(')
+		if left_type.has_flag(.shared_f) {
+			if left_type.is_ptr() {
+				g.write('&')
+			}
+			g.expr(node.left)
+			g.write('->val')
+		} else {
 			if left_type.is_ptr() {
 				g.expr(node.left)
 			} else {
 				g.write('&')
 				g.expr(node.left)
 			}
+		}
 		g.write(', ')
 		g.expr(node.args[0].expr)
 		g.write(')')

vlib/v/tests/shared_map_delete_test.v

@@ -0,0 +1,14 @@
+fn test_shared_map_delete() {
+	shared store := map[string]int{}
+	lock store {
+		store['abc'] = 5
+		store['xyz'] = 10
+	}
+
+	lock store {
+		assert store.len == 2
+		store.delete('abc')
+		assert store.len == 1
+		assert store['xyz'] == 10
+	}
+}